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When in any system at equilibrium state ...

When in any system at equilibrium state pressure, temperatue and concentration is changed then the equilibria shifted to such a direction which neutralize the effect of change. This is known as

A

First law of thermodynamics

B

Le-chatelier's principle

C

Ostwald's rule

D

Hess's law of constant heat summation

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The correct Answer is:
To solve the question, we need to identify the principle that describes how a system at equilibrium responds to changes in pressure, temperature, and concentration. This principle is crucial in understanding chemical equilibrium. ### Step-by-Step Solution: 1. **Understanding Equilibrium**: In a chemical reaction at equilibrium, the rates of the forward and reverse reactions are equal, and the concentrations of reactants and products remain constant. 2. **Identifying Changes**: When there is a change in pressure, temperature, or concentration, the equilibrium position can shift. This shift occurs to counteract the change imposed on the system. 3. **Le Chatelier's Principle**: This principle states that if an external change is applied to a system at equilibrium, the system will adjust itself to partially counteract the effect of that change and restore a new equilibrium. 4. **Application of the Principle**: - If the concentration of a product is increased, the equilibrium will shift towards the reactants to decrease that concentration. - If the concentration of a reactant is decreased, the equilibrium will shift towards the products to increase that concentration. - If pressure is increased, the equilibrium will shift towards the side with fewer moles of gas. - If temperature is increased, the equilibrium will shift in the endothermic direction (absorbing heat). 5. **Conclusion**: The principle that describes this behavior is known as Le Chatelier's Principle. ### Final Answer: This phenomenon is known as **Le Chatelier's Principle**. ---
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