Chemistry
State one relevant observation for each of the following.
(a) Dilute hydrochloric acid is added to sodium thiosulphate.
(b) Mixture of ammonium chloride and sodium hydroxide is heated.
(c) Burning of ammonia in air.
Ammonia
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Answer
(a) Yellow particles of Sulphur precipitate.
Na2S2O3 + 2HCl ⟶ 2NaCl + SO2 + S + H2O
(b) Pungent smelling ammonia gas is evolved.
NH4Cl + NaOH ⟶ NaCl + H2O + NH3 ↑
(c) Ammonia burns in the atmosphere of excess oxygen with a green or greenish yellow flame, forming nitrogen and water.
4NH3 + 3O2 ⟶ 2N2 + 6H2O
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