Chemistry Question Bank

Half-life period of a first order reaction is 10 min. What percentage of the reaction will be completed in 100 min?

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…

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…

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

Which of the following statement(s) is/are true?

Expression for the half-life of zero order reaction is given as (a) 1/2 R t 2k (b) 0 1/2 R t 2k (c) 1/2 0.693 t k (d) 1/2 0.301 t k Ans. (b) Sol. 0 1/2 R t 2k For a zero order reaction.

Value of 1/2 t for first order reaction is (a) (b) (c) (d) Ans. (a) Sol. Value of t1/2 for first order reaction is 0.693 k

1/2 t for a zero order reaction is …(I)… proportional to the initial concentration of the reactants and …(II)… proportional to the rate constant. Choose the correct words to fill up the blanks (I) and (II) respectivel…

…A… of the reaction is the time in which the concentration of a reactant is reduced to one half of its initial concentration. Choose the appropriate word to fill ‘A’ from the options given below.

For a given reaction half life period was found to be directly proportional to the initial concentration of the reactant. The order is

For the first order reaction A ⟶ Products, which one of the following is the correct plot of log [A] versus time? (a) (b) (c) (d)

The rate constant for a zero order reaction is 2 × 10–2 mol L–1 sec–1. If the concentration of the reactant after 25 sec is 0.5 M, the initial concentration must have been

…A… dependence of rate is called differential rate equation. Choose the suitable word to replace A.

Assertion (A) Molecularity of a reaction can have a fractional value. Reason (R) Order of a reaction can have a fractional value.

Assertion (A) The reaction, H Br 2HBr -> has a molecularity of two. Reason (R) Order of reaction is 3/2.

The reaction, 2N O 4NO O is

Four reactions are given below. Which one of them is of zero order? (a) PCl PCl Cl -> (b) 2FeCl SnCl 2FeCl SnCl -> (c) H Cl 2HCl -> (d) N O 2NO O -> Ans. (c) Sol. The order of all photochemical reactions is zero …

Choose the correct answer out of the following choices. Assertion (A) Order and molecularity are different. Reason (R) Order can be determined experimentally and molecularity is the sum of the stoichiometric coefficie…

Choose the correct answer out of the following choices. Assertion (A) Some zero order reactions may have order in fractions. Reason (R) Order cannot be determined from balanced chemical equation.

Which of the following statement(s) is/are correct about order of a reaction? I.The order of a reaction can be a fractional number. II.Order of a reaction is experimentally determined quantity. III.The order of a reac…

Consider the data given below for a hypothetical reactions M N -> Times(s) Rate of reaction (mol L-1 s-1) 4.20 × 10-4 4.20 × 10-4 4.20 × 10-4 4.20 × 10-4 4.18 × 10-4 For the above data, the order of reaction is

Statement I For a complex reaction, order is given by the slowest step of the reaction. Statement II Molecularity of the slowest step is same as the order of the overall reaction. Which of these statement(s) is/are tr…

2NO O 2NO ->

2HI H I -> C. Trimolecula r

NH NO N 2H O -> B. Bimolecular