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Elementary and Complex Reactions

On increasing...

Question

On increasing temperature, the equilibrium constant of exothermic and endothermic reactions __ and respectively:

A

increases and decreases

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B

decreases and increases

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C

increases and increases

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D

decreases and decreases

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Solution

The correct option is B decreases and increases
Exothermic Reactions
If $K_{c}$ decreases with an increase in temperature, the reaction shifts to the left.
If $K_{c}$ increases with a decreases in temperature, the reaction to shifts to the right.
Endothermic Reactions
If $K_{c}$ increases with an increase in temperature, the reaction to shifts to the right.
If $K_{c}$ decreases with a decrease in temperature, the reaction to shifts to the left.

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Q. The standard reaction Gibbs energy for a chemical reaction at an absolute temperature T is given

△_{r} G^{\circ} = A - B T,

where A and B are non-zero constants. Which of the following is true about this reaction?

Q. For a reaction taking place in a container in equilibrium with its surroundings, the effect of temperature on its equilibrium constant K in terms of change in entropy is described by:

Q. Assertion :The value of K for a reaction may increase or decrease with increase in temperature depending upon whether the reaction is exothermic or endothermic. Reason: With increase in temperature, the extent of reaction increases.

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.

Q. The variation of K and

K_{f}

K_{b}

with temperature shows the following effects:
(i) For endothermic reaction K increases and

K_{f}

K_{b}

also increases with temperature.
(ii) For endothermic reaction K decreases and

K_{f}

K_{b}

also decreases with temperature.
(iii) For exothermic reaction K decreases and

K_{f}

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both increases with temperature.
(iv) For exothermic reaction K increases and

K_{f}

K_{b}

decreases with temperature.
(v) For exothermic reaction K decreases and

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both decreases with temperature.

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