On adding dilute ammonia solution to a colourless sulphate solution of sulphate salt, a white gelatinous ppt, appears. This ppt. however dissolves on addition of excess of ammonia solution. Identify (choose from $Na, Al, Zn, Pb, Fe$ ):
(i) Which metal salt solution was used?
(ii) What is the formula of the white gelatinous ppt. formed?
(iii) Why did the white ppt dissolve in excess of ${NH}_{4} OH$ ?

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Solution

(i) Zinc sulphate, ${ZnSO}_{4}$
(ii) Zinc hydroxide, $Zn (OH)_{2}$
(iii) The white precipitate dissolves in excess ammonium hydroxide because of the formation of soluble tetraamine zinc (II) sulphate, $[Zn {({NH}_{3})}_{4}] {SO}_{4}$ .

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