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Q.

Identify the strongest base among the following if the  Ka values given are  HSO4=1.2×102;H2PO4=6.3×108;HCO3=4.7×1011

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a

CO32

b

H2SO4

c

SO42

d

HPO42 

answer is A.

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Detailed Solution

HCO3  is weakest acid as the  Ka value is lowest. Weak acid has a strong conjugate base. Conjugate base of HCO3 is CO3 which is a strong conjugate base.

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