Question

$2g$ of metal carbonate is neutralised completely by $100ml$ of $0.1N$ $HCl$. The equivalent weight of metal carbonate is :

• A. $50$
• B. $100$
• C. $150$
• D. $200$

Answer 1

The correct option is D $200$

As $2g$ of metal carbonate is neutralised by $100ml$ of $0.1NHCl$.
$\because$ Number of gram-equivalents of $HCl$
$=\frac{100\times 0.1}{1000}=0.01$
$\therefore$ Number of gram-equivalents of metal carbonate $=0.01$
Mass of $0.01$ gram equivalent metal carbonate $=2g$
Mass of 1 gram equivalent metal carbonate$=\frac{2}{0.01}=200g$
$\therefore$ Equivalent mass of metal carbonate $=200$