Group 16 - dioxygen, ozone, sulphur allotropes and sulphuric acid — practice questions

Question 1 · difficulty L2 · understanding

Given below are two statements : Statement I : The covalency of oxygen is generally two but it can exceed upto four. The oxidation state of oxygen in $\mathrm{SO}_2$ is -2 and in $\mathrm{OF}_2$ it is +2 . Statement II : The anomalous behaviour of oxygen when compared to the other elements of group 16 is due to its small size and high electronegativity. In the light of the above statements, choose the correct answer from the options given below

• A. Both Statement I and Statement II are true
• B. Both Statement I and Statement II are false
• C. Statement I is true but Statement II is false
• D. Statement I is false but Statement II is true

Question 2 · difficulty L2 · understanding

The large difference between the melting and boiling points of oxygen and sulphur may be explained on the basis of

• A. Atomicity
• B. Electron gain enthalpy
• C. Atomic size
• D. Electronegativity

Question 3 · difficulty L2 · understanding

Identify the correct statements about p-block elements and their compounds. (A) Non metals have higher electronegativity than metals. (B) Non metals have lower ionisation enthalpy than metals. (C) Compounds formed between highly reactive nonmetals and highly reactive metals are generally ionic. (D) The non-metal oxides are generally basic in nature. (E) The metal oxides are generally acidic or neutral in nature. Choose the correct answer from the options given below :

• A. (B) and (D) only
• B. (B) and (E) only
• C. (D) and (E) only
• D. (A) and (C) only

Question 4 · difficulty L2 · understanding

Given below are two statements: Statement I : $$\mathrm{S}_8$$ solid undergoes disproportionation reaction under alkaline conditions to form $$\mathrm{S}^{2-}$$ and $$\mathrm{S}_2 \mathrm{O}_3{ }^{2-}$$. Statement II : $$\mathrm{ClO}_4^{-}$$ can undergo disproportionation reaction under acidic condition. In the light of the above statements, choose the most appropriate answer from the options given below :

• A. Statement I is correct but statement II is incorrect
• B. Both statement I and statement II are incorrect
• C. Statement I is incorrect but statement II is correct
• D. Both statement I and statement II are correct

Question 5 · difficulty L2 · understanding

Which one of the following pairs is an example of polar molecular solids?

• A. $$\mathrm{HCl}(\mathrm{s}), \mathrm{AlN}(\mathrm{s})$$
• B. $$\mathrm{MgO}(\mathrm{s}), \mathrm{SO}_{2}(\mathrm{s})$$
• C. $$\mathrm{SO}_{2}(\mathrm{s}), \mathrm{NH}_{3}(\mathrm{s})$$
• D. $$\mathrm{SO}_{2}(\mathrm{s}), \mathrm{CO}_{2}(\mathrm{s})$$

Question 6 · difficulty L2 · understanding

$$\mathrm{K_2Cr_2O_7}$$ paper acidified with dilute $$\mathrm{H_2SO_4}$$ turns green when exposed to :

• A. Sulphur dioxide
• B. Sulphur trioxide
• C. Hydrogen sulphide
• D. Carbon dioxide

Question 7 · difficulty L2 · understanding

Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Activated charcoal adsorbs SO 2 more efficiently than CH 4 . Reason R : Gases with lower critical temperatures are readily adsorbed by activated charcoal. In the light of the above statements, choose the correct answer from the options given below.

• A. Both A and R are correct and R is the correct explanation of A.
• B. Both A and R are correct but R is NOT the correct explanation of A.
• C. A is correct but R is not correct.
• D. A is not correct but R is correct.

Question 8 · difficulty L2 · understanding

The total number of acidic oxides from the following list is NO, N 2 O, B 2 O 3 , N 2 O 5 , CO, SO 3 , P 4 O 10

• A. 3
• B. 4
• C. 5
• D. 6

Question 9 · difficulty L2 · understanding

Match List I with List II: List I List II (A) Sulphate (I) Pesticide (B) Fluoride (II) Bending of bones (C) Nicotine (III) Laxative effect (D) Sodium arsinite (IV) Herbicide Choose the correct answer from the options given below :

• A. A-II, B-III, C-IV, D-I
• B. A-IV, B-III, C-II, D-I
• C. A-III, B-II, C-I, D-IV
• D. A-III, B-II, C-IV, D-I

Question 10 · difficulty L2 · understanding

Sulphur dioxide is one of the components of polluted air. SO 2 is also a major contributor to acid rain. The correct and complete reaction to represent acid rain caused by SO 2 is :

• A. 2SO 2 + O 2 $$\to$$ 2SO 3
• B. SO 2 + O 3 $$\to$$ SO 3 + O 2
• C. SO 2 + H 2 O 2 $$\to$$ H 2 SO 4
• D. 2SO 2 + O 2 + 2H 2 O $$\to$$ 2H 2 SO 4