4. Chemical bonding and molecular structure — Chemistry STD 11 Science — Question

( electron charge $= 1.60\times10^{-19}\, C$)

$(i)\, [Xe]\,6s^1$
$(ii)\, [Xe]\,4f^{14}5d^16s^2$
$(iii)\, [Ne]\,3s^23p^5$
$(iv)\, [Ar]\,3d^74s^2$

Which one of the following statements about these elements is not true ?

$A$. A liquid evaporates to vapour.

$B$. Temperature of a crystalline solid lowered from $130 \mathrm{~K}$ to $0 \mathrm{~K}$.

$C$. $2 \mathrm{NaHCO}_{3(\mathrm{~s})} \rightarrow \mathrm{Na}_2 \mathrm{CO}_{3(\mathrm{~s})}+\mathrm{CO}_{2(\mathrm{~g})}+\mathrm{H}_2 \mathrm{O}_{(\mathrm{g})}$

$D$. $\mathrm{Cl}_{2(g)} \rightarrow 2 \mathrm{Cl}_{(g)}$

Choose the correct answer from the options given below: