MCQ
Which forms a crystal of $NaCl$
- A$NaCl$ molecules
- ✓$N{a^ + }$ and $C{l^ - }$ions
- C$Na$ and $Cl$ atoms
- DNone of the above
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[Given : Molal depression constant and density of water are $1.86\, K\, kg\, mol^{-1}$ and $1\, g\, cm^{-3}$ respectively.]
$NH _{2} CN _{( s )}+\frac{3}{2} O _{2}( g ) \rightarrow N _{2( g )}+ O _{2}( g )+ H _{2} O _{(l)}$
is ............ $kJ$. (Rounded off to the nearest integer)
[Assume ideal gases and $\left. R =8.314\, J\, mol ^{-1} K ^{-1}\right]$
