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ICSE Class 10 Chemistry Question 10 of 24

Solved 2023 Question Paper ICSE Class 10 Chemistry — Question 1

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Question

Question 3(i)

Identify the cation in each of the following cases:

(a) Ammonium hydroxide solution when added to Solution B gives a white precipitate which does not dissolve in excess of ammonium hydroxide solution.

(b) Sodium hydroxide solution when added to Solution C gives a white precipitate which is insoluble in excess of sodium hydroxide solution.

Answer

(a) Pb2+

Reason — When ammonium hydroxide solution is added to lead nitrate, it forms a chalky white precipitate of lead hydroxide [Pb(OH)2] which is insoluble in excess of ammonium hydroxide.

Pb(NO3)2 + 2NH4OH ⟶ 2NH4NO3 + Pb(OH)2

(b) Ca2+

Reason — When sodium hydroxide solution is added to calcium nitrate, a white precipitate of calcium hydroxide is obtained which is insoluble in excess of sodium hydroxide solution.

Ca(NO3)2 + 2NaOH ⟶ Ca(OH)2 ↓ + 2NaNO3