d and f Block Elements · Chemistry · JEE Main

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MCQ (Single Correct Answer)

JEE Main 2024 (Online) 1st February Evening Shift
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : In aqueous solutions $\math...
JEE Main 2024 (Online) 31st January Evening Shift
Choose the correct statements from the following A. $$\mathrm{Mn}_2 \mathrm{O}_7$$ is an oil at room temperature B. $$\mathrm{V}_2 \mathrm{O}_4$$ reac...
JEE Main 2024 (Online) 31st January Morning Shift
Identify correct statements from below: A. The chromate ion is square planar. B. Dichromates are generally prepared from chromates. C. The green manga...
JEE Main 2024 (Online) 31st January Morning Shift
The metals that are employed in the battery industries are A. $$\mathrm{Fe}$$ B. $$\mathrm{Mn}$$ C. $$\mathrm{Ni}$$ D. $$\mathrm{Cr}$$ E. $$\mathrm{Cd...
JEE Main 2024 (Online) 30th January Evening Shift
The orange colour of $$\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$$ and purple colour of $$\mathrm{KMnO}_4$$ is due to
JEE Main 2024 (Online) 30th January Morning Shift
Diamagnetic Lanthanoid ions are :
JEE Main 2024 (Online) 29th January Evening Shift
Which of the following acts as a strong reducing agent? (Atomic number: $$\mathrm{Ce}=58, \mathrm{Eu}=63, \mathrm{Gd}=64, \mathrm{Lu}=71$$)
JEE Main 2024 (Online) 29th January Evening Shift
Which of the following statements are correct about $$\mathrm{Zn}, \mathrm{Cd}$$ and $$\mathrm{Hg}$$ ? A. They exhibit high enthalpy of atomization as...
JEE Main 2024 (Online) 29th January Evening Shift
The correct IUPAC name of $$\mathrm{K}_2 \mathrm{MnO}_4$$ is
JEE Main 2024 (Online) 29th January Morning Shift
$$\mathrm{KMnO}_4$$ decomposes on heating at $$513 \mathrm{~K}$$ to form $$\mathrm{O}_2$$ along with
JEE Main 2024 (Online) 27th January Evening Shift
Given below are two statements : Statement (I) : In the Lanthanoids, the formation $$\mathrm{Ce}^{+4}$$ is favoured by its noble gas configuration. St...
JEE Main 2024 (Online) 27th January Evening Shift
Choose the correct option having all the elements with $$\mathrm{d}^{10}$$ electronic configuration from the following :
JEE Main 2024 (Online) 27th January Morning Shift
Which of the following electronic configuration would be associated with the highest magnetic moment?
JEE Main 2024 (Online) 27th January Morning Shift
$$\mathrm{NaCl}$$ reacts with conc. $$\mathrm{H}_2 \mathrm{SO}_4$$ and $$\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$$ to give reddish fumes (B), which re...
JEE Main 2024 (Online) 27th January Morning Shift
The electronic configuration for Neodymium is: [Atomic Number for Neodymium 60]
JEE Main 2023 (Online) 13th April Morning Shift
The pair of lanthanides in which both elements have high third - ionization energy is :
JEE Main 2023 (Online) 12th April Morning Shift
Given below are two statement: one is labelled as Assertion $$\mathbf{A}$$ and the other is labelled as Reason $$\mathbf{R}$$ Assertion A: $$5 \mathrm...
JEE Main 2023 (Online) 10th April Morning Shift
Prolonged heating is avoided during the preparation of ferrous ammonium sulphate to :
JEE Main 2023 (Online) 10th April Morning Shift
Which of the following statements are correct? (A) The M$$^{3+}$$/M$$^{2+}$$ reduction potential for iron is greater than manganese. (B) The higher ox...
JEE Main 2023 (Online) 8th April Morning Shift
Which halogen is known to cause the reaction given below : $$2 \mathrm{Cu}^{2+}+4 \mathrm{X}^{-} \rightarrow \mathrm{Cu}_{2} \mathrm{X}_{2}(\mathrm{s}...
JEE Main 2023 (Online) 8th April Morning Shift
In chromyl chloride, the number of d-electrons present on chromium is same as in (Given at no. of $$\mathrm{Ti}: 22, \mathrm{~V}: 23, \mathrm{Cr}: 24,...
