Which of the following statements is correct?

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(C) $1$. $LiHCO_3$ does not exist in solid state; it is only known in solution form.$2$. Potassium superoxide $(KO_2)$ contains the paramagnetic super

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$Be(OH)_2$ is insoluble in water but soluble in $NaOH$

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(C) $1$. $LiHCO_3$ does not exist in solid state; it is only known in solution form.$2$. Potassium superoxide $(KO_2)$ contains the paramagnetic superoxide ion $(O_2^-)$,which has one unpaired electron,so it is paramagnetic,not diamagnetic.$3$. $Be(OH)_2$ is amphoteric in nature. It is insoluble in water but reacts with strong bases like $NaOH$ to form beryllates,e.g.,$Na_2[Be(OH)_4]$,making it soluble.$4$. $Li_2CO_3$ is less thermally stable than $Na_2CO_3$ because the small $Li^+$ ion polarizes the carbonate ion more effectively,leading to easier decomposition into $Li_2O$ and $CO_2$.

List-$I$	List-$II$
$(a)$ $Li$	$(i)$ photoelectric cell
$(b)$ $Na$	$(ii)$ absorbent of $CO_{2}$
$(c)$ $K$	$(iii)$ coolant in fast breeder nuclear reactor
$(d)$ $Cs$	$(iv)$ treatment of cancer
	$(v)$ bearings for motor engines

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