s-Block Elements PYQs Set 8 (PDF)

Set 8 of 20 · Questions 211-240 of 573

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Mere Teacher · Previous Year Questions NEET Chemistry · s-Block Elements · Set 8 (Q211-240)
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211. $The ionic mobility of alkali metal ions in aqueous solution is maximum for :$ (1) $K^{+}$ (2) $R b^{+}$ (3) $L i^{+}$ (4) $N a^{+}$ 212. $Assertion (A): Be and Mg do not impart any colour to the flame.Reason (R) : The electrons in them are strongly bound to get excited the by flame.The correct option among the following is:$ (1) $(A) and (R) are true, (R) is the correct explanation of (A)$ (2) $(A) and (R) are true, but (R) is not the correct explanation of (A)$ (3) $(A) is correct but (R) is incorrect$ (4) $(A) is incorrect but (R) is correct$ 213. $A black coloured element with n s^{2} n p^{1} outer electronic configuration cannot react with air in its crystalline form. However, in amorphous form, it gives an oxide in air which is acidic in nature. Identify the element.$ (1) $Boron$ (2) $Aluminium$ (3) $Gallium$ (4) $Indium$ 214. $(NH_{4})_{2} Cr_{2} O_{7} on heating liberates a gas. The same gas will be obtained by$ (1) $treating H_{2} O_{2} with NaNO_{2}$ (2) $treating Mg_{3} N_{2} with H_{2} O$ (3) $heating NH_{4} NO_{3}$ (4) $heating NH_{4} NO_{2}$ 215. $Match the following columns. Column I (Reaction) (A). B_{2} H_{6} + 2 CO \to (B). B_{2} H_{6} + 3 O_{2} \to (C). B_{2} H_{6} + 6 H_{2} O \to Column II (Main product) I. B_{2} O_{3} II. 2 BH_{3} \cdot CO III. 2 H_{3} BO_{3} (IV). 2 BH_{2} (CO) (V). 2 HBO_{2} A B C$ (1) $IV I III$ (2) $II III V$ (3) $IV III I$ (4) $II I III$ 216. $In the case of alkali metals, the covalent character decreases in the order$ (1) $M F > M C l > M B r > M I$ (2) $M F > M C l > M I > M B r$ (3) $M I > M B r > M C l > M F$ (4) $M C 1 > M I > M B r > M F$ 217. $Phosphorus reacts with SO_{2} Cl_{2} to form PCl_{5} and X . At 723 K, HCl gas reacts with O_{2} in the presence of CuCl_{2} to form water and Y . Y reacts with X in water to form two acids A and B . What are A and B respectively?$ (1) $H_{2} SO_{4}, HCl$ (2) $H_{2} SO_{4}, HNO_{3}$ (3) $HCl, HNO_{3}$ (4) $H_{2} SO_{4}, H_{3} PO_{4}$ 218. $Which of the following statements about BF_{4}^{-} and AlF_{6}^{3 -} are correct? (i) B and Al differ in their oxidation states (ii) B and Al differ in their covalency (iii) B obeys the octet rule. (iv) B and Al are in diagonal relationship.$ (1) $(i), (ii)$ (2) $(ii), (iii), (iv)$ (3) $(i), (ii), (iii)$ (4) $(ii), (iii)$ 219. $In which of the following reactions, hydrogen is liberated? (i) Al (s) + HCl (aq) ⟶ (ii) Al (s) + NaOH (aq) ⟶ (iii) NaBH_{4} + I_{2} ⟶$ (1) $i, ii$ (2) $ii, iii$ (3) $i, iii$ (4) $i, ii, iii$ 220. $Among the sulphates of alkaline earth metals, the solubilities of BeSO_{4} and MgSO_{4} in water, respectively, are$ (1) $poor and poor$ (2) $poor and high$ (3) $high and poor$ (4) $high and high$ 221. $When gypsum is heated to 393 K it forms$ (1) $dead burnt plaster$ (2) $Anhydrous CaSO_{4}$ (3) $C a S O_{4} \cdot \frac{1}{2} H_{2} O$ (4) $CaSO_{4} \cdot 5 H_{2} O$ 222. $Aluminium reacts with dilute HCl and liberates a gas ' A' and with aqueous alkali liberates a gas ' B'. A and B respectively are$ (1) $Cl_{2}, O_{2}$ (2) $O_{2}, O_{2}$ (3) $Cl_{2}, H_{2}$ (4) $H_{2}, H_{2}$ 223. $Amongest H_{2} O, H_{2} S, H_{2} Se and H_{2} Te the one with highest boiling point is :$ (1) $H_{2} O because of H-bonding.$ (2) $H_{2} Te because of higher molecular weight.$ (3) $H_{2} S because of H-bonding.$ (4) $H_{2} Se because of lower molecular weight.