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At `90^(@)C` , pure water has `[H_(3)O^(+)]` as `10^(-6)` mol `L^(-1)`. What is the value of `K_(w)` at `90^(@)C` ?
A. `10^(-14)`
B. `10^(-8)`
C. `10^(-6)`
D. `10^(-12)`

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