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Answer 1

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Question : What happens when Silver article is kept in open for few days ?

✍️ Silver article turns black because silver article reacts with sulphur compounds such as hydrogen sulphide (H2S) present in air.

Question: what happens when copper nitrate undergoes heating ?

✍️Copper nitrate is a bright blue crystalline solid containing three molecules of water. When it is heated first it loses the water molecule, on further heating it decomposes to give reddish brown gas, nitrogen dioxide and oxygen

Question: Iron sulphate reacts with Zinc metal ?

✍️When zinc is added to the solution of iron sulphate, the colour of iron sulphate solution changes. It is because zinc is more reactive than iron, therefore, it displaces iron from its solution of iron sulphate and a grey precipitate of iron and a colourless solution of zinc sulphate is formed

Question:Aluminium metal is added to dilute H2SO4

✍️Aluminum reacts with hydrochloric acid to produce aluminum chloride and hydrogen gas. Aluminum reacts with hydrochloric acid to produce aluminum chloride and hydrogen gas.

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Answer 2

Answer:

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