19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which of the following statement(s) is/are true?
A first order reaction is found to have a rate constant, k = 4.2 × 10-12 s-1. Find the half-life of the reaction
Suppose P is the initial concentration of reaction, then the half-life period of a reaction of nth order is proportional to (a) (b) (c) (d) Ans. (a) Sol. Relation between half-life period of a reaction and initial con…
For a hypothetical reaction, A P -> the rate constant is 0.12 s-1. Which of the following statements(s) is/are correct, if [R]0 is the initial concentration? (a) 0 1/2 R t 0.12 12 x (b) 1/2 t 2 0.12 R (c) 1/2 0.69…
Half-life period of a first order reaction is 10 min. What percentage of the reaction will be completed in 100 min?
10g of a radioactive isotope is reduced to 1.25 g in 12 yr. Calculate the half-life period of the isotope.
When one reactant is present in large excess in a chemical reaction between two substances, then the reaction is known as
Inversion of cane sugar in dilute acid is an example of
The value of rate constant of a pseudo first order reaction does not
What is true about pseudo first order reaction?
Consider the following equation, H CH COOC H H O CH COOH C H OH -> t = 0 0.01 mol 10 mol 0 mol 0 mol t 0 mol 9.9 mol 0.01 mol 0.01 mol I.The concentration of water does not get altered much during the course of the…
Assertion (A) The reaction mentioned in Above ques. behaves as pseudo first order reaction. Reason (R) Change in the concentration of H2O is negligible.
Match the terms of Column I with Column II and choose the correct option from the codes given below. Column I Column II A. Inversion of cane sugar 1. Zero order reaction B. Decomposition of N2O5
First order reaction C. Thermal decomposition of HI on gold surface
Pseudo order reaction A B C (a) (b) (c) (d)
The rate constant ‘k for pseudo first order reaction is (a) 2.303log C C t (b) 2.303 C log t C (c) 2.303log C C t (d) C 2.303log t C Ans. (d) Sol. The rate constant ‘k’ for pseudo first order reaction is C 2.303log …
The rate law for inversion of cane sugar is R=k [C12H22O11][H2O]. Find the concentration of sucrose if the rate of the reaction is 0.032 s-1 and rate constant k=0.005.
Which of the following is not similar between a first order and pseudo first order reaction?
For a homogeneous gaseous reaction, A B C D, -> in the initial pressure was P0 while pressure after time t was P. Expression for rate constant K in terms of P0, P and t is: (a) 2P 2.303 K log t 3P P (b) 4P…
Half-life a reaction is found to be inversely proportional to the cube of its initial concertration. Order of reaction is
Consider some facts about decomposition of H2O2. I.It is catalyzed by iodide ion in acidic or alkaline medium. II.It is second order reaction with respect to both H2O2 and I- III.Rate equation of this particular react…
The initial concentration of N2O5 in the following order reaction, N O g 2NO g g -> was 1.24 10 molL x at 318 K. The concentration of N2O5 after 60 min was 0.20 × 10-2 mol L-1. Calculate the rate constant of the…
Most of the chemical reactions are accelerated by …A… in temperature. Here, A refers to
For a chemical reaction with rise in temperature by 10oC, the rate constant is nearly …A…, Here, A refers to
The rate of reaction is doubled for every 10ºC rise in temperature. The increase in rate as result of increase in temperature from 10ºC to 100ºC is