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  • Which of the following has highest  value?Option: 1</st

Which of the following has highest \mathrm{pK_a} value?

Option: 1

HI


Option: 2

HBr


Option: 3

HCl


Option: 4

HF


Answers (1)

best_answer

As we have learnt,

Acidic strength of Hydrides of Group 17 elements increases down the group. This is because of the stability of the conjugate base which is predominantly governed by the size of the orbital in which the negative charge is diffused in.

Thus the order of \mathrm{Ka} value is given as 

\mathrm{HI>HBr>HCl>HF}

Now, since \mathrm{pKa=-log(Ka)}, the order of \mathrm{pKa} values for these are given as :

\mathrm{HI<HBr<HCl<HF}

Therefore, option(4) is correct

Posted by

Ritika Harsh

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