Question: Based on the compounds of group 15 elements, the correct statement(s) is (are): A.\[B{i_2}{O_5}\] ...

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 a lower temperature than $N{H_{_3}}$
D.The $N - N$ single bond is stronger than the $P - P$ single bond

Answer 1

Solution

To answer this question, you should recall the formation of the periodic table. Group 15 elements are also known as the Nitrogen family which includes the elements: nitrogen, phosphorus, arsenic, antimony and bismuth.

Complete step by step answer:
As you move down a group, starting with the lightest element and finishing with the heavy ones; you would notice a general flow in properties as you move down the order.
For example, Nitrogen is a gas and non-metal but as you move down the group, we encounter metalloids and then at the bottom, metal i.e. Bismuth.
Let us analyze the options systematically:
(A) $B{i_2}{O_5}$ is metallic oxide but ${N_2}{O_5}$ is a non-metallic oxide, therefore, $B{i_2}{O_5}$ is basic but ${N_2}{O_5}$ is acidic.
(B) In $N{F_3}$ , ${\text{N}}$ and ${\text{F}}$ are non-metals but $Bi{F_3},{\text{ Bi}}$ is metal but F is not 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 a lower temperature than $N{H_3}$ .
(D) Due to small size in $N - N\;$ single bond $2p - 2p\;$ repulsion is more than $P - P\;$ single bond therefore $N - N\;$ single bond is weaker than the $P - P\;$ single bond.

Hence, option A, B and C are correct.

Note:
There are 4 blocks in the periodic table: s-block, p-block, d-block and f-block. All of the s-block elements are metals. Usually, they are shiny, silvery, good conductors of heat and electricity, and lose their valence electrons easily. The p-block due to its ability to accommodate a large number of electrons has the biggest variety of elements and is the only block that contains three types of elements: metals, nonmetals and metalloids. d-block elements have properties that are between s-block elements and p-block elements properties. It consists of transition metals. The f-block elements are mostly radioactive.