Which of the following salts will have maximum cooling effect when $0.5$ mole of the salt is dissolved in same amount of water. Integral heat of solution at $298 K$ is given for each salt.

K N O_{3} (Δ = 35.4 k J m o l^{- 1})

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N a C l (Δ = 5.35 k J m o l^{- 1})

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H B r (Δ = 83.3 k J m o l^{- 1})

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K O H (Δ = 55.6 k J m o l^{- 1})

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Solution

The correct option is A $K N O_{3} (Δ = 35.4 k J m o l^{- 1})$
More the heat absorbed, more will be the cooling effect. Hence more the positive value of $Δ H$ more the cooling effect.In the given question KBr has $Δ H = 83.3 k J m o l^{-}$ which is highest among all the gases.

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Which of the following salts when dissolved in water will get hydrolysed to form an acidic solution?

A B

298 K

1.85 \times 10^{- 5} S m^{- 1}

A B

298 K

Λ_{m}^{o} (A B) = 140 \times 10^{- 4} S m^{2} {m o l}^{- 1}

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