Question

The aqueous solution/liquid that absorbs nitric oxide to a considerable extent is:

• A. lead nitrate
• B. nitric acid
• C. ferrous sulphate
• D. sodium hydroxide

Answer 1

Answer: (C)

ferrous sulphate

Answer 2

The aqueous solution/liquid of ferrous sulphate $(FeS{{O}_{4}})$ absorbs nitric oxide to a considerable extent to give brown coloured
$FeS{{O}_{4}}.NO$ .
This is the ring test for identifying the
$NO_{3}^{-}$ radical. $FeS{{O}_{4}}+NO\xrightarrow{{}}\underset{brown\,ring}{\mathop{FeS{{O}_{4}}NO}}\,$
$(6FeS{{O}_{4}}+2HN{{O}_{3}}+2{{H}_{2}}S{{O}_{4}}\xrightarrow{{}}$ $3F{{e}_{2}}{{(S{{O}_{4}})}_{3}}+4{{H}_{2}}O+2NO\uparrow )$