Question

The volume of water to be added to $100c{m}^3$ of $0.5N{H}_{2}S{O}_4$ to get decinormal concentration is:

• A. $100c{m}^3$
• B. $450c{m}^3$
• C. $500c{m}^3$
• D. $400c{m}^3$

Answer 1

The correct option is D $400c{m}^3$

$\because N_1{V}_1=N_2{V}_2$

Given,

$N_1=0.5N,$

$N_2=0.1N,$

$V_1=100c{m}^3,$

$V_2=?$

$\therefore 0.5\times 100=0.1\times V_2$

$V_2=500c{m}^3$ (Total final volume)

$\therefore$ Volume to be added

$=500-100=400c{m}^3$.

Hence, the correct option is $D$