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Q.

Which is the weakest acid?

 

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a

ascorbic acid Ka=8.0×10−5

b

butyric acid Ka=1.5×10−5

c

hydrocyanic acid Ka=4.9×10−10

d

boric acid Ka=5.8×10−10

answer is D.

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Detailed Solution

Lower the ka value, weaker the acid. 

Here, the value of ka of hydrocyanic acid is less among the given options.

Thus, it is weaker acid compare to other.

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