Question

Element $M{\text{ }} + {\text{ }}{N_2}\xrightarrow{{\Delta ,{\text{ }}{H_2}O}}N{H_3}$
Element M belonging to group 13 can be?
A. $B$ or $Al$
B. $Ga$ or $Al$
C. $B$ or $Ga$
D. $In$ or $Tl$

Answer 1

We must know about the reactivity of metals presents in group 13.The compound $M{N_2}$ in the presence of water and heat will convert to ammonia which is $N{H_3}$. Therefore, the metals have 3 electrons in its valence shell.

Complete step by step answer:
Let’s discuss how the reaction will go in this question, when the group 13 elements react with ${N_2}$ they will form a molecule which will generally be like $M{N_2}$. The compound $M{N_2}$ in the presence of water and heat will convert to ammonia which is $N{H_3}$.
The only two elements in group 13 which shows such character are boron and aluminium. Boron reacts with nitrogen gas to form $2BN$ which converts to ammonia in the presence of water and heat. Similarly, Aluminium reacts with nitrogen to give $2AlN$ which converts to ammonia in the presence of water and heat. Both the reactions are given below:
For Boron,
$2B + {N_2} \to {\text{2}}BN$
For Aluminium,
$2Al + {N_2} \to {\text{2}}AlN$

So, the correct answer is Option A.

Note: Group 13 elements have 3 electrons in its valence shell.
Also, these metals are present in the P block of periodic table.
It contains radioactive elements as well like Indium and Thallium.
Group is also known as boron group as well.
We must know that the Group 13 contains one of most used metal on earth i.e. aluminium. Aluminium is used in many places nowadays since it’s ductile, malleable and light in weight as compared to steel. But aluminium oxidises faster as compared to steel, this happens due to aluminium’s affinity towards oxygen.