Chemistry Question Bank

For the reaction 4 A B C D -> , which of the following statement is not correct ?

For a reaction A → B, enthalpy of reaction is -4.2 kJ mol-1 and enthalpy of activation is 9.6 kJ mol-1. The correct potential energy profile for the reaction is shown in option. (NEET 2021) (a) (b) (c) (d)

The slope of Arrhenius plot (ln k v/s 1/T) of first order reaction is 5 10 . K x The value of a E of the reaction is. Choose the correct option for your answer. (Given R = 8.314 Jk-1 mol-1) (NEET 2021)

An increase in the concentration of the reactants of a reaction leads to change in: (NEET 2020)

The rate constant for a first order reaction is 4.606 10 s x . The time required to reduce 2.0 g of the reactant to 0.2 g is: (NEET 2020)

The half-life for a zero order reaction having 0.02 M intial concetration of reactant is 100 s. The rate constant (in mol L-1 s-1) for the reaction (NEET 2020) (a) 1.0 10 x (b) 2.0 10 x (c) 2.0 10 x (d) 1.0 10 x

If the rate constant for a first order reaction is k, the time (t) required for the completion of 99% of the reaction is given by: (NEET 2019)

For the chemical reaction: (NEET 2019) N g H g NH g The correct option is: (a) d N d NH dt dt (b) d N d NH dt dt (c) d H d NH dt dt (d) d H d NH dt dt

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

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)

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

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…

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)

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 …

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

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)

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)

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)

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)

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

rate = k [A]1 [B]2

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 …

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. …

The rate constants k1 and k2 for two different reactions are 1016. 2000/T e and 1015. 1000/T e , respectively. The temperature at which k1 = k2 is: (AIPMT 2008)