JEE Main 2023 (Online) 6th April Evening Shift
Element not present in Nessler's reagent is :
JEE Main 2023 (Online) 6th April Evening Shift
Given below are two statements: one is labelled as "Assertion A" and the other is labelled as "Reason R" Assertion A : In the complex $$\mathrm{Ni}(\...
JEE Main 2023 (Online) 6th April Evening Shift
During the reaction of permanganate with thiosulphate, the change in oxidation of manganese occurs by value of 3. Identify which of the below medium w...
JEE Main 2023 (Online) 6th April Morning Shift
Strong reducing and oxidizing agents among the following, respectively, are :
JEE Main 2023 (Online) 1st February Evening Shift
Which element is not present in Nessler's reagent?
JEE Main 2023 (Online) 1st February Evening Shift
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : $$\mathrm{Cu^{2+}}$$ in wat...
JEE Main 2023 (Online) 1st February Morning Shift
Highest oxidation state of Mn is exhibited in $$\mathrm{Mn_2O_7}$$. The correct statements about $$\mathrm{Mn_2O_7}$$ are (A) Mn is tetrahedrally surr...
JEE Main 2023 (Online) 31st January Morning Shift
When $$\mathrm{Cu}^{2+}$$ ion is treated with $$\mathrm{KI}$$, a white precipitate, $$\mathrm{X}$$ appears in solution. The solution is titrated with ...
JEE Main 2023 (Online) 31st January Morning Shift
$$\mathrm{Nd^{2+}}$$ = __________
JEE Main 2023 (Online) 31st January Morning Shift
The correct order of basicity of oxides of vanadium is :
JEE Main 2023 (Online) 30th January Evening Shift
Formulae for Nessler's reagent is :
JEE Main 2023 (Online) 30th January Evening Shift
$\mathrm{KMnO}_4$ oxidises $\mathrm{I}^{-}$ in acidic and neutral/faintly alkaline solutions, respectively, to :
JEE Main 2023 (Online) 30th January Morning Shift
During the qualitative analysis of $$\mathrm{SO}_{3}^{2-}$$ using dilute $$\mathrm{H}_{2} \mathrm{SO}_{4}, \mathrm{SO}_{2}$$ gas is evolved which turn...
JEE Main 2023 (Online) 29th January Evening Shift
Given below are two statements : Statement I : Nickel is being used as the catalyst for producing syn gas and edible fats. Statement II : Silicon form...
JEE Main 2023 (Online) 29th January Evening Shift
The set of correct statements is : (i) Manganese exhibits +7 oxidation state in its oxide. (ii) Ruthenium and Osmium exhibit +8 oxidation in their oxi...
JEE Main 2023 (Online) 29th January Evening Shift
An indicator 'X' is used for studying the effect of variation in concentration of iodide on the rate of reaction of iodide ion with $$\mathrm{H_2O_2}$...
JEE Main 2023 (Online) 25th January Evening Shift
A chloride salt solution acidified with dil.HNO$$_3$$ gives a curdy white precipitate, [A], on addition of AgNO$$_3$$. [A] on treatment with NH$$_4$$O...
JEE Main 2023 (Online) 24th January Evening Shift
Which one amongst the following are good oxidizing agents? A. Sm$$^{2+}$$ B. Ce$$^{2+}$$ C. Ce$$^{4+}$$ D. Tb$$^{4+}$$ Choose the most appropriate ans...
JEE Main 2023 (Online) 24th January Morning Shift
An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime. The metal ion is :
JEE Main 2022 (Online) 29th July Evening Shift
Which of the following $$3\mathrm{d}$$-metal ion will give the lowest enthalpy of hydration $$\left(\Delta_{\text {hyd }} \mathrm{H}\right)$$ when dis...
JEE Main 2022 (Online) 29th July Morning Shift
The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives :
JEE Main 2022 (Online) 29th July Morning Shift
In following pairs, the one in which both transition metal ions are colourless is :
JEE Main 2022 (Online) 29th July Morning Shift
In neutral or faintly alkaline medium, $$\mathrm{KMnO}_{4}$$ being a powerful oxidant can oxidize, thiosulphate almost quantitatively, to sulphate. In...
