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

A $\sigma$ bonded molecule MX₃ is T-shaped. The number of non-bonding pairs of electrons is:

1. 0

2. 2

3. 1

4. Can be predicted only if atomic number of M is known

The hybrid state of S in SO₃ is similar to that of

1. C in C₂H₂

2. C in C₂H₄

3. C in CH₄

4. C in CO

Compound in which central atom assumes sp³d hybridisation is

1. SO₃

2. PCl₅

3. SO₂

4. PCl₃

In a chemical change from PCl₃ $\to$ PCl₅ the hybrid state of P changes from :

1. sp² to sp³

2. sp³ to sp²

3. sp³ to sp³d

4. sp³ to dsp

The shape of covalent molecule AX₃ is: