Question
Give reason:
Ammonium compounds do not occur as minerals.

Answer

Ammonium compounds being highly soluble in water do not occur as minerals.

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$\begin{array}{cc}
\phantom{}\ce{H}\phantom{..}\phantom{}\ce{H}\phantom{..}\phantom{}\ce{H}\phantom{..}\phantom{}\ce{H}\phantom{..}\phantom{}\ce{H}\phantom{}\\
\phantom{...}|\phantom{...}\phantom{}|\phantom{...}\phantom{.}|\phantom{...}\phantom{}|\phantom{...}\phantom{}|\phantom{...}\\
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\phantom{...}|\phantom{...}\phantom{}|\phantom{...}\phantom{.}|\phantom{...}\phantom{}|\phantom{...}\phantom{}|\phantom{...}\\
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\phantom{...}|\phantom{...}\phantom{}|\phantom{...}\phantom{.}|\phantom{...}\phantom{}|\phantom{...}\phantom{}|\phantom{...}\\
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_______________
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