Question

Match the following columns

Column 1	Column 2
Nitroso ferrous sulfate	Reddish brown
Nitric oxide	Brown black
Conc. nitric acid comes in contact with skin.	Brown
$N{O}_2$gas passed through acidified freshly prepared ferrous sulfate.	Yellow

Answer 1

(i) Nitroso ferrous sulfate matches with (c) Brown

Explanation:

In the brown ring test, the brown color of the ring is due to Nitroso ferrous sulfate$(FeS{O}_4.NO)$.

(ii) Nitric oxide $\left(NO\right)$ matches with (a) Reddish-brown

Explanation:

Nitric oxide is a colorless, flammable gas. Nitrogen dioxide is a deep red-orange gas. It, along with aerosols, is responsible for the reddish-brown color of smog.

(iii) Conc. nitric acid matches with (d) Yellow

Explanation:

The skin contains proteins and proteins contain aromatic amino acids. When the skin comes in contact with concentrated nitric acid then the proteins are converted into Xantho proteins. The Xantho proteins are yellow in color. And thus, the skin becomes yellow.

(iv) $N{O}_2$ gas passed through acidified freshly prepared ferrous sulfate matches with (b) Brown black

Explanation:
When $N{O}_2$ gas passed through acidified freshly prepared ferrous sulfate. Nitrate ions give a reddish-brown colored gas of Nitrogen dioxide which turns freshly prepared acidified ferrous sulfate solution brown-black.