A first order reaction has the rate constant, . The number of correct statement/s from the following is/are

Given:

A. Reaction completes in 1000 s.

B. The reaction has a half-life of 500 s.

C. T

Question

A first order reaction has the rate constant, . The number of correct statement/s from the following is/are

Given:

A. Reaction completes in 1000 s.

B. The reaction has a half-life of 500 s.

C. The time required for 10% completion is 25 times the time required for 90% completion.

D. The degree of dissociation is equal to .

E. The rate and the rate constant have the same unit.

Canvas Classes · Accepted Answer

A. FALSE — First order reactions never truly complete; they approach completion asymptotically. ✗

B. FALSE — . ✗

C. FALSE — , which is , not 25. ✗

D. TRUE — For first order: , so fraction decomposed . ✓

E. FALSE — Rate unit: ; rate constant unit for first order: . Different. ✗

Number of correct statements = 1 (D only)

Answer: 1

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