Question

Based on the compounds of group $15$ elements, the correct statement(s) is (are)

• A. $B{i}_2{O}_5$ is more basic than $N_2{O}_5$
• B. $N{F}_3$ is more covalent than $Bi{F}_3$
• C. $P{H}_3$ boils at lower temperature than $N{H}_3$
• D. The $N-N$ single bond is stronger than the $P-P$ single bond

Answer 1

Answer: (A), (B), (C)

(A) $B{i}_2{O}_5$ is metallic oxide but $N_2{O}_5$ is non metallic oxide therefore $B{i}_2{O}_5$ is basic but $N_2{O}_5$ is acidic.
(B) In $N{F}_3$ , N and F are non metals but $Bi{F}_3$ , Bi is metal but F is non metal therefore $N{F}_3$ is more covalent than $Bi{F}_3$.
(C) In $P{H}_3$ hydrogen bonding is absent but in $N{H}_3$ hydrogen bonding is present therefore $P{H}_3$ boils at lower temperature than $N{H}_3$.
(D) Due to small size in N-N single bond l.p. - l.p. repulsion is more than P-P single bond therefore N-N single bond is weaker than the P-P single bond.