On adding dilute ammonia solution to a colourless solution of a salt, a white gelatinous precipitate appears. This precipitate however dissolves on addition of excess of ammonia solution. Identify (Choose from Na, Al, Zn, Pb, Fe)
(a) which metal salt solution was used?
(b) what is the formula of the white gelatinous precipitate obtained?

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Solution

(a) Zinc salt solution was used.
(b) The formula of white gelatinous precipitate obtained is Zn(OH)₂, zinc hydroxide.

On adding ammonia solution in drops, zinc salts such as zinc sulphate forms a white gelatinous precipitate of zinc hydroxide. On further adding excess of ammonium hydroxide, the formed precipitate of zinc hydroxide dissolves to form complex, colourless tetramine zinc(II) sulphate.

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On adding dilute ammonia solution to a colourless solution of a salt, a white gelatinous precipitate appears. This precipitate, however, dissolves on the addition of an excess of ammonia solution. Identity (choose from Na, Al, Zn, Pb, Fe)
(a) Which metal salt solution was used?
(b) What is the formula of the white gelatinous precipitate obtained?

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