The concentration of a $100 \mathrm{~mL}$ solution containing $X \mathrm{~g}$ of $\mathrm{Na}_2…
The concentration of a $100 \mathrm{~mL}$ solution containing $X \mathrm{~g}$ of $\mathrm{Na}_2 \mathrm{CO}_3$ (molecular wt. $=106$ ) is $Y M$. The values of $X$ and $Y$ are respectively.
$2.12,0.05$
$1.06,0.2$
$1.06,0.1$
$2.12,0.1$
Solution
$W=\frac{M m V}{1000}$
$
\begin{aligned}
M & =\frac{W \times 1000}{m \times V} \\
Y & =\frac{X \times 1000}{106 \times 100} \\
\therefore \quad 106 Y & =10 X
\end{aligned}
$
Among the given options, only the values in option (c) can satisfy the equation (i), hence the correct answer is (c)