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ICSE Class 10 Chemistry Question 56 of 62

Study of Compounds — Sulphuric Acid — Question 58

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Question

Question 2(2019)

Distinguish between the following pairs of compounds using the reagent given in the bracket:

Dilute hydrochloric acid and dilute sulphuric acid [using lead nitrate soln.]

Answer

Sulphuric acid forms a white precipitate with lead nitrate solution. This precipitate does not dissolve on warming the reaction mixture.

H2SO4 (dil.) + Pb(NO3)2 ⟶ 2HNO3 + PbSO4 ↓ [white ppt. formed which does not dissolve on warming the mixture].

Hydrochloric acid forms a white precipitate with lead nitrate solution. This precipitate dissolves on warming the reaction mixture so as to form clear solution.

2HCl (dil.) + Pb(NO3)2 ⟶ 2HNO3 + PbCl2 ↓ [white ppt. formed which dissolves on warming the mixture].

Hence, dilute hydrochloric acid and dilute sulphuric acid can be distinguished using lead nitrate solution.