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20$$ \mathrm { cm } ^ { 3 } $$ of $$ \times M $$ solution of H C l is exactly neutralised by 40$$ \mathrm { cm } ^ { 3 } $$ of 0.05 M NaOH solution, the ph of HCl solution before neutralization is

A
2
B
2.5
C
1.5
D
1.0
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Correct option is A. 1.0

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