S Block Elements Question 251
Question: A metal M reacts with $ N_2 $ to give a compound ‘A’ $ (M_3N) $ . ‘A’ on heating at high temperature gives back ‘M’ and ‘A’ on reacting with $ H_2O $ gives a gas ‘B’. ‘B’ turns $ CuSO_4 $ solution blue on passing through it. A and B can be
[DCE 2003]
Options:
A) Al and $ NH_3 $
B) Li and $ NH_3 $
C) Na and $ NH_3 $
D) Mg and $ NH_3 $
Show Answer
Answer:
Correct Answer: B
Solution:
Lithium form nitride on heating with nitrogen. Lithium nitride gives ammonia when heated with $ H_2O $ . Ammonia gas form tetrammine copper complex with $ CuSO_4 $ solution. $ 6Li+N_2\to 2Li_3N $
$ Li_3N+3H_2O\to 3LiOH+NH_3 $
$ CuSO_4+4NH_3\to [Cu{{(NH_3)}_4}]SO_4 $
BETA
