Chemistry Question Bank

On the basis of Arrhenius equation mentioned in Above ques. consider the following statements. I.Ea is activation energy. II.Unit of Ea is J mol-1 III.R is gas constant. Which of these are true statements?

In the Arrhenius equation, a E /RT k Ae , the factor a E /RT e corresponds to the

What will happen, on increasing the temperature or decreasing the activation energy (answer on the basis of Arrhenius equation)?

The bromination of acetone that occurs in acid solution is represented by this equation. CH COCH aq Br aq CH COCH Br aq H aq Br aq -> These kinetic data were obtained for given reaction concentrations. …

For the reaction A + B -> products, it is observed that: (1) On doubling the initial concentration of A only, the rate of reaction is also doubled and (2) On doubling the initial concentrations of both A and B, there …

rate = k [A]1 [B]2

Half life period of a first-order reaction is 1386 seconds. The specific rate constant of the reaction is: (AIPMT 2009) (a) 0.5 10 s x (b) 0.5 10 s x (c) 5.0 10 s x (d) 5.0 10 s x

In the reaction -> aq aq l l BrO Br H Br H O The rate of appearance of bromine (Br2) is related to rate of disappearance of bromide ions as following: (AIPMT 2009)

For the reaction, N2 + 3H2 -> 2NH3, d NH dt = 2 x 10–4 mol L–1 s–1, the value of d H dt would be: (AIPMT 2009)

For an endothermic reaction, energy of activation is Ea and enthalpy of reaction of H (both of these in kJ/mol). Minimum value of Ea will be. (AIPMT 2010)

During the kinetic study of the reaction, 2A B C D -> , following results were obtained: Run [A]/mol L–1 [B]/mol L–1 Initial rate of formation of D/mol L–1 min–1 I 0.1 0.1 6.0 10 x II 0.3 0.2 7.2 10 x III 0.3 0.4 2.…

What is the activation energy for a reaction if its rate doubles when the temperature is raised from 20°C to 35°C? (R = 8.314 J mol–l K–l) (NEET Kar. 2013)

For a reaction between A and B the order with respect to A is 2 and the order with respect to B is 3. The concentrations of both A and B are doubled, the rate will increase by a factor of: (NEET Kar. 2013)

A reaction is 50% completed in 2 hours and 75% completed in 4 hours. The order of reaction is (NEET Kar. 2013)

The inversion of cane sugar is first order in [sugar] and proceeds with half-life of 600 minutes at pH = 4 for a given concentration of sugar. However, if pH = 5, the half-life changes to 60 minutes. The rate law expr…

The activation energy of a reaction can be determined from the slope of which of the following graphs? (NEET 2015)

When initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction is: (NEET 2015)

The rate constant of the reaction A ->B is 0.6 × 10–3 mol L-1 second-1. If the concentration of A is 5 M then concentration of B after 20 minutes is: (NEET 2015 RS)

The decomposition of phosphine (PH3) on tungsten at low pressure is a first-order reaction. It is because the: (NEET II 2016)

The addition of a catalyst during a chemical reaction alters which of the following quantities? (NEET 2016)

The rate of a first-order reaction is 0.04 mol L s at 10 seconds and 0.03 mol L s at 20 seconds after initiation of the reaction. The half-life period of the reaction is. (NEET 2016)

A first order reaction is 50% completed in 1.26 10 x s. How much time would it take for 100% completion? (JIPMER 2017) (a) 1.26 10 s x (b) 2.52 10 s x (c) 2.52 10 s x

A first order reaction has a specific reaction rate of 10– 2 sec–1. How much time will it take for 20g of the reactant to reduce to 5 g? (NEET 2017)

Mechanism of a hypothetical reaction X Y XY -> is given below: (i) fast X X X (ii) slow -> X Y XY Y (iii) fast X Y XY -> The overall order of the reaction will be; (NEET 2017)

When initial concentration of the reactant is doubled, the half-life period of a zero order reaction (NEET 2018)