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Q.

Which of the following (1M) conducts more electricity ?
 

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a

phosphorous acid

b

boric acid
 

c

sulphuric acid
 

d

acetic acid
 

answer is A.

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Detailed Solution

  • More the number of ions especially smaller cations (hydrated H+ ions) more the conductivity. 
  • At 1 M concentration weak acids like H3PO3 , H3BO3 will be weakly dissociated resulting in poor conductivity of HNO3 and H2SO4 both strong acids.
  •  H2SO4 solution will be more conducting due to larger number of H+ ions in solution.
  • H2SO4⇌H++HSO4- HSO4-⇌H++SO42-
  • So, it can be observed that H2SO4 is completely ionized.
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