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Grade: 11

                        

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)

 
 
 

4 months ago

Answers : (3)

Vikas TU
14149 Points
							
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 
4 months ago
ankit singh
askIITians Faculty
606 Points
							
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
4 months ago
adilakshmigogada 27
101 Points
							
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 
3 months ago
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