IIT-JEE 2010 · Paper 1 · Chemistry Q6

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ChemistrySingle correct+3 / -1Question 6 of 84

Plots showing the variation of the rate constant (k) with temperature (T) are given below. The plot that follows Arrhenius equation is

k against T: starts near zero and rises ever more steeply (concave up, exponential-like).

k against T: a straight line rising from a positive intercept.

k against T: starts high and decays towards zero (concave up, decreasing).

k against T: a straight line falling from a positive intercept.

Answer and worked solution

Official answer: A

Arrhenius equation. $k=Ae^{-E_a/RT}$ . At low temperatures $k$ is very small, and it grows faster and faster as $T$ rises (over the usual range), so the plot of $k$ against $T$ curves upward from near zero.

(B) and (D) are straight lines, and (C) decreases with $T$ , which is not Arrhenius behaviour.

(A)

Topics:Arrhenius equation

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IIT-JEE 2010 · Paper 1, Chemistry question 6