d- and f-Block Elements PYQs Set 8 (PDF)

Set 8 of 14 · Questions 211-240 of 399

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Mere Teacher · Previous Year Questions NEET Chemistry · d- and f-Block Elements · Set 8 (Q211-240)
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211. $K_{2} C r_{2} O_{7} paper acidified with dilute H_{2} S O_{4} turns green when exposed to$ (1) $Carbon dioxide$ (2) $Sulphur trioxide$ (3) $Hydrogen sulphide$ (4) $Sulphur dioxide$ 212. $The first transition series metal ' M' has the highest enthalpy of atomisation in its series. One of its aquated ion (M^{n +}) exists in green colour. The nature of the oxide formed by the above M^{n +} ion is:$ (1) $basic$ (2) $neutral$ (3) $amphoteric$ (4) $acidic$ 213. $On heating potassium permanganate, one of the following compound is not obtained$ (1) $MnO$ (2) $K_{2} MnO_{4}$ (3) $O_{2}$ (4) $MnO_{2}$ 214. $Which of the following acts as a strong reducing agent? (Atomic number : Ce = 58, Eu = 63, Gd = 64, Lu = 71)$ (1) $Lu^{3 +}$ (2) $Gd^{3 +}$ (3) $Eu^{2 +}$ (4) $Ce^{4 +}$ 215. $Which of the following ions can reduce dilute acid to give hydrogen gas?$ (1) $Ti^{2 +}, Cr^{2 +}$ (2) $Mn^{3 +}, Ti^{2 +}$ (3) $Mn^{3 +}, Cr^{2 +}$ (4) $Co^{3 +}, Cr^{2 +}$ 216. $Assertion (A): In general, transition metals have high melting points. Reason (R): More number of electrons from '(n - 1)d' and ' ns ' are involved in interatomic metallic bonding.The correct option among the following is$ (1) $(A) is true, (R) is true and (R) is the correct explanation for (A)$ (2) $(A) is true, (R) is true but (R) is not the correct explanation for (A)$ (3) $(A) is true but (R) is false$ (4) $(A) is false but (R) is true$ 217. $Aqueous sulphite reacts with dilute sulphuric acid to form X (g) . The liberated X (g) is passed into acidified KMnO_{4} solution. What is the oxidation state of Mn in the product formed?$ (1) $+6$ (2) $+4$ (3) $+2$ (4) $+3$ 218. $The correct decreasing order of spin only magnetic moment values (BM) of Cu^{+}, Cu^{2 +}, Cr^{2 +} and Cr^{3 +} ions is:$ (1) $Cr^{3 +} > Cr^{2 +} > Cu^{+} > Cu^{2 +}$ (2) $Cu^{+} > Cu^{2 +} > Cr^{3 +} > Cr^{2 +}$ (3) $Cr^{2 +} > Cr^{3 +} > Cu^{2 +} > Cu^{+}$ (4) $Cu^{2 +} > Cu^{+} > Cr^{2 +} > Cr^{3 +}$ 219. $M n_{2} (CO)_{10} is an organometallic compound due to the presence of :$ (1) $Mn- C bond$ (2) $Mn- Mn bond$ (3) $Mn- O bond$ (4) $C- O bond$ 220. $Which of the following characteristics of the transition metals is associated with their catalytic activity?$ (1) $Colour of hydrated ions$ (2) $Diamagnetic behaviour$ (3) $Paramagnetic behaviour$ (4) $Variable oxidation states$ 221. $When MnO_{2} and H_{2} SO_{4} is added to a salt (A), the greenish yellow gas liberated as salt (A) is :$ (1) $CaI_{2}$ (2) $NaBr$ (3) $KNO_{3}$ (4) $NH_{4} Cl$ 222. $The formula mass of Mohr's salt is 392 . The iron present in it is oxidised by KMnO_{4} in acid medium. The equivalent mass of Mohr's salt is$ (1) $392$ (2) $31.6$ (3) $278$ (4) $156$ 223. $Which of the following has least tendency to liberate H_{2} from mineral acids ?$ (1) $Cu$ (2) $Mn$ (3) $Ni$ (4) $Zn$ 224. $In following pairs, the one in which both transition metal ions are colourless is :$ (1) $S c^{3 +}, Z n^{2 +}$ (2) $T i^{4 +}, C u^{2 +}$ (3) $V^{2 +}, T i^{3 +}$ (4) $Z n^{2 +}, M n^{2 +}$ 225. $Consider the following reactions K_{2} Cr_{2} O_{7} \to KOH - H_{2} O [A] \to H_{2} SO_{4} - H_{2} O [B] + K_{2} SO_{4} The products [A] and [B], respectively are:$ (1) $K_{2} CrO_{4} and CrO$ (2) $K_{2} CrO_{4} and Cr_{2} O_{3}$ (3) $K_{2} CrO_{4} and K_{2} Cr_{2} O_{7}$ (4) $K_{2} Cr (OH)_{6} and Cr_{2} O_{3}$ 226. $Mn^{2 +} compounds are more stable than Fe^{2 +} compounds towards oxidation to their +3 state, because$ (1) $Mn^{2 +} is more stable with high 3^{rd} ionisation energy$ (2) $Mn^{2 +} is bigger in size$ (3) $Mn^{2 +} has completely filled d-orbitals$ (4) $Mn^{2 +} does not exist.