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  4. A white powder soluble in NH 4 OH but insoluble in water is

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Q. A white powder soluble in $NH _{4} OH$ but insoluble in water is

The d-and f-Block Elements

Solution:

$AgCl$ is a covalent compound hence it is insoluble in water also it form complex with $NH _{4} OH$, thus is soluble in $NH _{4} OH$
$AgCl +2 NH _{4} OH \to \left[ Ag \left( NH _{3}\right)_{2}\right] Cl + H _{2} O$