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Question

A beaker contains 0.1 M H2SO4 solution; of 100 ml. Another 100 ml of it is added to the beaker.

(I) What is the initial number of moles of H+ ions?

​(II) What is the final number of moles of H+ ions?


A

20, 40

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B

30, 20

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C

20, 30

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D

30, 40

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Solution

The correct option is C

20, 30


Firstly, Let's consider the situation before HCl is added.
We have 0.1 M H2SO4 of 100 ml.
We know, No. of moles = Molarity × volume
(H2SO4)

No. of moles of H+=2×0.1×100=20
After adding HCl, there in an increase in H+ ions.
Similarly, No. of moles of H+ in HCl = 100 × 0.1 = 10

Final number = 20 + 10 = 30


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