Identify the correct statement from the following in a chemical reaction.

The entropy always increases

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The change in entropy along with suitable change in enthalpy decides the rate of reaction

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The enthalpy always decreases

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Both the enthalpy and the entropy remains constant

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Solution

The correct option is A The change in entropy along with suitable change in enthalpy decides the rate of reaction
$Δ G (T, P) = Δ H - T Δ S$ gives the free energy of system.

When $Δ G (T, P) < 0$ , the reaction is spontaneous.
When $Δ G (T, P) > 0$ , the reaction is non-spontaneous.

Hence, entropy changed with a suitable change in enthalpy will decide the rate of the reaction.

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