Ammonium hydroxide solution can be used to distinguish between zinc ion and calcium ion.

True

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False

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Solution

The correct option is A
True

When ammonium hydroxide is added to a salt solution of zinc, such as zinc nitrate solution, a white precipitate is formed. The white precipitate dissolves when excess ammonium hydroxide is added.

$Z n (N O_{3})_{2} + N H_{4} O H \to Z n (O H)_{2} (p p t) + N H_{4} N O_{3}$

$Z n (O H)_{2} + N H_{4} O H (e x c e s s) \to [Z n (N H_{3})_{4}] S O_{4} + H_{2} O$

But when ammonium hydroxide is added to a salt solution of the calcium, such as calcium nitrate solution, there is no visible reaction.

$C a (N O_{3})_{2} + N H_{4} O H \to N o p r e c i p i t a t e o f C a (O H)_{2} i s f o r m e d$

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