Q.

Which of the following are the conjugate bases of the given acids?HClO4,HCl,HBr,HI,HNO3 and H2SO4

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a

ClO3-,Cl-,Br-,I-,NO32- and H2SO4-

b

ClO3-,Cl-,Br-,I,NO32- and SO42-

c

ClO4-,Cl-,Br-,I,NO3-and SO42-

d

ClO4-,Cl-,Br-,I-,NO3-and HSO4-

answer is D.

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Detailed Solution

Strong acids like perchloric acid (HClO4), hydrochloric acid (HCl), hydrobromic acid (HBr), hydroiodic acid (HI), nitric acid (HNO3) and sulphuric acid (H2SO4) will give conjugate base ions  ClO4-,Cl-,Br-,1-,NO3-and HSO4-, , which are much weaker bases than H2O.
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