MCQ
When $S{n^{2 + }}$changes to $S{n^{4 + }}$in a reaction
- ✓It loses two electrons
- BIt gains two electrons
- CIt loses two protons
- DIt gains two protons
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| Element | Atomic mass |
| $A$ | $12.01$ |
| $B$ | $35.5$ |
$A$ and $B$ combine to form new substance $X$ . If $4\,moles$ of $B$ combine with $1\,mole$ of $A$ to give $1\,mole$ of $X,$ then weight of one mole of $X$ is ........... $\mathrm{g}$