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Question

Which of the following statements is correct ?
(a) The rate of reaction decreases with passage of time as the concentration of reactants decreases 
(b) The rate of reaction is same at any time during the reaction
(c) The rate of a reaction is independent of temperature change 
(d) The rate of a reaction decreases with increase in concentration of reactant (s) 


Solution

Answer: (a).

The rate of reaction is defined as the rate of decrease of concentration of any one of the reactants with the passage of time 

Rate of reaction=Rate of disappearance of reactantTime takenr=dxdt Thus, as the concentration of reactant decreases with passage of time, rate of reaction decreases. 


Chemistry
NCERT Exemplar
Standard XII

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