$ 224. $The species that is not hydrolysed in water is$ (1) $P_{4} O_{10}$ (2) $BaO_{2}$ (3) $Mg_{3} N_{2}$ (4) $CaC_{2}$ 225. $Choose the acidic oxide from the following$ (1) $CO$ (2) $GeO$ (3) $SnO$ (4) $PbO$ 226. $XeF_{4} + O_{2} F_{2} \to X + O_{2} X + H_{2} O (1 mole) \to Y + 2 HF The shapes of molecules of x and y respectively are:$ (1) $Square planar, square pyramidal$ (2) $Distorted octahedral, square pyramidal$ (3) $Distorted tetrahedral Distorted octahedral$ (4) $Square pyramidal, Tetrahedral$ 227. $Which of the following has lowest melting point?$ (1) $Si$ (2) $Ge$ (3) $Sn$ (4) $Pb$ 228. $XeF_{6} on partial hydrolysis gives a compound X, which has square pyramidal geometry. ' X' is$ (1) $XeO_{3}$ (2) $XeO_{4}$ (3) $XeOF_{4}$ (4) $XeO_{2} F_{2}$ 229. $When concentrated H_{2} SO_{4} is heated with P_{2} O_{5}, the acid is converted into$ (1) $a mixture of sulphur dioxide and sulphur trioxide$ (2) $sulphur trioxide$ (3) $sulphur dioxide$ (4) $sulphur.$ 230. $The alkaline earth metal sulphate(s) which are readily soluble in water is/are: (A) B e S O_{4} (B) M g S O_{4} (C) C a S O_{4} (D) S r S O_{4} (E) B a S O_{4} Choose the correct answer from the options given below:$ (1) $A only$ (2) $B only$ (3) $A and B$ (4) $B and C$ 231. $The atomic radius of gallium is less than that of aluminium. This is due to$ (1) $Greater shielding power of s-electrons of gallium atom$ (2) $poor shielding power of s-electrons of gallium$ (3) $Poor shielding power of d-electrons of gallium$ (4) $Greater shielding power of d-electrons of gallium$ 232. $For per gram of reactant, the maximum quantity of N_{2} gas is produce in which of the following thermal decomposition reactions ?$ (1) $(NH4)2Cr2O7(s) \to N2(g) + 4H2O(g) + Cr2O3(s)$ (2) $2NH4NO3(s) \to 2N2(g) + 4H2O(g) + O2(g)$ (3) $Ba(N3)2(s) \to Ba(s) + 3N2(g)$ (4) $2NH3(g) \to N2(g) + 3H2(g)$ 233. $Sulphur dioxide reacts with chlorine in the presence of charcoal to give$ (1) $H_{2} SO_{3}$ (2) $SOCl_{2}$ (3) $SO_{2} Cl_{2}$ (4) $H_{2} SO_{4}$ 234. $Complete hydrolysis of XeF_{4} and XeF_{6} gives its oxides P and Q, respectively. Identify P and Q . P Q$ (1) $XeO_{2} XeO_{3}$ (2) $XeO XeO_{2}$ (3) $XeO_{3} XeO_{3}$ (4) $XeO_{2} XeO_{2}$ 235. $Sodium metal on dissolution in liquid ammonia gives a deep blue solution due to the formation of:$ (1) $sodium-ammonia complex$ (2) $sodamide$ (3) $sodium ion-ammonia complex$ (4) $ammoniated electrons$ 236. $Among the following the correct statements are I. Germanium exists only in traces II. PbF_{4} molecule is tetrahedral in shape III. GeX_{2} is more stable than GeX_{4}$ (1) $II, III only$ (2) $I, II only$ (3) $I, II, III$ (4) $I, III only$ 237. $Which compound will show the highest lattice energy?$ (1) $R b F$ (2) $C s F$ (3) $N a F$ (4) $KF$ 238. $The correct order of hydration enthalpies of alkali metal ions is:$ (1) $L i^{+} > N a^{+} > K^{+} > C s^{+} > R b^{+}$ (2) $N a^{+} > L i^{+} > K^{+} > R b^{+} > C s^{+}$ (3) $N a^{+} > L i^{+} > K^{+} > C s^{+} > R b^{+}$ (4) $L i^{+} > N a^{+} > K^{+} > R b^{+} > C s^{+}$ 239. $Select wrong chemical reaction among the following:$ (1) $MnO_{2} + 4 HCl ⟶ MnCl_{2} + Cl_{2} + 2 H_{2} O$ (2) $8 NH_{3} + 3 Cl_{2} ⟶ 6 NH_{4} Cl + N_{2}$ (3) $2 NaOH + Cl_{2} ⟶ 2 NaCl + H_{2} + O_{2}$ (4) $2 Ca (OH)_{2} + 2 Cl_{2} ⟶ Ca (OCl)_{2} + CaCl_{2} + 2 H_{2} O$ 240. $Manganese dioxide on heating with concentrated hydrochloric acid gives a greenish yellow gas, X . With excess of ammonia X gives Y and Z . Y and Z respectively are$ (1) $NH_{4} F, N_{2}$ (2) $NH_{4} I, NOCl$ (3) $NCl_{3}, HOCl$ (4) $NH_{4} Cl, N_{2}$