JEE Main 2022 · 29 Jul · Shift 2 · Chemistry Q64 · Dronacharya Exams

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ChemistrySingle correct+4 / -1Question 64 of 90

200 mL of 0.01 M HCl is mixed with 400 mL of 0.01 M H $_2$ SO $_4$ . The pH of the mixture is _______.

Given: log 2 = 0.30, log 3 = 0.48, log 5 = 0.70, log 7 = 0.84, log 11 = 1.04

A

1.14

B

1.78

C

2.34

D

3.02

Answer and worked solution

Official answer: B

H⁺ $\dfrac{200\times0.01+400\times0.02}{600}=\dfrac1{60}$ M, so pH $=\log60=1.78$ .

(B)

Topics:pH and ionisation

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