Lead nitrate decomposes on heating to give:

1. NO
2. N₂O
3. NO₂
4. N₂O₅

In the laboratory preparation of nitric acid, nitre is heated with :

1. conc. HCl
2. conc. H₂SO₄
3. dil. H₂SO₄
4. conc. H₃PO₄

The catalyst used in the manufacture of HNO₃ is :

1. Pt
2. V₂O₅
3. Fe
4. Pd

Cold and dilute HNO₃ reacts with Cu to give :

1. NO₂
2. NO
3. N₂
4. O₂