JEE Main On 8 April 2017 Question 30
Question: A metal ‘M’ reacts with nitrogen gas to afford $ ‘M _3N’.‘M _3N’ $ on heating at high temperature gives back ‘M’ and on reaction with water produces a gas ‘B’. Gas ‘B’ reacts with aqueous solution of $ CuSO _4 $ to form a deep blue compound. ‘M’ and ‘B’ respectively are : [JEE Online 08-04-2017]
Options:
A) Li and $ NH _3 $
B) Na and $ NH _3 $
C) Ba and $ N _2 $
D) Al and $ N _2 $
Show Answer
Answer:
Correct Answer: A
Solution:
- Li and $NH_3 $
The metal ‘M’ forms nitride M3N. Since N has valency 3, metal ‘M’ has valence 1. Hence, ‘M’ can be either Li or Na. So we can rule out Ba and Al.
