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Zinc Ion

Which of the ...

Question

Which of the following does not dissolve in excess of $N a O H$ solution?

A

A l (O H)_{3}

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B

Z n (O H)_{2}

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C

P b (O H)_{2}

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D

F e (O H)_{3}

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Solution

The correct option is D $F e (O H)_{3}$
Aluminium hydroxide, zinc hydroxide and lead hydroxide dissolve in excess sodium hydroxide solution to form soluble compounds. However, ferric hydroxide is not soluble in excess sodium hydroxide solution.
The reactions in $N a O H$ are as follows:
$A l (O H)_{3} + N a O H \to N a A l O_{2} sodium meta aluminate + 2 H_{2} O$
$Z n (O H)_{2} + 2 N a O H \to N a_{2} Z n O_{2} sodium zincate + 2 H_{2} O$
$P b (O H)_{2} + 2 N a O H \to N a_{2} P b O_{2} sodium plumbite + 2 H_{2} O$

$F e (O H)_{3} + N a O H \to no reaction$

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Similar questions

Q. Which one of the following metallic hydroxides does not dissolve in sodium hydroxide solution?

Z n (O H)_{2}

F e (O H)_{3}

Q. Find the odd one with reasons [valency is not a criterion]:

A l (O H)_{3}, P b (O H)_{2}, M g (O H)_{2}, Z n (O H)_{2}

Z n S O_{4}

P b (N O_{3})_{2}

have similar powdery white appearance. So, which of the given options help us to identify

Z n^{2 +}

P b^{2 +}

when both are treated with

N a O H

N H_{4} O H

?

Z n {(O H)}_{2}

is dissolved in both

{N H}_{4} O H

N a O H

solution. Reason: Both

N a O H

{N H}_{4} O H

being basic can dissolve amphoteric

Z n {(O H)}_{2}

.

Q. Identify the inorganic salt

A

whose aqueous solution gives following reactions.
(i) pale yellow precipitate with

A g N O_{3}

solution, insoluble in dil

H N O_{3}

(ii) white precipitate with

N H_{4} O H

N a O H

solution. However the precipitate does not dissolve in excess of

N H_{4} O H

but soluble in excess of

N a O H

.

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