s-Block Elements PYQs Set 4 (PDF)

Set 4 of 20 · Questions 91-120 of 584

In the print window choose “Save as PDF”. The file prints without a web address or date line.

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