MCQ
Which of the following is an electrovalent linkage
- A$C{H_4}$
- ✓$Mg{Cl_2}$
- C$SiC{l_4}$
- D$B{F_3}$
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$(a)$ The vapour pressure of water at $280 K$ is $14.2$ $mm Hg$
$(b)$ $R =0.082 L$ atm $K ^{-1} mol ^{-1}$