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Q.

The correct order of increasing [H3O+] in the aqueous solution is

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a

0.01 M H2S < 0.01 M H2SO4 < 0.01 M NaCl < 0.01 M NaNO2

b

0.01 M NaCl < 0.01 M NaNO2 < 0.01 M H2S < 0.01 M H2SO4

c

0.01 M NaNO2 < 0.01 M NaCl < 0.01 M H2S < 0.01 M H2SO4

d

0.01 M H2S < 0.01 M NaNO2 < 0.01 M NaCl < 0.01 M H2SO4

answer is C.

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Detailed Solution

H2SO4 is a strong acid and H2S is a weak dibasic acid.H2S is a weak acid, its pH is less than 7 but greater than that of H2SO4.NaCl is a neutral salt of strong acid and strong base. Such a salt solution has a PH = 7NaNO2 is a salt of strong base (NaOH) and weak acid (HNO2). Such a salt solution has a pH > 7PH=12PKw+PKa+logC
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