JEE Advanced 2013 · Paper 1 · Chemistry Q29

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ChemistrySingle correct+2Question 29 of 60

In the reaction,
$\ce{P + Q -> R + S}$
the time taken for 75% reaction of P is twice the time taken for 50% reaction of P. The concentration of Q varies with reaction time as shown in the figure. The overall order of the reaction is

[Q] against time: a straight line falling from [Q]₀ on the vertical axis to zero on the time axis.

Answer and worked solution

Official answer: D

Order in P. $t_{75\%}=2t_{50\%}$ holds for a first-order reaction.

Order in Q. [Q] falls linearly with time: zero order in Q.

Overall 1 + 0 = 1.

(D)

Topics:Order and molecularity Integrated rate equations

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JEE Advanced 2013 · Paper 1, Chemistry question 29