Which of the molecule is not hypovalent but complete octet :

1. AlCl₃                   

2. AlBr₃

3. AlF₃                     

4. BF₃

A molecule that has a complete octet is:

 1. BeCl₂(dimer)       

 2. BeH₂(dimer)

 3. BeH₂(s)               

 4. BeCl₂(s)

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

1. +6

2. +4

3. +1

4. +2

Formal charges of central atom in SO₃ , \(NO^-_3\)  and  \(NH^+_4\) are, respectively:

1. 0 , +1 , +1

2. +2 , +1 , +1

3. +2 , -1 , +1

4. 0, -1 , +1 

Which of the following attraction is strongest?

1.		2.
3.		4.

Overlap of which of the following atomic orbitals would be maximum to form the strongest covalent bond.

1. 1s-2s (σ)

2. 1s-2p (σ)

3. 2p-2p (π)

4. 2p-2p (σ)

Favourable conditions for electrovalency are:

On the left are given decreasing orders of elements for a certain property and on the right side is given the property. The incorrect order for the given properties is:

1. ${\mathrm{AlF}}_3>\mathrm{MgO}>{\mathrm{MgF}}_2$    : Lattice energy

2. $\mathrm{Li}>\mathrm{Na}>\mathrm{Al}>\mathrm{Mg}$       : Electron affinity

3. ${\mathrm{PF}}_5>$ ${\mathrm{SF}}_6$ $>$ ${\mathrm{SiF}}_4$      : Lewis acidic character

4. ${\mathrm{SiCl}}_4>{\mathrm{SiBr}}_4$ $>{\mathrm{SiI}}_4$   : Decreasing ionic character