Equal volumes of following solutions are...

Equal volumes of following solutions are mixed in which case the pH of resulting solution will be average value of pH of two solutions?

A

HCl (pH = 2) and NaOH (pH= 12)

B

HCl (pH = 2 ) and HCl (pH=4)

C

HCN (pH=2) and NaOH (pH=12)

D

`CH_(3)COOH (pH=5)and NH_(3)aq (pH=9) `

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