s-Block Elements PYQs Set 4 (PDF)

Set 4 of 20 · Questions 91-120 of 573

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Mere Teacher · Previous Year Questions NEET Chemistry · s-Block Elements · Set 4 (Q91-120)
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91. $Chlorine oxidises sulphur dioxide in the presence of water to give an oxyacid A . Chlorine also oxidises iodine in the presence of water to give an oxyacid B . The oxidation states of S and I in A and B are respectively$ (1) $+ 4, + 5$ (2) $+ 6, + 3$ (3) $+ 6, + 5$ (4) $+ 4, + 7$ 92. $Ammonia on reaction with chlorine forms an explosive NCl_{3} . What is the mole ratio of NH_{3} and Cl_{2} required for this reaction?$ (1) $8 : 3$ (2) $1 : 1$ (3) $1 : 3$ (4) $10 : 1$ 93. $The reaction of zinc with dilute and concentrated nitric acid, respectively, produces:$ (1) $N O_{2} and NO$ (2) $NO and N_{2} O$ (3) $N O_{2} and N_{2} O$ (4) $N_{2} O and N O_{2}$ 94. $The minimum temperature required for a non catalytic reaction between N_{2} and O_{2} is$ (1) $3000 K$ (2) $2000 K$ (3) $1000 K$ (4) $500 K$ 95. $The correct order of conductivity of ions in water is :$ (1) $Na^{+} > K^{+} > Rb^{+} > Cs^{+}$ (2) $Cs^{+} > Rb^{+} > K^{+} > Na^{+}$ (3) $K^{+} > Na^{+} > Cs^{+} > Rb^{+}$ (4) $Rb^{+} > Na^{+} > K^{+} > Li^{+}$ 96. $Which one of the following oxoacids of phosphorus can reduce AgNO_{3} to metallic silver?$ (1) $H_{3} PO_{2}$ (2) $H_{4} P_{2} O_{7}$ (3) $H_{4} P_{2} O_{6}$ (4) $H_{3} PO_{4}$ 97. $The correct statements with respect to halides of group 14 elements are I. Both CCl_{4} and SiCl_{4} undergo hydrolysis II. GeX_{4} is more stable than GeX_{2} III. PbX_{4} is less stable than PbX_{2} IV. Stability of dihalides decreases down the group.$ (1) $I, IV only$ (2) $II, IV only$ (3) $II, III only$ (4) $III, IV only$ 98. $Metallic sodium does not react normally with :$ (1) $gaseous ammonia$ (2) $But-2-yne$ (3) $Ethyne$ (4) $tert-butyl alcohol$ 99. $In which of the following processes, fused sodium hydroxide is electrolysed at a 330 C temperature for extraction of sodium?$ (1) $Castner’s process$ (2) $Down’s process$ (3) $Cyanide process$ (4) $Both (b) and (c)$ 100. $Sodium is made by the electrolysis of a molten mixture of about 40% N a C l and 60% C a C l_{2} because$ (1) $C a^{++} can reduce N a C l to Na$ (2) $C a^{++} can displace Na from N a C l$ (3) $C a C l_{2} helps in conduction of electricity$ (4) $this mixture has a lower melting point than N a C l .$ 101. $Which one of the following alkaline earth metal ions has the highest ionic mobility in its aqueous solution?$ (1) $B e^{2 +}$ (2) $M g^{2 +}$ (3) $C a^{2 +}$ (4) $S r^{2 +}$ 102. $The pair of elements that form both oxides and nitrides, when burnt in air are$ (1) $Na, Mg$ (2) $Na, Be$ (3) $Mg, Ca$ (4) $Be, Mn$ 103. $Which of the following atoms will have the smallest size?$ (1) $Mg$ (2) $Na$ (3) $Be$ (4) $Li$ 104. $Regular use of which of the following fertilizers increases the acidity of soil?