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JEE Main levelSingle correct optionDifficulty 2 of 3mc138

200 mL of 0.5 M HCl is mixed with 300 mL of 0.2 M HCl (volumes additive). The molarity of the mixture is

A $0.32 M$
B $0.35 M$
C $0.70 M$
D $0.38 M$

Answer: A

Moles = 0.200 x 0.5 + 0.300 x 0.2 = 0.100 + 0.060 = 0.160 mol in 0.500 L. Molarity = 0.32 M. The simple mean 0.35 ignores the different volumes.

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