KVPY 2019 SB SX Exam Previous Papers

Question : 52 of 120

Marks: +1, -0

For a 1

^{\st}

order chemical reaction

the product formation rate is independent of reachant concentration
the times taken for the completion of half of the reaction $(t_{1\/2})$ is 69.3% of the rate constant (k)
the dimension of Arrhenius pre-exponential factor is reciprocal of time
the concentration vs time plot for the reactant should be linear with a negative slope

Solution:

K=Ae^{-{Ea}/{RT}}

For 1

^{\st}

order reactime unit of k = time

^{–1}

and for A unit is same as unit of K.

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