MCQ
Ammonium hydroxide is a weak base because
- AIt has low vapour pressure
- ✓It is only slightly ionized
- CIt is not a hydroxide of any metal
- DIt has low density
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(Relative atomic masses of $Ag$ and $Br$ are $108\, u$ and $80\, u$, respectively).
Assertion $(A)$ $:$ When Cu $(II)$ and sulphide ions are mixed, they react together extremely quickly to give a solid.
Reason $(R)$ $:$ The equilibrium constant of $Cu ^{2+}( aq )+ S ^{2-}( aq ) \rightleftharpoons \operatorname{CuS}( s )$ is high because the solubility product is low.