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The \( \mathrm{pH} 0.1 \mathrm{M} \) solution of the following salts
P increases in the order:

W
(1) \( \mathrm{NaCl}\mathrm{NH}_{4} \mathrm{Cl}\mathrm{NaCN}\mathrm{HCl} \)
(2) \( \mathrm{HCl}\mathrm{NH}_{4} \mathrm{Cl}\mathrm{NaCl}\mathrm{NaCN} \)
(3) \( \mathrm{NaCN}\mathrm{NH}_{4} \mathrm{Cl}\mathrm{NaCl}\mathrm{HCl} \)
(4) \( \mathrm{HCl}\mathrm{NaCl}\mathrm{NaCN}\mathrm{NH}_{4} \mathrm{Cl} \)
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