JEE Main 2022 (Online) 28th July Morning Shift
Match List - I with List - II, match the gas evolved during each reaction. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:blac...
JEE Main 2022 (Online) 28th July Morning Shift
Which of the following has least tendency to liberate $$\mathrm{H}_{2}$$ from mineral acids?
JEE Main 2022 (Online) 27th July Evening Shift
In neutral or alkaline solution, $$\mathrm{MnO}_{4}^{-}$$ oxidises thiosulphate to :
JEE Main 2022 (Online) 27th July Morning Shift
Given below are two statements. Statement I : Iron (III) catalyst, acidified $$\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$$ and neutral $$\mathrm{K...
JEE Main 2022 (Online) 27th July Morning Shift
The total number of $$\mathrm{Mn}=\mathrm{O}$$ bonds in $$\mathrm{Mn}_{2} \mathrm{O}_{7}$$ is __________.
JEE Main 2022 (Online) 26th July Morning Shift
The dark purple colour of $$\mathrm{KMnO}_{4}$$ disappears in the titration with oxalic acid in acidic medium. The overall change in the oxidation num...
JEE Main 2022 (Online) 29th June Morning Shift
The electronic configuration of Pt (atomic number 78) is :
JEE Main 2022 (Online) 28th June Morning Shift
Which one of the lanthanoids given below is the most stable in divalent form?
JEE Main 2022 (Online) 27th June Evening Shift
The 'f' orbitals are half and completely filled, respectively in lanthanide ions : [Given : Atomic no. Eu, 63; Sm, 62; Tm, 69; Tb, 65; Yb, 70; Dy, 66]...
JEE Main 2022 (Online) 26th June Evening Shift
The most common oxidation state of Lanthanoid elements is +3. Which of the following is likely to deviate easily from +3 oxidation state?
JEE Main 2022 (Online) 25th June Evening Shift
The metal ion (in gaseous state) with lowest spin-only magnetic moment value is :
JEE Main 2022 (Online) 25th June Morning Shift
Cerium (IV) has a noble gas configuration. Which of the following is correct statement about it?
JEE Main 2022 (Online) 25th June Morning Shift
Among the following, which is the strongest oxidizing agent?
JEE Main 2022 (Online) 24th June Evening Shift
Metals generally melt at very high temperature. Amongst the following, the metal with the highest melting point will be :
JEE Main 2021 (Online) 1st September Evening Shift
In the given chemical reaction, colors of the Fe2+ and Fe3+ ions, are respectively :5Fe2+ + MnO$$_4^ - $$ + 8H+ $$\to$$ Mn2+ + 4H2O + 5Fe3+...
JEE Main 2021 (Online) 1st September Evening Shift
Identify the element for which electronic configuration in +3 oxidation state is [Ar]3d5 :
JEE Main 2021 (Online) 31st August Evening Shift
The Eu2+ ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of Eu = 63]
JEE Main 2021 (Online) 31st August Evening Shift
In which one of the following sets all species show disproportionation reaction?
JEE Main 2021 (Online) 31st August Morning Shift
In the structure of the dichromate ion, there is a :
JEE Main 2021 (Online) 31st August Morning Shift
Which one of the following lanthanides exhibits +2 oxidation state with diamagnetic nature? (Given Z for Nd = 60, Yb = 70, La = 57, Ce = 58)
JEE Main 2021 (Online) 27th August Evening Shift
The addition of dilute NaOH to Cr3+ salt solution will give :
JEE Main 2021 (Online) 27th August Evening Shift
Potassium permanganate on heating at 513 K gives a product which is :
JEE Main 2021 (Online) 27th August Morning Shift
The nature of oxides V2O3 and CrO is indexed as 'X' and 'Y' type respectively. The correct set of X and Y is :
JEE Main 2021 (Online) 26th August Morning Shift
Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere?
JEE Main 2021 (Online) 25th July Evening Shift
The spin only magnetic moments (in BM) for free Ti3+, V2+ and Sc3+ ions respectively are :(At.No. Sc : 21, Ti : 22, V : 23)...
JEE Main 2021 (Online) 25th July Evening Shift
Which one of the following metals forms interstitial hydride easily?
