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Q.

Which of the following solution will have pH close to 1.0?

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a

75 mL of M/5 HCl+25 mL of M/5 NaOH

b

100 mL of M/10 HCl+100 mL of M/10 NaOH

c

55 mL of M/10 HCl +45 mL of M/10 NaOH

d

10 mL of M/10 HCl+90 mL of M/10 NaOH

answer is D.

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Detailed Solution

Option D has solution, which will have pH close to 1.0.

For, 75 mL of M/5 HCl+25 mL of M/5 NaOH,

 H+=75×15−25×15100;   H+=0.1

Thus,

pH=1

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