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Q.

Number of equivalents of HCI present in 100 mL of its solution whose pH is 4 :

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a

10 ^-4

b

10 ^-3

c

10 ^-2

d

10^-5

answer is D.

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Detailed Solution

pH= 4, $[H^{+}] = 10^{- 4} mol / litre$

Equivalent of HCl in 100 mL solution

$= \frac{10^{- 4} \times 100}{1000} = 10^{- 5}$

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Number of equivalents of HCI present in 100 mL of its solution whose pH is 4 :