JEE Main
Chemistry
d and f Block Elements
Previous Years Questions

MCQ (Single Correct Answer)

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...
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...
Identify correct statements from below: A. The chromate ion is square planar. B. Dichromates are generally prepared from chromates. C. The green manga...
The metals that are employed in the battery industries are A. $$\mathrm{Fe}$$ B. $$\mathrm{Mn}$$ C. $$\mathrm{Ni}$$ D. $$\mathrm{Cr}$$ E. $$\mathrm{Cd...
The orange colour of $$\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$$ and purple colour of $$\mathrm{KMnO}_4$$ is due to
Diamagnetic Lanthanoid ions are :
Which of the following acts as a strong reducing agent? (Atomic number: $$\mathrm{Ce}=58, \mathrm{Eu}=63, \mathrm{Gd}=64, \mathrm{Lu}=71$$)
Which of the following statements are correct about $$\mathrm{Zn}, \mathrm{Cd}$$ and $$\mathrm{Hg}$$ ? A. They exhibit high enthalpy of atomization as...
The correct IUPAC name of $$\mathrm{K}_2 \mathrm{MnO}_4$$ is
$$\mathrm{KMnO}_4$$ decomposes on heating at $$513 \mathrm{~K}$$ to form $$\mathrm{O}_2$$ along with
Given below are two statements : Statement (I) : In the Lanthanoids, the formation $$\mathrm{Ce}^{+4}$$ is favoured by its noble gas configuration. St...
Choose the correct option having all the elements with $$\mathrm{d}^{10}$$ electronic configuration from the following :
Which of the following electronic configuration would be associated with the highest magnetic moment?
$$\mathrm{NaCl}$$ reacts with conc. $$\mathrm{H}_2 \mathrm{SO}_4$$ and $$\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$$ to give reddish fumes (B), which re...
The electronic configuration for Neodymium is: [Atomic Number for Neodymium 60]
The pair of lanthanides in which both elements have high third - ionization energy is :
Given below are two statement: one is labelled as Assertion $$\mathbf{A}$$ and the other is labelled as Reason $$\mathbf{R}$$ Assertion A: $$5 \mathrm...
Prolonged heating is avoided during the preparation of ferrous ammonium sulphate to :
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...
Which halogen is known to cause the reaction given below : $$2 \mathrm{Cu}^{2+}+4 \mathrm{X}^{-} \rightarrow \mathrm{Cu}_{2} \mathrm{X}_{2}(\mathrm{s}...
In chromyl chloride, the number of d-electrons present on chromium is same as in (Given at no. of $$\mathrm{Ti}: 22, \mathrm{~V}: 23, \mathrm{Cr}: 24,...
Element not present in Nessler's reagent is :
Given below are two statements: one is labelled as "Assertion A" and the other is labelled as "Reason R" Assertion A : In the complex $$\mathrm{Ni}(\...
During the reaction of permanganate with thiosulphate, the change in oxidation of manganese occurs by value of 3. Identify which of the below medium w...
Strong reducing and oxidizing agents among the following, respectively, are :
Which element is not present in Nessler's reagent?
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : $$\mathrm{Cu^{2+}}$$ in wat...
Highest oxidation state of Mn is exhibited in $$\mathrm{Mn_2O_7}$$. The correct statements about $$\mathrm{Mn_2O_7}$$ are (A) Mn is tetrahedrally surr...
When $$\mathrm{Cu}^{2+}$$ ion is treated with $$\mathrm{KI}$$, a white precipitate, $$\mathrm{X}$$ appears in solution. The solution is titrated with ...
$$\mathrm{Nd^{2+}}$$ = __________
The correct order of basicity of oxides of vanadium is :
Formulae for Nessler's reagent is :
$\mathrm{KMnO}_4$ oxidises $\mathrm{I}^{-}$ in acidic and neutral/faintly alkaline solutions, respectively, to :
During the qualitative analysis of $$\mathrm{SO}_{3}^{2-}$$ using dilute $$\mathrm{H}_{2} \mathrm{SO}_{4}, \mathrm{SO}_{2}$$ gas is evolved which turn...
Given below are two statements : Statement I : Nickel is being used as the catalyst for producing syn gas and edible fats. Statement II : Silicon form...
The set of correct statements is : (i) Manganese exhibits +7 oxidation state in its oxide. (ii) Ruthenium and Osmium exhibit +8 oxidation in their oxi...
An indicator 'X' is used for studying the effect of variation in concentration of iodide on the rate of reaction of iodide ion with $$\mathrm{H_2O_2}$...
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...
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...
An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime. The metal ion is :
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...
The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives :
In following pairs, the one in which both transition metal ions are colourless is :
In neutral or faintly alkaline medium, $$\mathrm{KMnO}_{4}$$ being a powerful oxidant can oxidize, thiosulphate almost quantitatively, to sulphate. In...
