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12/10/2021 11:39 am
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Values of dissociation constant, Ka are given as follows:
Acid Ka
HCN 6.2 × 10-10
HF 7.2 × 10-4
HNO2 4.0 × 10-4
Correct order of increasing base strength of the base CN-, F- and NO2- will be :
(a) F- < CN- < NO2-
(b) NO2- < CN- < F-
(c) F- < NO2- < CN-
(d) NO2- < F- < CN-
1 Answer
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12/10/2021 11:42 am
Correct answer: (c) F- < NO2- < CN-
Explanation:
Higher the value of Ka lower will be the value of pKa i.e. higher will be the acidic nature. Further CN-, F- and NO2- are conjugate base of the acids HCN, HF and HNO2 respectively hence the correct order of base strength will be F- < NO2- < CN-
(∵ stronger the acid weaker will be its conjugate base)