JEE Main 2021 (Online) 25th July Morning Shift
The correct order of following 3d metal oxides, according to their oxidation numbers is :(a) CrO3, (b) Fe2O3, (c) MnO2, (d) V2O5, (e) Cu2O...
JEE Main 2021 (Online) 22th July Evening Shift
The set having ions which are coloured and paramagnetic both is :
JEE Main 2021 (Online) 18th March Evening Shift
The oxide that shows magnetic property is :
JEE Main 2021 (Online) 18th March Morning Shift
Match List - I with List - II List - I List - II (a) Chlorophyll (i) Ruthenium (b) Vitamin...
JEE Main 2021 (Online) 17th March Evening Shift
The common positive oxidation states for an element with atomic number 24, are :
JEE Main 2021 (Online) 17th March Morning Shift
What is the spin-only magnetic moment value (BM) of a divalent metal ion with atomic number 25, in it's aqueous solution?
JEE Main 2021 (Online) 17th March Morning Shift
Given below are two statements :Statement I : Potassium permanganate on heating at 573K forms potassium manganate.Statement II : Both potassium perman...
JEE Main 2021 (Online) 16th March Evening Shift
Fex2 and Fey3 are known when x and y are :
JEE Main 2021 (Online) 16th March Evening Shift
Arrange the following metal complex/compounds in the increasing order of spin only magnetic moment. Presume all the three, high spin system.(Atomic nu...
JEE Main 2021 (Online) 16th March Morning Shift
Given below are two statements :Statement I : The Eo value for Ce4+ / Ce3+ is + 1.74 V.Statement II : Ce is more stable in Ce4+ state than Ce3+ state....
JEE Main 2021 (Online) 16th March Morning Shift
Given below are two statement : one is labelled as Assertion A and the other is labelled as Reason R :Assertion A : Size of Bk3+ ion is less than Np3+...
JEE Main 2021 (Online) 26th February Morning Shift
Which one of the following lanthanoids does not form MO2? [M is lanthanoid metal]
JEE Main 2021 (Online) 25th February Morning Shift
Given below are two statements :Statement I : CeO2 can be used for oxidation of aldehydes and ketones.Statement II : Aqueous solution of EuSO4 is a st...
JEE Main 2021 (Online) 25th February Morning Shift
In which of the following pairs, the outer most electronic configuration will be the same?
JEE Main 2021 (Online) 24th February Evening Shift
The incorrect statement among the following is :
JEE Main 2021 (Online) 24th February Evening Shift
What is the correct order of the following elements with respect to their density?
JEE Main 2021 (Online) 24th February Morning Shift
Given below are two statements : Statement I : Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame. Statement II : Cupro...
JEE Main 2020 (Online) 6th September Evening Slot
Mischmetal is an alloy consisting mainly of :
JEE Main 2020 (Online) 6th September Morning Slot
The lanthanoid that does NOT show +4 oxidation state is :
JEE Main 2020 (Online) 6th September Morning Slot
The set that contains atomic numbers of only transition elements, is :
JEE Main 2020 (Online) 5th September Morning Slot
The correct electronic configuration and spin-only magnetic moment (BM) of Gd3+ (Z = 64), respectively, are :
JEE Main 2020 (Online) 5th September Morning Slot
In the sixth period, the orbitals that are filled are :
JEE Main 2020 (Online) 4th September Evening Slot
The incorrect statement(s) among (a) - (c) is (are) (a) W(VI) is more stable than Cr(VI). (b) In the presence of HCl, permanganate titrations provide ...
JEE Main 2020 (Online) 4th September Morning Slot
The elements with atomic numbers 101 and 104 belong to, respectively :
JEE Main 2020 (Online) 3rd September Evening Slot
The incorrect statement is :
JEE Main 2020 (Online) 9th January Evening Slot
5 g of zinc is treated separately with an excess of (a) dilute hydrochloric acid and (b) aqueous sodium hydroxide. The ratio of the volumes of H2 evol...
JEE Main 2020 (Online) 7th January Morning Slot
The atomic radius of Ag is closed to :
JEE Main 2019 (Online) 12th April Evening Slot
The pair that has similar atomic radii is :
JEE Main 2019 (Online) 10th April Evening Slot
The highest possible oxidation states of uranium and plutonium, respectively are :
JEE Main 2019 (Online) 10th April Evening Slot
The INCORRECT statement is :
JEE Main 2019 (Online) 10th April Evening Slot
The correct order of the first ionization enthalpies is :
JEE Main 2019 (Online) 10th April Morning Slot
Consider the hydrated ions of Ti2+, V2+, Ti3+, and Sc3+. The correct order of their spin-only magnetic moments is : ...
