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Which of the following is the weakest acid? A Phenol ( K a ​ = 1 . 3 × 1 0 − 1 0 ) B Hydrocyanic acid ( K a ​ = 4 . 9 × 1 0 − 1 0 ) C Acetic acid ( K a ​ = 1 . 8 × 1 0 − 1 0 ) D Benzoic acid ( K a ​ = 6 . 5 × 1 0 − 1 0 )

Which of the following is the weakest acid?

A

Phenol (Ka=1.3×1010)

B

Hydrocyanic acid (Ka=4.9×1010)

C

Acetic acid (Ka=1.8×1010)

D

Benzoic acid (Ka=6.5×1010)

 
 
 

Grade:11

3 Answers

Vikas TU
14149 Points
10 months ago
Dear student 
The weak acid among following is Phenol 
Because it is having least Ka value , among all four. 
So correct option is A. 
Hope this will help 
Good Luck 
ankit singh
askIITians Faculty 614 Points
10 months ago
please go through the solution 
 solve by askiitians faculty
 ankit singh 

 

A large Ka value indicates a strong acid because it means the acid is largely dissociated into its ions.
A small Ka value means little of the acid dissociates, then it is a weak acid.
 
∴ Phenol is the weakest acid.
 manir bhopal 
 all the best for your futurew endutrewd
adilakshmigogada 27
101 Points
9 months ago
A large Ka value indicates a strong acid because it means the acid is largely dissociated into its ions.
A small Ka value means little of the acid dissociates, then it is a weak acid.
 
∴ Phenol is the weakest acid.
 manir bhopal 
 all the best for your futurew endutrewd 

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