MCQ
When a sulphur atom becomes a sulphide ion
- AThere is no change in the composition of atom
- ✓It gains two electrons
- CThe mass number changes
- DNone of these
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[Assume steam to be an ideal gas. Given $A _{ vap } H ^{\ominus}$ for water at $373 \,K$ and $1\, bar$ is $41.1 \,kJ\, mol ^{-1} ; R =$ 8.31 $J\,K ^{-1} \,mol ^{-1}$ ]
