Chemistry Question Bank

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.…

The rate of the reaction g g g NO Cl NOCl is given by the rate equation rate = k [NO]2 [Cl2]. The value of the rate constant can be increased by: (AIPMT 2010)

For the reaction [N2O5(g) -> 2NO2(g) + 1/2 O2(g)] the value of rate of disappearance of N2O5 is given as 6.25 × l0–3 mol L–1 s–1 The rate of formation of NO2 and O2 is given respectively as: (AIPMT 2010)

The rate law for the reaction, xA yB mP nQ -> is rate = . c d k A B What is the total order of the reaction? (Kerala CEE 2011)

The half-life of a substance in a certain enzyme- catalysed reaction is 138 s. The time required for the concentration of the substance to fall from 1.28 mg L– 1 to 0.04 mg L–1 is (AIPMT 2011)

The unit of rate constant for a zero-order reaction is. (AIPMT 2011 M)

Which one of the following statements for the order of a reaction is incorrect? (AIPMT 2011)

The rate of the reaction 2N2O5 -> 4NO2 + O2 can be written in three ways: d N O k N O dt ' d NO k N O dt '' d O k N O dt The relationship between k and k' and between k and k" are; (AIPMT 2011 M)

Half-life of a reaction is found to be inversely proportional to the cube of initial concentration. The order of reaction is (AFMC 2012)

Activation energy (Ea) and rate constants (k1 and k2) of a chemical reaction at two different temperatures (T1 and T2) are related by: (AIPMT 2012) (a) ln a E k k R T T (b) ln a E k k R T T (c) ln a E …

In a zero-order reaction for every 10° rise of temperature, the rate is doubled. If the temperature is increased from 10°C to 100°C, the rate of the reaction will become: (AIPMT 2012)

In a reaction, A + B -> Product, rate is doubled when the concentration of B is doubled, and rate increases by a factor of 8 when the concentrations of both the reactants (A and B) are doubled. Rate law for the reacti…

A reaction having equal energies of activation for forward and reverse reaction has: (NEET 2013) (a) G (b) H (c) H G S (d) S

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)