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ICSE Class 10 Chemistry Question 12 of 23

Solved Sample Paper 4 — Question 10

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10
Question

Question 5(ii)

Distinguish between the following as directed.

(a) Ammonium chloride and sodium chloride on the basis of heating

(b) Ferric salt and ferrous salt by using ammonium hydroxide

Answer

(a) On strong heating, ammonium chloride sublimes to form dense white fumes which condense to white powdery substance on cooler parts of the test tube whereas no white fumes are seen on heating sodium chloride. Hence, the two can be distinguished.
NH4Cl →Δ\xrightarrow{\Delta} NH3 + HCl

(b) On reaction with ammonium hydroxide, ferrous salt forms a dirty green ppt whereas ferric salt forms a reddish brown ppt. Hence, the two can be distinguished easily.