The chemical used in the brown ring test is:

1. CuSO₄
2. FeSO₄
3. Fe₂(SO₄)₃
4. ZnSO₄

Lead nitrate decomposes on heating to give:

1. NO
2. N₂O
3. NO₂
4. N₂O₅

Nitric acid is manufactured by :

1. Bayer's process
2. Haber's process
3. Ostwald process
4. Contact process

The catalyst used in the manufacture of HNO₃ is :

1. Pt
2. V₂O₅
3. Fe
4. Pd