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CBSE 12th Standard Chemistry Subject Chemical Kinetics Ncert Exemplar 2 Mark Questions With Solution 2021

Published on: 25/05/2021

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Std: 12th Standard CBSE - Chemistry

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Questions:

Generic 2

4 x 2 = 8

Thermodynamic feasibility of the reaction alone cannot decide the rate of the reaction. Explain with the help of the one example .

Why does the rate of any reaction generally decreases during the course of the reaction ?

Why is the probability of reaction with molecularity higher than three very rare?

The reaction between H₂ (g) and O₂ (g) is highly feasible yet allowing the gases to stand at room temperature in the same does not lead to the formation of water. Explain

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Answers Key:

Generic 2

4 x 2 = 8

Thermodynamic feasibility\(\left( -ve\ \Delta G \right) \) cannot alone decide the rate of reaction because the reaction may be feasible but its rate may be very very slow because of very high activation energy. For example, conversion of diamond to graphite is highly feasible but this reaction is very slow because it has high activation energy.

The rate of reaction depends upon concentrations of reactants proceeds, reactants are consumed, Hence, their concentration decreases and so the rate reaction decreases.

This is because the probability of more than three molecules to collide simulataneously is very small.

This is because activation energy of the reaction is very high at room temperature.