Chemical Bonding and Molecular Structure

In X-H Y, X and Y both are electronegative elements. Then

1. electron density on X will increase and on H will decrease
2. in both electron density will increase
3. in both electron density will decrease
4. on X electron density will decrease and on H will increase.

d - p bond present in

1. CO32-
2. PO43-
3. NO3-
4. NO2-

Right order of dissociation energy N2 and N2+ is

1. N2 > N2+
2. N2 = N2+
3. N2+ > N2
4. none

Which species does not exhibit paramagnetism?

1. N2+
2. O2-
3. CO
4. NO

Which compound forms linear polymer due to H-bond?

1. H2O
2. NH3
3. HF
4. HCl