When ammonium hydroxide is added to a solution B, a pale blue precipitate is formed. The pale blue precipitate dissolves in excess of ammonium hydroxide to give an inky blue solution. What is the cation (positive ion) present in solution B? What is the probable colour of solution B?

The cation is Cu^ 2+ ion. Solution B is copper sulphate. It is bright blue in colour.

When ammonium hydroxide is added to a solution B, a pale blue pre…

Explain the following :
On electrolysis of dilute copper (II) sulphate solution, copper is deposited at the cathode but hydrogen gas evolves there.

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What ions must be present in a solution used for electroplating a particular metal?

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Name the Following:
Two coloured nitrates.

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Ammonia cannot be collected over water. Give reasons.

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Write a balanced equation for following :
Action of conc. Nitric acid on sulphur

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Explain, why solid sodium chloride does not allow electricity to pass through?

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Name the following:
The kind of welding in which aluminium powder is used.

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Sulphur dioxide gas.

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Name: two metalloids

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The element with maximum non-metallic character from the element of period 2.

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