Among the species A : ( $C r C l_{3}$ ); B : ( $C u S$ ); C : ( $A l C l_{3}$ ); D : ( $Z n C l_{2}$ ); which will be soluble in excess of $N a O H$ ?

A, C, and D

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C and D only

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B and C only

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A and D only

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Solution

The correct option is A A, C, and D
$C r C l_{3}, A l C l_{3}$ and $Z n C l_{2}$ are soluble in excess of $N a O H$ . The presence of these cations can be determined on treating with excess of $N a O H$ .

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