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...
Which of the following has least tendency to liberate $$\mathrm{H}_{2}$$ from mineral acids?
In neutral or alkaline solution, $$\mathrm{MnO}_{4}^{-}$$ oxidises thiosulphate to :
Given below are two statements. Statement I : Iron (III) catalyst, acidified $$\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$$ and neutral $$\mathrm{K...
The total number of $$\mathrm{Mn}=\mathrm{O}$$ bonds in $$\mathrm{Mn}_{2} \mathrm{O}_{7}$$ is __________.
The dark purple colour of $$\mathrm{KMnO}_{4}$$ disappears in the titration with oxalic acid in acidic medium. The overall change in the oxidation num...
The electronic configuration of Pt (atomic number 78) is :
Which one of the lanthanoids given below is the most stable in divalent form?
The 'f' orbitals are half and completely filled, respectively in lanthanide ions : [Given : Atomic no. Eu, 63; Sm, 62; Tm, 69; Tb, 65; Yb, 70; Dy, 66]...
The most common oxidation state of Lanthanoid elements is +3. Which of the following is likely to deviate easily from +3 oxidation state?
The metal ion (in gaseous state) with lowest spin-only magnetic moment value is :
Cerium (IV) has a noble gas configuration. Which of the following is correct statement about it?
Among the following, which is the strongest oxidizing agent?
Metals generally melt at very high temperature. Amongst the following, the metal with the highest melting point will be :
In the given chemical reaction, colors of the Fe2+ and Fe3+ ions, are respectively :5Fe2+ + MnO$$_4^ - $$ + 8H+ $$\to$$ Mn2+ + 4H2O + 5Fe3+...
Identify the element for which electronic configuration in +3 oxidation state is [Ar]3d5 :
The Eu2+ ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of Eu = 63]
In which one of the following sets all species show disproportionation reaction?
In the structure of the dichromate ion, there is a :
Which one of the following lanthanides exhibits +2 oxidation state with diamagnetic nature? (Given Z for Nd = 60, Yb = 70, La = 57, Ce = 58)
The addition of dilute NaOH to Cr3+ salt solution will give :
Potassium permanganate on heating at 513 K gives a product which is :
The nature of oxides V2O3 and CrO is indexed as 'X' and 'Y' type respectively. The correct set of X and Y is :
Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere?
The spin only magnetic moments (in BM) for free Ti3+, V2+ and Sc3+ ions respectively are :(At.No. Sc : 21, Ti : 22, V : 23)...
Which one of the following metals forms interstitial hydride easily?
The correct order of following 3d metal oxides, according to their oxidation numbers is :(a) CrO3, (b) Fe2O3, (c) MnO2, (d) V2O5, (e) Cu2O...
The set having ions which are coloured and paramagnetic both is :
The oxide that shows magnetic property is :
Match List - I with List - II List - I List - II (a) Chlorophyll (i) Ruthenium (b) Vitamin...
The common positive oxidation states for an element with atomic number 24, are :
What is the spin-only magnetic moment value (BM) of a divalent metal ion with atomic number 25, in it's aqueous solution?
Given below are two statements :Statement I : Potassium permanganate on heating at 573K forms potassium manganate.Statement II : Both potassium perman...
Fex2 and Fey3 are known when x and y are :
Arrange the following metal complex/compounds in the increasing order of spin only magnetic moment. Presume all the three, high spin system.(Atomic nu...
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....
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+...
Which one of the following lanthanoids does not form MO2? [M is lanthanoid metal]
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...
In which of the following pairs, the outer most electronic configuration will be the same?
The incorrect statement among the following is :
What is the correct order of the following elements with respect to their density?
Given below are two statements : Statement I : Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame. Statement II : Cupro...
Mischmetal is an alloy consisting mainly of :
The lanthanoid that does NOT show +4 oxidation state is :
The set that contains atomic numbers of only transition elements, is :
The correct electronic configuration and spin-only magnetic moment (BM) of Gd3+ (Z = 64), respectively, are :
In the sixth period, the orbitals that are filled are :
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 ...
The elements with atomic numbers 101 and 104 belong to, respectively :
The incorrect statement is :
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...
The atomic radius of Ag is closed to :
The pair that has similar atomic radii is :
The highest possible oxidation states of uranium and plutonium, respectively are :
