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An aqueous solution has [H^+ ] ion concentration = 1.0 x 10^-7mol^-1 . Its pH value is

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An aqueous solution has [H+] ion concentration = 1.0 x 10-7mol-1 . Its pH value is 

(a) +7 

(b) -7 

(c) 0.70 

(d) 10-7

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Correct answer is (a) +7

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