You are provided with some compounds in the box.
| PbO | CH4 | PbO2 | CO2 | |||
| HCl | NCl3 | SO2 |
Choose the most appropriate compound which fits the descriptions (a) to (c) given below:
(a) A colourless gas which turns acidified K2Cr2O7 from orange to green.
(b) A yellow explosive oily liquid formed when excess chlorine gas reacts with ammonia gas.
(c) A yellow metallic oxide formed on thermal decomposition of PbCO3.
Show SolutionHide Solution↓
(a) SO2
Reason — Sulphur dioxide is a colourless gas. It is a reducing agent and turns acidified potassium dichromate solution from orange to green.
(b) NCl3
Reason — Nitrogen trichloride is a yellow explosive oily liquid formed when excess chlorine reacts with ammonia.
NH3 + 3Cl2 ⟶ NCl3 + 3HCl
(c) PbO
Reason — Lead(II) oxide is yellow and is produced when lead carbonate (PbCO3) undergoes thermal decomposition.
PbCO3 ⟶ PbO + CO2