pH at which a basic indicator with `K_("in")=1xx10^(-10)` changes colour when the indicator is `xx10^(-2)M` is
pH at which a basic indicator with `K_("in")=1xx10^(-10)` changes colour when the indicator is `xx10^(-2)M` is
A. 8
B. 4
C. 2
D. 10
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Correct Answer - B
`pOH =pK_("in")("basic")=-log 10^(-10)=10`
`pH =14-pOH =14-10=4`
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