4(i)
Select the compound / element from the box given below for each of the following statements:
| H2 | NO2 | NO | O2 |
|---|
(a) The colourless gas obtained when a metallic nitrate undergoes thermal decomposition.
(b) The gas which on oxidation produces a coloured gas.
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(a) O2 — Oxygen is a colourless gas evolved during the thermal decomposition of metallic nitrates.
(b) NO — Nitric oxide (colourless) on oxidation gives the reddish-brown gas nitrogen dioxide.
2NO + O2 ⟶ 2NO2