p-Block Elements (Group 15–18)

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)

Identify the incorrect statement related to PCl5 from the following :

1. Axial P–Cl bonds are longer than equatorial P–Cl bonds
2. PCl5 molecule is non-reactive
3. Three equatorial P–Cl bonds make an angle of 120° with each other
4. Two axial P–Cl bonds make an angle of 180° with each other

Match the Xenon compounds in Column-I with its structure in Column-II and assign the correct code :

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

Which of the following statements is not true for halogens?

1. All are oxidizing agents.
2. All form monobasic oxyacids.
3. All but fluorine show positive oxidation states.
4. Chlorine has the highest electron-gain enthalpy.