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