Identify the correct statement from the following
I. LiF is less soluble in water than NaF
II. Both LiCl and $\mathrm{MgCl}_2$ are insoluble in ethanol
III. Both Li and Mg form nitrides
IV. $\mathrm{Na}_2 \mathrm{CO}_3$ gives $\mathrm{CO}_2$ on heating
The major ingredient $(51 \%)$ in Portland cement is
Boron trifluoride on reaction with lithium aluminium hydride in ether gives $\mathrm{LiF}^{\circ} \mathrm{AlF}_3$ and $X . X$ on reaction with $\mathrm{NH}_3$ gives $Y$. $Y$ on further heating gives a compound $Z$. The number of $\sigma$-bonds and $\pi$-bonds in $Z$ are $x$ and $y$ respectively. $(x+y)$ is equal to
Consider the following sequence of reaction
$$ 2 \mathrm{CH}_3 \mathrm{Cl}+\mathrm{Si} \xrightarrow[573 \mathrm{~K}]{\mathrm{Cu}} X \xrightarrow{\mathrm{H}_2 \mathrm{O}} Y \xrightarrow{\text { Polymerisation }} Z $$
The repeating structural unit in Z is
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