JEE Main 2019 (Online) 9th April Evening Slot
The maximum number of possible oxidation states of actinoides are shown by :
JEE Main 2019 (Online) 8th April Evening Slot
The statement that is INCORRECT about the interstitial compounds is :
JEE Main 2019 (Online) 12th January Evening Slot
The correct order of atomic radii is :
JEE Main 2019 (Online) 11th January Evening Slot
$$\underline A \,\,\buildrel {4KOH,{O_2}} \over \longrightarrow \,\,\mathop {2\underline B }\limits_{\left( {Green} \right)} \,\, + \,\,2{H_2}O$$ $$3...
JEE Main 2019 (Online) 11th January Morning Slot
The element that usually does NOT show variable oxidation states is :
JEE Main 2019 (Online) 10th January Evening Slot
The 71st electron of an element X with an atomic number of 71 enters into the orbital :
JEE Main 2019 (Online) 10th January Morning Slot
Wilkinson catalyst is : (Et = C2H5)
JEE Main 2019 (Online) 10th January Morning Slot
The effect of lanthanoid contraction in the lanthanoid series of elements by and large means :
JEE Main 2019 (Online) 9th January Evening Slot
The transition element that has lowest enthalpy of atomisation, is :
JEE Main 2018 (Online) 16th April Morning Slot
The incorrect statement is :
JEE Main 2018 (Online) 16th April Morning Slot
When XO2 is fused with an alkali metal hydroxide in presence of an oxidizing agent such as KNO3 ; a dark green product is formed which disproportioat...
JEE Main 2017 (Online) 9th April Morning Slot
Which of the following ions does not liberate hydrogen gas on reaction with dilute acids ?
JEE Main 2017 (Online) 8th April Morning Slot
The pair of compounds having metals in their highest oxidation state is :
JEE Main 2017 (Offline)
In the following reactions, ZnO is respectively acting as a/an : (a) ZnO + Na2O $$\to$$ Na2ZnO2 (b) ZnO + CO2 $$\to$$ ZnCO3...
JEE Main 2016 (Online) 10th April Morning Slot
The transition metal ions responsible for color in ruby and emerald are, respectively :
JEE Main 2016 (Online) 9th April Morning Slot
Which one of the following species is stable in aqueous solution?
JEE Main 2016 (Offline)
The reaction of zinc with dilute and concentrated nitric acid, respectively, produces :
JEE Main 2016 (Offline)
Which of the following compounds is metallic and ferromagnetic ?
JEE Main 2015 (Offline)
The colour of KMnO4 is due to :
JEE Main 2015 (Offline)
Match the catalysts to the correct processes : .tg {border-collapse:collapse;border-spacing:0;border:none;border-color:#999;} .tg td{font-family:Ari...
JEE Main 2014 (Offline)
Which series of reactions correctly represents chemical relations related to iron and its compound?
JEE Main 2013 (Offline)
Which of the following arrangements does not represent the correct order of the property stated against it?
JEE Main 2013 (Offline)
Four successive members of the first row transition elements are listed below with atomic numbers. Which one of them is expected to have the highest $...
AIEEE 2012
Iron exhibits + 2 and +3 oxidation states. Which of the following statements about iron is incorrect?
AIEEE 2011
In context of the lanthanoids, which of the following statements is not correct?
AIEEE 2011
The outer electron configuration of $$Gd$$ (Atomic No. $$64$$) is :
AIEEE 2009
In context with the transition elements, which of the following statements is incorrect ?
AIEEE 2009
Knowing that the Chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect?
AIEEE 2008
Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being :
AIEEE 2008
Amount of oxalic acid present in a solution can be determined by its titration with $$KMn{O_4}$$ solution in the presence of $${H_2}S{O_4}.$$ The tit...
AIEEE 2007
Identify the incorrect statement among the following :
AIEEE 2007
The actinoids exhibits more number of oxidation states in general than the lanthanoids. This is because :
AIEEE 2006
The “spin-only” magnetic moment [in units of Bohr magneton, (µB)] of Ni2+ in aqueous solution would be : (Atomic number of Ni = 28) ...
