Question

**S1 :**The polarising power of a cation and polarisability of an anion, both are directly proportional to their sizes.

S2 : H2+ and He2+ have same bond order but H2+ is more stable than He2+ .

S3 : The strength of hydrogen bond does not depend at all on the availability of the lone pair of electrons on the atom forming H-bond.

S4 : OF2 and Cl2Oboth are sp3hybridised and bond angle in Cl2O is greater than 109⁰28’.

• A. T F F T
• B. F FF T
• C. F T F T
• D. T TTT

Answer 1

Answer: (B)

F FF T

Answer 2

S1 : Polarising power of a cation is inversely proportional to its size.

S2 : H2+ : s1s1 B.O. = $\frac{1}{2}$

He2+ : s1s2 s1s1 B.O. = $\frac{1}{2}$

But He2+ has electron in antibonding molecular orbital so its is unstable.

S3 : H-bond formation requires the availability of lone pair of electron.

S4 : In Cl2O, the bond angle is more than 109⁰28’ due to steric repulsion.