MCQ
$pH$ of a solution is $9.5. $ The solution is
- ANeutral
- BAcidic
- ✓Basic
- DAmphoteric
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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.