Question

Match the column I with column II and mark the appropriate choice.

	Column I		Column II
(A)	Laughing gas	(i)	Hydrazoic acid
(B)	Anhydride of $HN{O}_3$	(ii)	Nitrous oxide
(C)	Anhydride of $HP{O}_3$	(iii)	Nitrogen pentoxide
(D)	Acid hydride of nitrogen	(iv)	Phosphorus pentoxide

• A. $(A)\to (i)$, $(B)\to (ii)$, $(C)\to (iii)$, $(D)\to (iv)$
• B. $(A)\to (iv)$, $(B)\to (i)$, $(C)\to (ii)$, $(D)\to (iii)$
• C. $(A)\to (ii)$, $(B)\to (iii)$, $(C)\to (iv)$, $(D)\to (i)$
• D. $(A)\to (iii)$, $(B)\to (iv)$, $(C)\to (i)$, $(D)\to (ii)$

Answer 1

Answer: (C)

(A) Laughing Gas $⟶$ Nitrous oxide.
As this gas sometimes generates a feeling of euphoria due to which a person wants to laugh after smelling it.
(B) Anhydride of $HN{O}_3⟶$ anhydride means a compound obtained after water has been removed from other compounds.
From $HN{O}_3,H_{2}O$ can't be removed so, if we take $2\left(HN{O}_3\right)$
$⟶H_2{N}_2{O}_6\underset{H_{2}O}{\to }{N}_2{O}_5$ (nitrogen penta-oxide)
(C) Anhydride of $HP{O}_3$
Similarly as above if we take
$2\left[HP{O}_3\right]=H_2{P}_2{O}_6\stackrel{-H_{2}O}{\to }{P}_2{O}_5$ (Phosphorus Pentaoxide)
(D) Acid Anhydride of nitrogen.
Acid Anhydride is formed by the combination of two acid structures with an ion of a water molecule.
Hydrazine reacts with nitrous acid giving acid anhydride of nitrogen, i.e, hydrazoic acid with loss of 2 molecules of water.
$N_2{H}_4+HN{O}_2⟶H{N}_3+2H_{2}O$