s-Block Elements PYQs Set 7 (PDF)

Set 7 of 20 · Questions 181-210 of 573

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Mere Teacher · Previous Year Questions NEET Chemistry · s-Block Elements · Set 7 (Q181-210)
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181. $When compared with alkaline earth metals, the alkali metals have$ (1) $Greater hardness$ (2) $Higher boiling points$ (3) $Smaller ionic radii$ (4) $Lower ionization enthalpy$ 182. $Assertion (A) : AlCl3 exists as a dimer through halogen bridged bonds.Reason (R) : AlCl3 gets stability by accepting electrons from the bridged halogen.$ (1) $Both (A) and (R) are true and (R) is the correct explanation of (A)$ (2) $Both (A) and (R) are true but (R) is not the correct explanation of (A)$ (3) $(A) is true, but (R) is false$ (4) $(A) is false, but (R) is true$ 183. $Extraction of chlorine from brine solution is based on$ (1) $acidification$ (2) $reduction$ (3) $oxidation$ (4) $chlorination.$ 184. $Which one of the following statements is correct?$ (1) $N_{2} is a brown coloured gas$ (2) $O_{3} is thermodynamically stable compared to oxygen$ (3) $Rhombic sulphur is stable at room temperature$ (4) $Cl_{2} is a colourless gas$ 185. $In the preparation of chlorine by the electrolysis of brine, the reaction taking place at the anode is:$ (1) $C l^{-} (a q) \to \frac{1}{2} C l_{2} (g) + e^{-}$ (2) $Na^{+} (aq) + e^{-} \to Na (s)$ (3) $O_{2} (g) + 4 H^{+} + 4 e^{-} \to 4 H_{2} O (l)$ (4) $H^{+} (a q) + e^{-} \to \frac{1}{2} H_{2} (g)$ 186. $'The property which is not true about fluorine is$ (1) $most of its reactions are exothermic$ (2) $it forms only one oxo acid$ (3) $highest electronegativity$ (4) $high F-F bond dissociation enthalpy.$ 187. $The compound that is used in smoke screens is$ (1) $Mg_{3} N_{2}$ (2) $MgO$ (3) $NaN_{3}$ (4) $Ca_{3} P_{2}$ 188. $Alkali metals are powerful reducing agents because$ (1) $they are metals$ (2) $they are monovalent$ (3) $their ionic radii are large$ (4) $their ionisation energies are low$ 189. $Which of the following complex ions does not exist?$ (1) $(B (H_{2} O)_{6})^{3 +}$ (2) $(Al (H_{2} O)_{6})^{3 +}$ (3) $(Ga (H_{2} O)_{6})^{3 +}$ (4) $(ln (H_{2} O)_{6})^{3 +}$ 190. $Among C a H_{2}, B e H_{2}, B a H_{2}, the order of ionic character is$ (1) $B e H_{2} < C a H_{2} < B a H_{2}$ (2) $C a H_{2} < B e H_{2} < B a H_{2}$ (3) $B e H_{2} < B a H_{2} < C a H_{2}$ (4) $B a H_{2} < B e H_{2} < C a H_{2}$ 191. $Alkali metals have negative reduction potential and hence they behave as$ (1) $oxidising agents$ (2) $Lewis bases$ (3) $reducing agents$ (4) $electrolytes.$ 192. $Match the following List I A. Carbon black B. Graphite C. Diamond D. Activated charcoal List II I. Electrodes in batteries II. Extraction of metals III. Abrasive IV. Filler in automobile Tyres V. Air conditioning System$ (1) $A-IV B-III C-II D-$ (2) $A-III B-I C-II D-IV$ (3) $A-V B-I C-III D-II$ (4) $A-IV B-I C-III D-V$ 193. $The correct order of boiling points of H_{2} O, H_{2} S, H_{2} Se and H_{2} Te respectively is$ (1) $H_{2} O > H_{2} S = H_{2} Se = H_{2} Te$ (2) $H_{2} O < H_{2} S < H_{2} Se < H_{2} Te$ (3) $H_{2} O > H_{2} S > H_{2} Se > H_{2} Te$ (4) $H_{2} O > H_{2} Te > H_{2} Se > H_{2} S$ 194. $The structures of BCl_{3} and BCl_{3} \cdot NH_{3}, respectively are$ (1) $Planar trigonal and Tetrahedral$ (2) $Planar trigonal and Pyramidal$ (3) $Pyramidal and Tetrahedral$ (4) $Pyramidal and Pyramidal$ 195. $Which one of the following has minimum value of cation/anion ratio?