JEE Main
Chemistry
d and f Block Elements
Previous Years Questions

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...
Given below are two statements: Statement I: Chlorine can easily combine with oxygen to form oxides; and the product has a tendency to explode. Statem...
$\mathrm{KMnO}_4$ oxidises $\mathrm{I}^{-}$ in acidic and neutral/faintly alkaline solutions, respectively, to
In the wet tests for identification of various cations by precipitation, which transition element cation doesn't belong to group IV in qualitative ino...
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...
An indicator 'X' is used for studying the effect of variation in concentration of iodide on the rate of reaction of iodide ion with $$\mathrm{H_2O_2}... Which one amongst the following are good oxidizing agents? A. Sm$$^{2+}$$B. Ce$$^{2+}$$C. Ce$$^{4+}$$D. Tb$$^{4+}$$Choose the most appropriate ans... Assertion A : Hydrolysis of an alkyl chloride is a slow reaction but in the presence of NaI, the rate of the hydrolysis increases. Reason R : I$$^{-}$... An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime. The metal ion is : In liquation process used for tin (Sn), the metal Given below are two statements. Statement I : Stannane is an example of a molecular hydride. Statement II : Stannane is a planar molecule. In the ligh... 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 : Concentrated $$\mathrm{HNO}_{3}$$ reacts with Iodine to give Which of the following has least tendency to liberate $$\mathrm{H}_{2}$$ from mineral acids? For kinetic study of the reaction of iodide ion with $$\mathrm{H}_{2} \mathrm{O}_{2}$$ at room temperature : (A) Always use freshly prepared starch so... 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{KM... Match List I with List II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-famil... Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Finest gold is red in colour, as th... 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 During halogen test, sodium fusion extract is boiled with concentrated HNO3 to 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 The deposition of X and Y on ground surfaces is referred as wet and dry depositions, respectively. X and Y are : Which one of the following correctly represents the order of stability of oxides, X2O; (X = halogen)? In the structure of the dichromate ion, there is a : 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... Cu2+ salt reacts with potassium iodide to give The secondary valency and the number of hydrogen bonded water molecule(s) in CuSO4 . 5H2O, respectively, are : Given below are two statements :Statement I : Potassium permanganate on heating at 573K forms potassium manganate.Statement II : Both potassium perman... Which of the following is Lindlar catalyst? Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.Assertion A : In TlI3, isomorphous to CsI3, the ... Which one of the following lanthanoids does not form MO2? [M is lanthanoid metal] 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 : 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... When gypsum is heated to 393 K, it forms : The maximum number of possible oxidation states of actinoides are shown by The statement that is INCORRECT about the interstitial compounds is : Chlorine on reaction with hot and concentrated sodium hydroxide give - The hydride that is NOT electron deficient The element that usually does NOT show variable oxidation states is : Hall- Heroult's process is given by Wilkinson catalyst is : (Et = C2H5) 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 ? In the following reactions, ZnO is respectively acting as a/an: (a) ZnO + Na2O$$\to$$Na2ZnO2 (b) ZnO + CO2$$\to$$ZnCO3... The transition metal ions responsible for color in ruby and emerald are, respectively : Which one of the following species is stable in aqueous solution ? Which of the following compounds is metallic and ferromagnetic ? Match the catalysts to the correct processes : .tg {border-collapse:collapse;border-spacing:0;border:none;border-color:#999;} .tg td{font-family:Ari... Which series of reactions correctly represents chemical relations related to iron and its compound ? Which of the following arrangements does not represent the correct order of the property stated against it ? Four successive members of the first row transition elements are listed below with atomic numbers. Which one of them is expected to have the highest ... Iron exhibits + 2 and +3 oxidation states. Which of the following statements about iron is incorrect ? In context of the lanthanoids, which of the following statements is not correct ? The outer electron configuration of$$Gd$$(Atomic No.$$64$$) is : In context with the transition elements, which of the following statements is incorrect ? Knowing that the Chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect ? Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being Amount of oxalic acid present in a solution can be determined by its titration with$$KMn{O_4}$$solution in the presence of$${H_2}S{O_4}.$$The tit... Identify the incorrect statement among the following The actinoids exhibits more number of oxidation states in general than the lanthanoids. This is because The stability of dihalides of$$Si,Ge,Sn$$and$$Pb$$increases steadily in the sequence Lanthanoid contraction is caused due to A metal,$$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}$$and acidified potassium dichromate solution is : Heating mixture of$$C{u_2}O$$and$$C{u_2}S$$will give Calomel$$\left( {H{g_2}C{l_2}} \right)$$on reaction with ammonium hydroxide gives Cerium (Z = 58) is an important member of the lanthanoids. Which of the following statements about cerium is incorrect? Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them? The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White m... What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid? The atomic numbers of vanadium (V), Chromium (Cr), manganese (Mn) and iron (Fe) are respectively 23, 24, 25 and 26. Which one of these may be expected... Which one of the following nitrates will leave behind a metal on strong heating? The radius of La3+ (Atomic number of La = 57) is 1.06 Å. Which one of the following given values will be closest to the radius of Lu3+ (Atomic number ... A red solid is insolvable in water. However it becomes soluble if some$$K{\rm I}$$is added to water. Heating the red solid in a test tube results in... When KMnO4 acts as an oxidising agent and ultimately forms [MnO4]-2, MnO2, Mn2O3, Mn+2 then the number of electrons transferred in each case respectiv... Which of the following ions has the maximum magnetic moment ? Most common oxidation states of Ce (cerium) are How do we differentiate between Fe3+ and Cr3+ in group III? The type isomerism present in nitropentammine chromium$$\left( {{\rm I}{\rm I}{\rm I}} \right)$$chloride is ## Numerical The number of electrons involved in the reduction of permanganate to manganese dioxide in acidic medium is _____________. Among Co3+, Ti2+, V2+ and Cr2+ ions, one if used as a reagent cannot liberate H2 from dilute mineral acid solution, its spin-only magnetic moment in g... For the reaction given below : CoCl3 . x NH3 + AgNO3 (aq)$$\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$$A + ... An acidified manganate solution undergoes disproportionation reaction. The spin-only magnetic moment value of the product having manganese in higher o... The number of statements correct from the following for Copper (at. no. 29) is/are ____________. (A) Cu(II) complexes are always paramagnetic. (B) Cu(... The spin-only magnetic moment value of the most basic oxide of vanadium among V2O3, V2O4 and V2O5 is _____________ B.M. (Nearest integer)... Manganese (VI) has ability to disproportionate in acidic solution. The difference in oxidation states of two ions it forms in acidic solution is _____... The number of halogen/(s) forming halic (V) acid is ___________. Consider the following reactions :$$NaCl{\rm{ }} + {\rm{ }}{K_2}C{r_2}{O_7} + \mathop {{H_2}S{O_4}}\limits_{(conc.)}  \to$\$ (A) + side products ...
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