19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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)
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)
When the rate of reaction is independent of the concentration of reactants, then the order of that chemical reaction is
I. Order of a reaction can be 0, 1, 2, 3…. II. Order of a reaction can never be a fraction. Which of the above statement(s) is/are true? Choose the correct option.