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Explain the following: (a)pH of 10^(-7...

Explain the following:
(a)pH of `10^(-7)` M HCl is not 7.
(b)Degree of hydrolysis of an aqueous solution of a salt of weak acid and weak base is independent of initial concentration of the salt.
(c) The aqueous solution of `NH_4Cl` is acidic.
(d)A mixture of sodium acetate and acetic acid resis changes in pH value on adding acid or base .

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