Choose the letters L, M, N, O & P to match the description (a) to (c) given below:
[L – Ammonia, M – Nitrogen, N – Hydrogen sulphide, O – Hydrogen chloride gas, P – Nitrogen dioxide]
(a) When this gas comes in contact with ammonia dense white fumes are seen.
(b) The gas that turns moist lead acetate paper silvery black.
(c) The gas produced on heating lead nitrate.
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(a) O — Hydrogen chloride gas
Reason — When HCl is brought near ammonia gas, dense white fumes of ammonium chloride are formed.
HCl + NH3 ⟶ NH4Cl
(b) N — Hydrogen sulphide
Reason — Hydrogen sulphide(H2S) gas turns the moist lead acetate paper black
(CH3COO)2Pb + H2S ⟶ PbS + CH3COOH
(c) P — Nitrogen dioxide
Reason — When lead nitrate is heated nitrogen dioxide gas is evolved.
2Pb(NO3)2 $\xrightarrow{\Delta}$ 2PbO + O2 + 4NO2