Question

Calcium imide on hydrolysis gives gas (P) which on oxidation by bleaching powder gives gas (Q), Gas (Q) on reaction with magnesium gives compound (R) which on hydrolysis again gives gas (P). Identify (P), (Q), and (R):

A.  $ { N }_{ 2 }{ ,NH }_{ 3 }{ ,MgNH } $ 

B.  $ { NH }_{ 3 }{ ,N }_{ 2 }{ ,NH }_{ 3 }{ ,Mg }_{ 3 }{ N }_{ 2 } $ 

C.  $ { NH }_{ 3 }{ ,NO }_{ 2 }{ ,Mg(NO }_{ 2 }{ ) }_{ 2 } $ 

D.  $ { N }_{ 2 }{ { N }_{ 2 }O }_{ 5 }{ ,Mg(NO }_{ 3 }{ ) }_{ 2 } $ 

Answer 1

Hint: The chemical formula of bleaching powder is  $ { CaOCl }_{ 2 } $ 

Hydrolysis: It is a chemical process in which a molecule of water is added in a substance.

Oxidation: The substance that gives away electrons is oxidized and the reactions are called oxidation reactions.

Complete step by step answer:

The following reactions will take place as follows:

Calcium imide on hydrolysis gives gas  $ { NH }_{ 3 }and { Ca(OH) }_{ 2 } $ 

 $ { CaNH+2H }_{ 2 }{ O\rightarrow { NH }_{ 3 } }{ +Ca(OH) }_{ 2 } $ 

When we oxidize  $ { NH }_{ 3 } $  with bleaching powder then it gives  $ { N }_{ 2 } $  gas and other byproducts.

 $ { 3CaOCl }_{ 2 }{ +2NH }_{ 3 }{ \rightarrow { 3CaCl }_{ 2 } }{ +3H }_{ 2 }{ O+N }_{ 2 } $ 

Now, when magnesium reacts with  $ { N }_{ 2 } $  then the compound  $ { Mg }_{ 3 }{ N }_{ 2 } $  will be formed.

 $ { N }_{ 2 }{ +3Mg\rightarrow { Mg }_{ 3 } }{ N }_{ 2 } $ 

And when  $ { Mg }_{ 3 }{ N }_{ 2 } $  gets hydrolyzed then it gives  $ { NH }_{ 3 } $ .

 $ { { Mg }_{ 3 } }{ N }_{ 2 }{ +6H }_{ 2 }{ O\rightarrow 3Mg(OH) }_{ 2 }{ +2NH }_{ 3 } $ 

So, we can say that when calcium imide on hydrolysis gives gas  $ { NH }_{ 3 } $ (P) which on oxidation by bleaching powder gives gas  $ { N }_{ 2 } $ (Q), Gas  $ { N }_{ 2 } $  on reaction with magnesium gives compound  $ { Mg }_{ 3 }{ N }_{ 2 } $  (R) which on hydrolysis again gives gas  $ { NH }_{ 3 } $  (P).

Hence, the correct option is (B).

Note: The possibility of making a mistake is that it does not expose the calcium imide as it is sensitive to light and it turns dark brown in color. Hydrolysis is widely used in industry to break down chemicals into smaller fractions.

Oxidation is widely used in industries like in the production of cleaning products.