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Reaction with Metal Salts

On adding dil...

Question

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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Solution

(a) $Z n C l_{2}$
(b) $Z n (O H)_{2}$

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Q. 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?

Q. A solution when diluted with water and boiled, gives a white precipitate. On addition of an excess of

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