Select the correct word from the list in bracket to complete each statement.

1. The oxidised product obtained on reaction of H₂S gas with dil. HNO₃ is ……………. [sulphur dioxide / sulphur / sulphuric acid].
2. Aqua regia is a mixture of one part of …………… and three parts of …………… [conc. hydrochloric acid / conc. nitric acid] in which nitric acid …………… [reduces/oxidises] hydrochloric acid to chlorine.
3. Pure conc. nitric acid or fuming nitric acid renders the metal …………… [zinc/copper/iron] passive or inactive.
4. A mineral acid obtained from conc. nitric acid on reaction with a non-metal is …………… [hydrochloric acid / sulphuric acid / carbonic acid].
5. The reaction of …………… [calcium carbonate / calcium oxide / calcium sulphite] with dilute nitric acid is an example of a neutralization reaction.

Give balanced equations for the following conversions A to E.

1. $\text{Copper} \xrightarrow{\text{A}} \text{Copper nitrate} \xrightarrow{\text{B}} \text{Copper oxide} \xrightarrow{\text{C}} \text{Copper}$

2. $\text{Sulphur} \xrightarrow{\text{D}} \text{Sulphuric acid} \xleftarrow{\text{E}} \text{Sulphur dioxide}$

Give reasons for the following:

Nitric acid is not manufactured from atmospheric nitrogen.

Give reasons for the following:

Nitric acid affects the skin if it accidently falls on it, staining the skin yellow.