$ 227. $Name the gas that can readily decolourise acidified KMnO4 solution:$ (1) $CO2$ (2) $SO2$ (3) $NO2$ (4) $P2O5$ 228. $In lanthanide series, the element well known to exhibit +4 oxidation state is$ (1) $Lu$ (2) $Ce$ (3) $Pm$ (4) $Nd$ 229. $A and B formed in the following reactions are: CrO_{2} Cl_{2} + 4 NaOH \to A + 2 NaCl + 2 H_{2} O A + 2 HCl + 2 H_{2} O_{2} \to B + 3 H_{2} O$ (1) $A = Na_{2} CrO_{4}, B = CrO_{5}$ (2) $A = Na_{2} Cr_{2} O_{4}, B = CrO_{4}$ (3) $A = Na_{2} Cr_{2} O_{7}, B = CrO_{3}$ (4) $A = Na_{2} Cr_{2} O_{7}, B = CrO_{5}$ 230. $The set of correct statements is: (I) Manganese exhibits +7 oxidation state in its oxide. (II) Ruthenium and Osmium exhibit +8 oxidation in their oxides. (III) Sc shows +4 oxidation state which is oxidizing in nature. (IV) Cr shows oxidising nature in +6 oxidation state.$ (1) $(II)and(III)$ (2) $(I), (II) and (IV)$ (3) $(I) and (III)$ (4) $(II), (III) and (IV)$ 231. $Which of the following statement is not true about interstitial complexes?$ (1) $Small atom like C, H or N are trapped inside crystal lattice$ (2) $They are usually non-stoichiometric$ (3) $They generally \cdot retain metallic conductivity$ (4) $They are chemically very active$ 232. $The pair that has similar atomic radii is:$ (1) $Mn and Re$ (2) $Ti and Hf$ (3) $Sc and Ni$ (4) $Mo and W$ 233. $Lanthanoid ions with 4 f^{7} configuration are : (A) Eu^{2 +} (B) Gd^{3 +} (C) Eu^{3 +} (D) Tb^{3 +} ( E ) Sm^{2 +} Choose the correct answer from the options given below:$ (1) $(A) and (D) only$ (2) $(B) and (C) only$ (3) $(A) and (B) only$ (4) $(B) and (E) only$ 234. $What are X and Y in the following reactions? (i) MnO_{4}^{-} + I^{-} \to H + X (ii) MnO_{4}^{-} + I^{-} \to H 2 O Y$ (1) $I_{2}, IO_{4}^{-}$ (2) $I_{2}, IO_{3}^{-}$ (3) $IO_{3}^{-}, IO_{3}^{-}$ (4) $IO_{3}^{-}, I_{2}$ 235. $Which one of the following ions exhibits d‐d transition and paramagnetism as well?$ (1) $C r O_{4}^{2 -}$ (2) $C r_{2} O_{7}^{2 -}$ (3) $M n O_{4^{-}}$ (4) $M n O_{4}^{2 -}$ 236. $On heating a mixture of common salt and K_{2} Cr_{2} O_{7} in equal amount along with concentrated H_{2} SO_{4} in a test tube, a gas is evolved. Formula of the gas evolved and oxidation state of the central metal atom in the gas respectively are:$ (1) $Cr_{2} O_{2} Cl_{2} and +3$ (2) $CrO_{2} Cl_{2} and +5$ (3) $CrO_{2} Cl_{2} and +6$ (4) $Cr_{2} O_{2} Cl_{2} and +6$ 237. $Given below are two statements: Statement I : Iron (III) catalyst, acidified K_{2} C r_{2} O_{7} and neutral K M n O_{4} have the ability to oxidise I^{-} to I_{2} independently. Statement II: Manganate ion is paramagnetic in nature and involves p π - p π bonding. choose the correct answer from the options.$ (1) $Both statement I and Statement II are true$ (2) $Both statement I and Statement II are false$ (3) $Statement I is true but Statement II is false$ (4) $Statement I is false but Statement II is true$ 238. $The correct order of ionic radii of trivalent ions Y^{3 +}, La^{3 +}, Eu^{3 +}, and Lu^{3 +} is (Y = 39, La = 57, Eu = 63, Lu = 71)$ (1) $Lu^{3 +} < Eu^{3 +} < La^{3 +} < Y^{3 +}$ (2) $La^{3 +} < Eu^{3 +} < Lu^{3 +} < Y^{3 +}$ (3) $Y^{3 +} < Lu^{3 +} < Eu^{3 +} < La^{3 +}$ (4) $Y^{3 +} < La^{3 +} < Eu^{3 +} < Lu^{3 +}$ 239. $Which of the following set of elements do not possess f-electrons?$ (1) $La, U, Lr$ (2) $La, Th, Lr$ (3) $La, Ac, Th$ (4) $Ce, Ac, Th$ 240. $Which of the following statements is wrong regarding lanthanoids?$ (1) $In(III) compounds are predominantly ionic in character.$ (2) $Ln(III) hydroxides are mainly basic in nature.$ (3) $The ionic size of Ln (111) ions decreases with increasing atomic number.$ (4) $Ln (III) compounds are generally colourless.$