MCQ
Alumina is insoluble in water because
- AIt is a covalent compound
- ✓It has high lattice energy and low heat of hydration
- CIt has low lattice energy and high heat of hydration
- D$Al^{3+}$ and $O^{2-}$ ions are not excessively hydrated
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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.

$CaCO _{3( s )}+2 HCl _{( aq )} \rightarrow CaCl _{2( aq )}+ CO _{2( g )}+2 H _{2} O _{( l )}$
[Calculate upto second place of decimal point]