p-Block Elements (Group 15–18) · Question 12

Which of the following reactions is a part of the large scale industrial preparation of nitric acid?

1. Cu(NO3)2 + 2NO2 + 2H2O [500 K, 9 bar]Pt 4HNO3 + Cu
2. NaNO3 + H2SO4 [500 K, 9 bar]Pt NaHSO4 + HNO3
3. 4NH3 + 5O2 (from air) [500 K, 9 bar]Pt 4NO + 6H2O
4. 4HPO3 + 2N2O5 [500 K, 9 bar]Pt 4HNO3 + P4O10

Fluorine is a stronger oxidising agent than chlorine because : Choose the most appropriate answer from the options given :

1. B and C only
2. A and B only
3. A and C only
4. A and D only

In the light of the above statements, choose the correct answer from the options given below.

1. Statement I is incorrect but Statement II is true.
2. Both Statement I and Statement II are true.
3. Both Statement I and Statement II are false.
4. Statement I is correct but Statement II is false.

Noble gases are named because of their inertness towards reactivity. Identify an incorrect statement about them.

1. Noble gases have large positive values of electron gain enthalpy
2. Noble gases are sparingly soluble in water
3. Noble gases have very high melting and boiling points
4. Noble gases have weak dispersion forces

In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it?

1. CO2 < SiO2 < SnO2 < PbO2 : Increasing oxidizing order
2. HF < HCl < HBr < HI : Increasing acidic strength
3. H2O < H2S < H2Se < H2Te : Increasing pKa values
4. NH3 < PH3 < AsH3 < SbH3 : Increasing acidic character

Urea reacts with water to form A which will decompose to form B. B when passed through Cu2+(aq), deep blue colour solution C is formed. What is the formula of C from the following?

1. [Cu(NH3)4]2+
2. Cu(OH)2
3. CuCO3 Cu(OH)2
4. CuSO4

Which of the following oxoacid of sulphur has -O-O- linkage?

1. H2SO4, sulphuric acid
2. H2S2O8, peroxodisulphuric acid
3. H2S2O7, pyrosulphuric acid
4. H2SO3, sulphurous acid

The correct structure of tribromooctaoxide is :

1. [figure]
2. [figure]
3. [figure]
4. [figure]

Which is the correct thermal stability order for H2E (E = O, S, Se, Te and Po)?

1. H2Po < H2Te < H2Se < H2S < H2O
2. H2Se < H2Te < H2Po < H2O < H2S
3. H2S < H2O < H2Se < H2Te < H2Po
4. H2O < H2S < H2Se < H2Te < H2Po

Match the following : Which of the following is the correct option?

1. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
2. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
3. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
4. (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)