$ (1) $Superphosphate of lime$ (2) $Ammonium sulphate$ (3) $Potassium nitrate$ (4) $Urea$ 105. $Match List-I with List II List - I (Salt) (A) LiCl (B) NaCl (C) RbCl (D) CsCl List-II (Flame colour wavelength) (i) 455.5 nm (ii) 970.8 nm (iii) 780.0 nm (iv) 589.2 nm Choose the correct answer from the options given below :$ (1) $(A) - (ii),(B) - (i),(C) - (iv),(D) - (iii)$ (2) $(A) - (ii),(B) - (iv),(C) - (iii),(D) - (i)$ (3) $(A) - (iv),(B) - (ii),(C) - (iii),(D) - (i)$ (4) $(A) - (i),(B) - (iv),(C) - (ii),(D) - (iii)$ 106. $Identify the correct statements about Boron. I. It has high melting point. II. It has high density. III. It has high electrical conductivity IV. B-10 isotope of it has high ability to absorb neutrons$ (1) $I, II only$ (2) $II, III only$ (3) $III, IV only$ (4) $I, IV only$ 107. $How many nearest neighbours are there for Si and O atoms in quartz crystals?$ (1) $4 (Si); 2 (O)$ (2) $4 (Si); 4 (O)$ (3) $2 (Si); 2 (O)$ (4) $3 (Si); 2 (O)$ 108. $What are x and y in the following reaction? xPb_{3} O_{4} \to yPbO + O_{2}$ (1) $x = 3, y = 6$ (2) $x = 2, y = 4$ (3) $x = 2, y = 5$ (4) $x = 2, y = 6$ 109. $Which of the following source materials generate SO_{2} that is used in contact process?$ (1) $S, FeS_{2}$ (2) $S, FeS$ (3) $H_{2} S, FeS_{2}$ (4) $Na_{2} S, FeS_{2}$ 110. $The correct order of increasing thermal stability of K_{2} C O_{3}, M g C O_{3}, C a C O_{3} and B e C O_{3} is$ (1) $B e C O_{3} < M g C O_{3} < C a C O_{3} < K_{2} C O_{3}$ (2) $M g C O_{3} < B e C O_{3} < C a C O_{3} < K_{2} C O_{3}$ (3) $K_{2} C O_{3} < M g C O_{3} < C a C O_{3} < B e C O_{3}$ (4) $B e C O_{3} < M g C O_{3} < K_{2} C O_{3} < C a C O_{3}$ 111. $Both lithium and magnesium display several similar properties due to the diagonal relationship; however, the one which is incorrect, is :$ (1) $both form soluble bicarbonates$ (2) $both form nitrides$ (3) $nitrates of both Li and Mg yield N O_{2} and O_{2} on heating$ (4) $both form basic carbonates$ 112. $K O_{2} (potassium super oxide) is used in oxygen cylinders in space and submarines because it :$ (1) $Absorbs C O_{2} and increases O_{2} contents$ (2) $Eliminates moisture$ (3) $Absorbs C O_{2}$ (4) $Produces ozone$ 113. $Which among the following is the strongest acid?$ (1) $HF$ (2) $HCl$ (3) $HBr$ (4) $HI$ 114. $Which one of the following is correct with respect to basic character?$ (1) $P (CH_{3})_{3} > PH_{3}$ (2) $PH_{3} > P (CH_{3})_{3}$ (3) $PH_{3} > NH_{3}$ (4) $PH_{3} = NH_{3}$ 115. $In the reaction, B (OH)_{3} + 2 H_{2} O ⟶ (B (OH)_{4})^{-} + H_{3} O^{+} B (OH)_{3} functions as$ (1) $protonic acid$ (2) $Lewis base$ (3) $Bronsted acid$ (4) $Lewis acid.$ 116. $In which ofthe following the hydration energy is higher than the lattice energy?$ (1) $M g S O_{4}$ (2) $R a S O_{4}$ (3) $S r S O_{4}$ (4) $B a S O_{4}$ 117. $Which of the following metals is used as catalyst in manufacture of sulphuric acid by Contact process?$ (1) $Iron$ (2) $Platinum$ (3) $Nickel$ (4) $Cobalt$ 118. $Which of the following set of metals have strong tendency to form super oxides?$ (1) $Li, Na, Be$ (2) $Be, Mg, Ca$ (3) $K, Rb, Cs$ (4) $Li, Be, Mg$ 119. $Which of the following statement(s) is (are) correct? (i) LiF is less soluble in water (ii) NaCl is less ionic than CsCl (iii) Formation of alkali metal halide is an endothermic reaction$ (1) $i & ii only$ (2) $i, ii & iii$ (3) $ii & iii only$ (4) $i only$ 120. $Which one of the following elements does not form triiodide on reacting with iodine?$ (1) $B$ (2) $Tl$ (3) $Al$ (4) $Ga$