Chemistry Question Bank

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)

The correct difference between first and second order reactions is that (NEET 2018)

Find out time period of Ist order reaction when reaction complete 2/3rd, if the value of rate constant is 4.3 10 s x (JIPMER 2019) (a) 0.0025 10 sec x (b) 0.25 10 sec x (c) 0.025 10 sec x (d) 2.5 10 sec x

If half-life of a substance is 36 minutes. Find amount left after 2 hrs. Initial amount is 10 g. (JIPMER 2019)

Formula for half-life of a zero order reaction is (JIPMER 2019) (a) C k (b) C 2k (c) 2C k (d) 2C 2k

For a reaction, activation energy Ea = 0 and the rate constant at 200 K is 1.6 × 106 s–1. The rate constant at 400 K will be: [Given that gas constant R=8.314 J K–1 mol–1] (Odisha NEET 2019)

A first order reaction has a rate constant of 2.303 × 10– 3 s–1. The time required for 40 g of this reactant to reduce to 10 g will be: [Given that log10 2 = 0.3010 (Odisha 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

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)

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

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)

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

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)

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)

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

With passage of time, the concentration of reactants …A… and rate of reaction …B… . Here A and B are

Select the rate law that corresponds to the data shown for the following reaction A B C -> Expt. (A) (B) Initial rate 0.012 0.035 0.10 0.024 0.070 0.80 0.024 0.035 0.10 0.012 0.070 0.80

For the following reaction: NO2(g) + CO(g) ->NO(g) + CO2(g), the rate law is: Rate = k [NO2]2.If 0.1 mole of gaseous carbon monoxide is added at constant temperature to the reaction mixture which of the following stat…

The following data pertains to reaction between A and B : S. No. [A] mol L–1 [B] mol L–1 Rate (mol L–1 time–1) 1 1.0 × 10–2 2.0 × 10–2 2.0 × 10–4 2 2.0 × 10–2 2.0 × 10–2 4.0 × 10–4 3 2.0 × 10–2 4.0 …

A reaction which is of first order w.r.t. reactant A, has a rate constant 6 min–1. If we start with [A] = 0.5 mol L–1, when would [A] reach the value of 0.05 mol L–1

T50 of first -order reaction is 10 min. Starting with 10 mol L–1, rate after 20 min is

Half-lives of a first order and a zero order reaction are same. Then the ratio of the initial rates of first order reaction to that of the zero order reaction is (a) 0.693