Discussion Forum



1)

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


A) $Bi_{2}O_{5}$ 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:

Option (A,B,C)

Explanation:

Statement wise  explanation is

(i) Statement (a)  Bi2O5  is metallic oxide while N2O5 is a non-metallic oxide.

           Metallic oxides being ionic are basic in nature while non metallic oxides being covalent are acidic in nature. This confirms more basic nature of Bi2O5 in comparison to N2O5 .Hence this is correct statement.

(ii) Statement (b)  The electronegativity difference between N(3) and F(4) is less as compared to the electronegativity difference between Bi(1.7) and F(4). More electronegativity difference leads to ionic compounds. Thus, NF3  must be more covalent in nature as compared to BiF3 .Hence, this statement is also correct.

(iii) Statement (c) In NH3 intermolecular hydrogen bonding is present, which is altogether absent in PH3 .Thus , PH3 boils at lower temperature than NH3. Hence, this is also a correct statement.

(IV) Statement (d)  Due to smaller size of N the lone pair-lone pair repulsion is  more in N-N single bond as compared to P-P single bond. This results to weaker N-N single bond as compared to P-P single bond. Hence, this statement is incorrect.