Sulphur reacts with conc. HNO₃ to give :

1. SO₂
2. H₂
3. H₂SO₄
4. H₂S

The solvent for NO is :

1. Freshly prepared FeSO₄
2. Fe₂(SO₄)₃
3. FeCl₃
4. FeCl₂

HNO₃ is kept in reagent bottles because it is :

1. an oxidising agent
2. a reducing agent
3. hygroscopic in nature
4. decompose in the presence of light

The nitrate which does not leave any residue behind on heating is :

1. NaNO₃
2. NH₄NO₃
3. AgNO₃
4. Ca(NO₃)₂