CaO and NaCl have the same crystal structure and approximately the same ionic radii. If U is the lattice energy of NaCl, the approximate lattice energy of CaO is :-

1. U/2 

2. U 

3. 2 U 

4. 4 U

Which of the following sequences represents the increasing order of the polarizing power of the cationic species?

K⁺, Ca⁺², Mg⁺², Be⁺²

1. Be⁺² < K⁺ < Ca⁺² < Mg⁺² 

2. K⁺ < Ca⁺² < Mg⁺² < Be⁺²

3. Ca⁺² < Mg⁺² < Be⁺² < K⁺ 

4. Mg⁺² < Be⁺² < K⁺ < Ca⁺²

Which of the following is the correct order of dipole moment?

1. $N{H}_3<B{F}_3<N{F}_3<H_{2}O$

2. $B{F}_3<N{F}_3<N{H}_3<H_{2}O$

3. $B{F}_3<N{H}_3<N{F}_3<H_{2}O$

4. $H_{2}O<N{F}_3<N{H}_3<B{F}_3$

The compound that does not contain an ionic bond is:

1. NaOH

2. HCl

3. K₂S

4. LiH

Which of the following is an example of super octet molecule?

1. ClF₃

2. PCl₅

3. IF₇

4. All the three

In bisulphate ion, HSO₄^-, the formal charge on S atom is

1. +6

2. +4

3. +1

4. +2

An atom of the element A has 3 electrons in its outermost shell while another atom X has 6 electrons in its outermost shell. The formula of the compound between A and X could be :

1. A₂X₃

2. AX₃

3. A₃X₂

4. A₂X

In the electronic structure of acetic acid there are

1. 16 shared and 8 unshared electrons

2. 8 shared and 16 unshared electrons

3. 12 shared and 12 unshared electrons

4. 18 shared and 6 unshared electrons

Among the following isostructural compounds, which one has highest lattice energy ?

1. LiCl

2. MgO

3. NaCl

4. LiF

NH₃ and BF₃ form adduct readily because they form

1. Ionic bond

2. Covalent bond

3. Co-ordinate bond

4. Hydrogen bond