MCQ
Which of the following group elements show variable valency?
- AAlkali metals
- BNoble gases
- ✓Transition metals
- DAlkaline earth metals
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(Given : Molar Mass $\mathrm{Na}: 23$ and $\mathrm{Cl}: 35.5 \mathrm{gmol}^{-1}$ )
(Molar Mass : Bromine $=80\; g / mol$ )