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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.
$H_{2} {SO}_{4} ⇌ H^{+} + {HSO}_{4}^{(-)} {HSO}_{4}^{(-)} ⇌ H^{+} + {SO}_{4}^{2 -}$
So, it can be observed that H₂SO₄ is completely ionized.

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