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State your observations when: 

1. Dilute Hydrochloric acid is added to Lead nitrate solution and the mixture is heated. 

2. Barium chloride solution is mixed with Sodium Sulphate Solution. 

3. Concentrated Sulphuric acid is added to Sugar Crystals. 

4. Dilute Hydrochloric acid is added to Copper carbonate. 

5. Dilute Hydrochloric acid is added to Sodium thiosulphate.

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1. A white precipitate of lead chloride appears which dissolves on heating. 

2. A white insoluble precipitate of Barium sulphate is obtained. 

3. White crystals of sugar turn to a black spongy mass called sugar charcoal.

4. A brisk effervescence with the release of colourless, odourless, acidic gas that extinguish glowing splint i.e., carbon dioxide gas is evolved.

5. A colourless gas with smell of burning sulphur i.e., Sulphur dioxide is released. A yellow crystal settles at the bottom i.e., sulphur.

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