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Question

Identify the cations in each of the following cases :
(i) NaOH solution when added to the Solution (A) gives a reddish brown precipitate.
(ii) NH4OH Solution when added to the Solution (B) gives white precipitate which does not dissolve in excess.
(iii) NaOH Solution when added to Solution (C) gives white precipitate which is insoluble in excess.

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Solution

(i) Fe3+ with NaOH gives reddish brown precipitate of Fe(OH)3.
(ii) Pb+2 with NH4OH gives gelatinous white precipitate of Pb(OH)2.
(iii) Ca+2 with NaOH gives white precipitate of Ca(OH)2 which dissolves in excess.

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