The INCORRECT statement is :
The correct order of the first ionization enthalpies is :
Consider the hydrated ions of Ti2+, V2+, Ti3+, and Sc3+. The correct order of their spin-only magnetic moments is : ...
The maximum number of possible oxidation states of actinoides are shown by :
The statement that is INCORRECT about the interstitial compounds is :
The correct order of atomic radii is :
$$\underline A \,\,\buildrel {4KOH,{O_2}} \over \longrightarrow \,\,\mathop {2\underline B }\limits_{\left( {Green} \right)} \,\, + \,\,2{H_2}O$$ $$3...
The element that usually does NOT show variable oxidation states is :
The 71st electron of an element X with an atomic number of 71 enters into the orbital :
Wilkinson catalyst is : (Et = C2H5)
The effect of lanthanoid contraction in the lanthanoid series of elements by and large means :
The transition element that has lowest enthalpy of atomisation, is :
The incorrect statement is :
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...
Which of the following ions does not liberate hydrogen gas on reaction with dilute acids ?
The pair of compounds having metals in their highest oxidation state is :
In the following reactions, ZnO is respectively acting as a/an : (a) ZnO + Na2O $$\to$$ Na2ZnO2 (b) ZnO + CO2 $$\to$$ ZnCO3...
The transition metal ions responsible for color in ruby and emerald are, respectively :
Which one of the following species is stable in aqueous solution?
The reaction of zinc with dilute and concentrated nitric acid, respectively, produces :
Which of the following compounds is metallic and ferromagnetic ?
The colour of KMnO4 is due to :
Match the catalysts to the correct processes : .tg {border-collapse:collapse;border-spacing:0;border:none;border-color:#999;} .tg td{font-family:Ari...
Which series of reactions correctly represents chemical relations related to iron and its compound?
Which of the following arrangements does not represent the correct order of the property stated against it?
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 $...
Iron exhibits + 2 and +3 oxidation states. Which of the following statements about iron is incorrect?
In context of the lanthanoids, which of the following statements is not correct?
The outer electron configuration of $$Gd$$ (Atomic No. $$64$$) is :
Knowing that the Chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect?
In context with the transition elements, which of the following statements is incorrect ?
Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being :
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...
Identify the incorrect statement among the following :
The actinoids exhibits more number of oxidation states in general than the lanthanoids. This is because :
The “spin-only” magnetic moment [in units of Bohr magneton, (µB)] of Ni2+ in aqueous solution would be : (Atomic number of Ni = 28) ...
Lanthanoid contraction is caused due to :
A metal, $$M$$ forms chlorides in its $$+2$$ and $$+4$$ oxidation states. Which of the following statements about these chlorides is correct?
The lanthanide contraction is responsible for the fact that :
Which of the following factors may be regarded as the main cause of lanthanide contraction?
The oxidation state of chromium in the final product formed the reaction between $$K{\rm I}$$ and acidified potassium dichromate solution is :
On heating mixture of $$C{u_2}O$$ and $$C{u_2}S$$ will give :
Calomel $$\left( {H{g_2}C{l_2}} \right)$$ on reaction with ammonium hydroxide gives :
Excess of KI reacts with CuSO4 solution and then Na2S2O3 solution is added to it. Which of the statements is incorrect for this reaction?...
Cerium (Z = 58) is an important member of the lanthanoids. Which of the following statements about cerium is incorrect?
Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them?
The number of d-electrons retained in Fe2+ (At no of Fe = 26) ion is :
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...
What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid?
Which one of the following nitrates will leave behind a metal on strong heating?
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...
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 ...
Which one of the following statements is correct?
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...
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...
Most common oxidation states of Ce (cerium) are :
Which of the following ions has the maximum magnetic moment?
How do we differentiate between Fe3+ and Cr3+ in group III?

Numerical

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

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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