Flash Education

Question

State one appropriate observation for :
(i) Copper sulphide is treated with dilute hydrochloric acid.
(ii) A few drops of dil. HCl are added to AgNO3 soln. followed by addition of NH4OH soln.

Hydrogen Chloride

Chemistry, Class 10, ICSE, J Dalal

August 22, 2024

Answer

(i) A colourless gas having smell of rotten eggs is given off. The gas evolved is H₂S

CuS + 2HCl ⟶ CuCl₂ + H₂S

(ii) Curdy white precipitate of silver chloride [AgCl] is obtained, which is soluble in excess of NH₄OH.

AgNO₃ + HCl ⟶ AgCl ↓ + HNO₃

AgCl + 2NH₄OH ⟶ [Ag(NH₃)₂Cl)] + 2H₂O

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💡 Some Related Questions

Identify the gas evolved and give the chemical test when dilute hydrochloric acid reacts with :
(i) Sodium sulphite.
(ii) Iron [II] sulphide.

State your observations when dilute hydrochloric acid is added to :
(i) Lead nitrate soln. and the mixture is heated.
(ii) Copper carbonate.
(iii) Sodium thiosulphate.

Write balanced chemical equation for : Action of hydrochloric acid on sodium bicarbonate.

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(iii) State a safety precaution taken during the preparation of hydrochloric acid.

Identify the acid which on mixing with AgNO3 soln. gives a white precipitate, soluble in excess ammonium hydroxide.

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