Q27 / 180 · COMEDK 2013 · Chemistry

The equivalent weight of a certain trivalent element is $20$. Molecular weight of its oxide is

A
$152$
B
$56$
Correct answer
C
$168$
D
$68$

Solution

Equivalent weight $=\frac{\text { molecular weight }}{\text { valence factor }}$ $\therefore$ Molecular weight $=20 \times 3=60$ It's oxide is $\mathrm{M}_{2} \mathrm{O}_{3}$ and molecular weight $$ =2 \times 60+16 \times 3=120+48=168 $$

Hence, the correct answer is option: 'C'.

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