CBSE
Multiple Choice QuestionsAssertion : In rate law, unlike in the expression for equilibrium constants, the exponents for concentrations do not necessarily match the stoichiometric coefficients.
Reason : It is the mechanism and not the balanced chemical equation for the overall change that governs the reaction rate.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
A + 2B C + D , if
- = 5 x 10-4 mol L-1 s-1 , then - is
2.5 x 10-4 mol L-1 s-1
50 x 10-4 mol L-1 s-1
2.5 x 10-3 mol L -1 s-1
1.0 x 10-3 mol L -1 s-1
For a reaction A + B C + D if the concentration of A is doubled without alterning the concentration of B , the rate gets doubled . If the concentration of B is increased by nine times without alterning the concentration of A , the rate gets tripled .The order of the reaction is :
2
1
3/2
4/3
What is the half-life of 6C14 , if its disintegration constant is 2.31 x 10-4 yr-1 ?
0.3 x 104 yr
0.3 x 103 yr
0.3 x 108 yr
0.3 x 102 yr
Acid hydrolysis of sucrose is a
pseudo first order reaction
zero order reaction
second order reaction
unimolecular reaction.
Decay constant of a radioactive substance is 69.3 sec-1, find of the same substance.
4 × 10-2 sec
2 × 10-2 sec
1 × 10-2 sec
None of these
For the reaction, 2NO2 + F2 2NO2F, following mechanism has been provided.
Thus, rate expression of the above reaction can be written as
r= k [NO2]2[F2]
r = k [NO2][F2]
r = k [NO2]
r = k [F2]
Which of the following reactions end infinite time ?
Zero order
1st order
2nd order
3rd order
In a homogenous reaction, A B + C + D the initial pressure was P0 and after time t it was P. Expression for rate constant k in terms of P0, P and t will be
Which curve corresponds to the temperature dependence of the rate R of a simple one step reaction?
