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Q.

At 25∘C,H3O+=1×10−7M in water , hence Ka is

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a

1×10−14

b

5.55×10−15

c

1.8×10−16

d

55.5×10−10

answer is C.

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Detailed Solution

H3O+=1×10−7M=KaC  For H2O,H2O=1g/mL=1000g/L=100018M ∴1000Ka18=1×10−7 ∴ Ka=1.8×10−16
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