19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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 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)
Formula for half-life of a zero order reaction is (JIPMER 2019) (a) C k (b) C 2k (c) 2C k (d) 2C 2k
If half-life of a substance is 36 minutes. Find amount left after 2 hrs. Initial amount is 10 g. (JIPMER 2019)
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
The correct difference between first and second order reactions is that (NEET 2018)
When initial concentration of the reactant is doubled, the half-life period of a zero order reaction (NEET 2018)
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)
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)
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)
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.…
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 …