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Physical and Chemical Changes

Why is it sai...

Question

Why is it said that if the forward reaction is exothermic and the temperature is increased, the yield of products is decreased. If the temperature is decreased, the yield of products is increased?

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Solution

Already the reaction is exothermic and the increase of temperature will increase the heat energy. Now the stress in the form of heat should be removed from the system so that more yield of product is produced. That is why decrease of temperature in exothermic reaction favours more yield.

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Q. In Haber's process, yield of ammonia decreases when the temprature is increased above 550

^{o} C

because forward reaction is exothermic.

For an exothermic reaction like the production of ammonia, if the temperature of the reaction is increased the reaction ____

Q. The oxidation of

S O_{2}

O_{2}

S O_{3}

is an exothermic reaction. The yield of

S O_{3}

will be maximum if the:

Q. For a reversible equilibrium reaction

K_{C} > K_{P}

298 K

Δ H = + 200

K J

, the forward reaction is favoured if:
(i) Pressure is increased
(ii) Temperature is increased
(iii) Temperature is decreased
(iv) Increasing the concnetration of reactants

Statement (A): Increase in temperature favours the endothermic reaction

Statement (B): Decrease in temperature favours the exothermic reaction

Statement (C): There is no effect of pressure on equilibrium if the number of moles of gaseous reactants and products are different.

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