State your observation for the following reactions.

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State your observation for the following reactions.

Chemistry | Class 10 | ICSE | Selina | Study of Compounds – Hydrogen Chloride

State your observation for the following reactions.

1. Dilute HCl is added to sodium carbonate crystals.

2. Copper sulphide is treated with dilute hydrochloric acid.

3. A few drops of dil. HCl is added to silver nitrate solution, followed by addition of NH₄OH solution.

1. When sodium carbonate crystals are added to dil HCl, sodium chloride, water and carbon dioxide form. Brisk effervescence occurs and this is called the neutralization reaction.

Reaction Involved:

Na₂CO₃ + 2 HCL → 2 NaCl + H₂O + CO₂

2. When copper sulphide is treated with dilute hydrochloric acid, black sulphite turns blue by producing hydrogen sulphide gas with a rotten egg odor.

Reaction Involved:

CuS + HCl → CuCl₂ + H₂S

3. When a few drops of dilute hydrochloric acid was added to the silver nitrate solution, followed by the addition of NH₄OH solution, it forms a curdy white precipitate of silver chloride that is soluble in ammonium hydroxide.

Reaction Involved:

AgNO₃ + HCl → AgCl + HNO₃

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