$ (1) $N a C l$ (2) $KCl$ (3) $M g C l_{2}$ (4) $C a F_{2}$ 196. $Which is the most easily liquefiable rare gas?$ (1) $Ar$ (2) $Ne$ (3) $Xe$ (4) $Kr$ 197. $Assertion (A) : K, Rb and Cs form superoxides. Reason (R) : The stability of superoxides increases from K to Cs due to decrease in lattice energy.$ (1) $Both A and R are true and R is a correct explanation of A .$ (2) $Both A and R are true but R is not a correct explanation of A .$ (3) $A is true but R is false.$ (4) $A is false but R is true.$ 198. $Carbon and germanium belong to the 14^{th} group. The maximum coordination number of carbon is less than germanium, because of$ (1) $larger size of germanium$ (2) $electronegativity difference$ (3) $availability of low-lying d -orbitals in germanium$ (4) $electrical conductivity$ 199. $Δ H_{f}^{\circ} values (in kJ mol^{- 1}) for graphite, diamond and C_{60} are respectively$ (1) $0; 1.9; 38.1$ (2) $1.8; 1.9; 38.1$ (3) $0; 0; 21.4$ (4) $1.8; 1.9; 2.0$ 200. $Property of the alkaline earth metals that increases with their atomic number is :$ (1) $ionisation energy$ (2) $solubility of their hydroxides$ (3) $solubility of their sulphates$ (4) $electronegativity$ 201. $The major component/ingredient of Portland Cement is:$ (1) $tricalcium aluminate$ (2) $tricalcium silicate$ (3) $dicalcium aluminate$ (4) $dicalcium silicate$ 202. $Property of the alkaline earth metals that increases with their atomic number$ (1) $solubility of their hydroxides in water$ (2) $solubility of their sulphates in water$ (3) $ionization energy$ (4) $electronegativity$ 203. $The standard electrode potential (in V) values for Al^{3 +} / Al, Tl^{3 +} / T 1 are respectively$ (1) $- 1.66, - 1.26$ (2) $+ 1.66, + 1.26$ (3) $- 1.66, + 1.26$ (4) $+ 1.66, - 1.26$ 204. $The reaction of H_{3} N_{3} B_{3} C l_{3} (A) with LiB H_{4} in tetrahydrofuran gives inorganic benzene (B) . Further, the reaction of (A) with (C) leads to H_{3} N_{3} B_{3} (Me)_{3} .Compounds (B) and (C) respectively, are:$ (1) $Boron nitride and MeBr$ (2) $Borazine and MeMgBr$ (3) $Borazine and MeBr$ (4) $Diborane and MeMgBr$ 205. $Which of the following are not in accordance with the property mentioned against them? I . F_{2} > Cl_{2} > Br_{2} > I_{2} : Oxidising power II. Ml > MBr > MCl > MF : Ionic character of metal halide III. F_{2} > Cl_{2} > Br_{2} > I_{2} : Bond dissociation enthalpy IV. HI < HBr < HCl < HF : Hydrogen-halogen bond strength$ (1) $I & III only$ (2) $II & III only$ (3) $I & IV only$ (4) $II & IV only$ 206. $A metal on combustion in excess of air forms X. X upon hydrolysis with water yields H_{2} O_{2} and O_{2} along with another product. The metal is:$ (1) $Na$ (2) $Rb$ (3) $Mg$ (4) $Li$ 207. $The metal that forms nitride by reacting directly with N_{2} of air, is:$ (1) $K$ (2) $Li$ (3) $Rb$ (4) $Cs$ 208. $Which of the following reaction gives nitrogen (II) oxide as one of the products?$ (1) $CU+ dil HNO_{3} \to$ (2) $CU+ conc. HNO_{3} \to$ (3) $Zn+ dil HNO_{3} \to$ (4) $Zn+ conc. HNO_{3} \to$ 209. $Which of the following salts can accommodate more number of H_{2} O molecules per molecule in their halide hydrates?$ (1) $BaCl_{2}$ (2) $MgCl_{2}$ (3) $CaCl_{2}$ (4) $SrCl_{2}$ 210. $Noble metals, like gold and platinum are soluble in which of the following mixtures?$ (1) $1 : 1 mixture of conc. HNO_{3} and conc. H_{2} SO_{4}$ (2) $1:3 mixture of conc. HCl and conc. HNO_{3}$ (3) $1:3 mixture of conc. HNO_{3} and conc. HCl$ (4) $1:3 mixture of conc. H_{2} SO_{4} and conc. HCl$