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Q. $100\, mL$ of $1 \,M \,HCl$ solution is diluted to $500\, mL$. The final molarity of $HCl$ solution is

Solution:

$M_{1}V_{1}=M_{2}V_{2}$
$100 \times 1=M_{2}\times500$
$M_{2}=0.2\,M$