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Solution


Q.

A → product (First order reaction)

Three sets of experiments were performed for a reaction under similar experimental conditions:

Run 1 ⇒ 100 mL of 10 M solution of reactant A

Run 2 ⇒ 200 mL of 10 M solution of reactant A

Run 3 ⇒100 mL of 10 M solution of reactant A + 100 mL of H2O added

The correct variation of rate of reaction is:                      [2026]
1 Run 3 < Run 1 < Run 2  
2 Run 3 < Run 1 = Run 2  
3 Run 1 < Run 2 < Run 3  
4 Run 1 = Run 2 = Run 3  

Ans.

(2)

For 1st order reaction

Rate = k[A]

with decrease in concentration of A, rate of reaction decreases.