The molarity of a solution obtained by mixing 750 mL of 0.5M HCl with 250 mL of 2M HCl will be :

1.75 M

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0.975 M

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0.875 M

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1.00 M

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Solution

The correct option is C 0.875 M
$M_{1} V_{1} + M_{2} V_{2} = M_{R} (V_{1} + V_{2})$
$0.5 \times 750 + 2 \times 250 = M_{R} (750 + 250)$
$M_{R} = 0.875$

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