AIEEE 2006
Lanthanoid contraction is caused due to :
AIEEE 2006
A metal, $$M$$ forms chlorides in its $$+2$$ and $$+4$$ oxidation states. Which of the following statements about these chlorides is correct?
AIEEE 2005
The lanthanide contraction is responsible for the fact that :
AIEEE 2005
Which of the following factors may be regarded as the main cause of lanthanide contraction?
AIEEE 2005
The oxidation state of chromium in the final product formed the reaction between $$K{\rm I}$$ and acidified potassium dichromate solution is :
AIEEE 2005
On heating mixture of $$C{u_2}O$$ and $$C{u_2}S$$ will give :
AIEEE 2005
Calomel $$\left( {H{g_2}C{l_2}} \right)$$ on reaction with ammonium hydroxide gives :
AIEEE 2004
Excess of KI reacts with CuSO4 solution and then Na2S2O3 solution is added to it. Which of the statements is incorrect for this reaction?...
AIEEE 2004
Cerium (Z = 58) is an important member of the lanthanoids. Which of the following statements about cerium is incorrect?
AIEEE 2004
Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them?
AIEEE 2003
The number of d-electrons retained in Fe2+ (At no of Fe = 26) ion is :
AIEEE 2003
For making good quality mirrors, plates of float glass are used. These are obtained by floating molten glass over a liquid metal which does not solidi...
AIEEE 2003
What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid?
AIEEE 2003
The atomic numbers of vanadium (V), Chromium (Cr), manganese (Mn) and iron (Fe) are respectively 23, 24, 25 and 26. Which one of these may be expected...
AIEEE 2003
Which one of the following nitrates will leave behind a metal on strong heating?
AIEEE 2003
The radius of La3+ (Atomic number of La = 57) is 1.06 Å. Which one of the following given values will be closest to the radius of Lu3+ (Atomic number ...
AIEEE 2003
Which one of the following statements is correct?
AIEEE 2003
A red solid is insolvable in water. However it becomes soluble if some $$K{\rm I}$$ is added to water. Heating the red solid in a test tube results in...
AIEEE 2002
When KMnO4 acts as an oxidising agent and ultimately forms [MnO4]-2, MnO2, Mn2O3, Mn+2 then the number of electrons transferred in each case respectiv...
AIEEE 2002
Which of the following ions has the maximum magnetic moment?
AIEEE 2002
Most common oxidation states of Ce (cerium) are :
AIEEE 2002
How do we differentiate between Fe3+ and Cr3+ in group III?

Numerical

JEE Main 2024 (Online) 30th January Evening Shift
Number of metal ions characterized by flame test among the following is ________. $$\mathrm{Sr}^{2+}, \mathrm{Ba}^{2+}, \mathrm{Ca}^{2+}, \mathrm{Cu}^...
JEE Main 2024 (Online) 27th January Evening Shift
Total number of ions from the following with noble gas configuration is _________. $$\mathrm{Sr}^{2+}(z=38), \mathrm{Cs}^{+}(z=55), \mathrm{La}^{2+}(z...
JEE Main 2023 (Online) 15th April Morning Shift
In Chromyl chloride, the oxidation state of chromium is $(+)$ _______________.
JEE Main 2023 (Online) 15th April Morning Shift
The total change in the oxidation state of manganese involved in the reaction of $\mathrm{KMnO}_{4}$ and potassium iodide in the acidic medium is ____...
JEE Main 2023 (Online) 1st February Evening Shift
Among following compounds, the number of those present in copper matte is ___________. A. $$\mathrm{CuCO_{3}}$$ B. $$\mathrm{Cu_{2}S}$$ C. $$\mathrm{C...
JEE Main 2023 (Online) 30th January Morning Shift
The number of electrons involved in the reduction of permanganate to manganese dioxide in acidic medium is _____________.
JEE Main 2023 (Online) 25th January Morning Shift
How many of the following metal ions have similar value of spin only magnetic moment in gaseous state? ______________ (Given : Atomic number V, 23; Cr...
JEE Main 2022 (Online) 28th July Morning Shift
The disproportionation of $$\mathrm{MnO}_{4}^{2-}$$ in acidic medium resulted in the formation of two manganese compounds $$\mathrm{A}$$ and $$\mathrm...
JEE Main 2022 (Online) 26th July Evening Shift
The spin-only magnetic moment value of the compound with strongest oxidizing ability among $$\mathrm{MnF}_{4}, \mathrm{MnF}_{3}$$ and $$\mathrm{MnF}_{...
JEE Main 2022 (Online) 25th July Morning Shift
Among Co3+, Ti2+, V2+ and Cr2+ ions, one if used as a reagent cannot liberate H2 from dilute mineral acid solution, its spin-only magnetic moment in g...
JEE Main 2022 (Online) 29th June Evening Shift
Spin only magnetic moment of [MnBr6]4$$-$$ is _________ B.M. (round off to the closest integer)
JEE Main 2022 (Online) 29th June Evening Shift
For the reaction given below : CoCl3 . xNH3 + AgNO3 (aq) $$\to$$ If two equivalents of AgCl precipitate out, then the value of x will be _____________...
JEE Main 2022 (Online) 29th June Morning Shift
The number of terminal oxygen atoms present in the product B obtained from the following reaction is _____________. FeCr2O4 + Na2CO3 + O2 $$\to$$ A + ...
JEE Main 2022 (Online) 29th June Morning Shift
An acidified manganate solution undergoes disproportionation reaction. The spin-only magnetic moment value of the product having manganese in higher o...
JEE Main 2022 (Online) 27th June Morning Shift
The number of statements correct from the following for Copper (at. no. 29) is/are ____________. (A) Cu(II) complexes are always paramagnetic. (B) Cu(...
JEE Main 2022 (Online) 26th June Morning Shift
The spin-only magnetic moment value of the most basic oxide of vanadium among V2O3, V2O4 and V2O5 is _____________ B.M. (Nearest integer)...
JEE Main 2022 (Online) 24th June Evening Shift
Manganese (VI) has ability to disproportionate in acidic solution. The difference in oxidation states of two ions it forms in acidic solution is _____...
JEE Main 2022 (Online) 24th June Morning Shift
The difference in oxidation state of chromium in chromate and dichromate salts is ___________.
JEE Main 2021 (Online) 31st August Evening Shift
The value of magnetic quantum number of the outermost electron of Zn+ ion is ______________.
JEE Main 2021 (Online) 27th August Morning Shift
The number of f electrons in the ground state electronic configuration of Np (Z = 93) is ___________. (Nearest integer)
JEE Main 2021 (Online) 26th August Morning Shift
The number of 4f electrons in the ground statement electronic configuration of Gd2+ is ___________. [Atomic number of Gd = 64]
JEE Main 2021 (Online) 25th July Evening Shift
Number of electrons present in 4f orbital of Ho3+ ion is ____________. (Given Atomic No. of Ho = 67)
JEE Main 2021 (Online) 22th July Evening Shift
Number of electrons that Vanadium (Z = 23) has in p-orbitals is equal to _____________
JEE Main 2021 (Online) 17th March Evening Shift
In the ground state of atomic Fe(Z = 26), the spin-only magnetic moment is ____________ $$\times$$ 10$$-$$1 BM. (Round off to the Nearest Integer). [G...
JEE Main 2021 (Online) 26th February Evening Shift
In mildly alkaline medium, thiosulphate ion is oxidized by $$MnO_4^ - $$ to "A". The oxidation state of sulphur in "A" is __________.
JEE Main 2020 (Online) 9th January Evening Slot
The sum of the total number of bonds between chromium and oxygen atoms in chromate and dichromate ions is ____________.
JEE Main 2020 (Online) 7th January Evening Slot
Consider the following reactions : $$NaCl{\rm{ }} + {\rm{ }}{K_2}C{r_2}{O_7} + \mathop {{H_2}S{O_4}}\limits_{(conc.)} $$$$ \to $$ (A) + side products ...

MCQ (More than One Correct Answer)

JEE Main 2022 (Online) 28th July Evening Shift
Which of the following pair is not isoelectronic species? (At. no. Sm, 62; Er, 68; Yb, 70; Lu, 71; Eu, 63; Tb, 65; Tm, 69)
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