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
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
Half-life of radioactive substance is 4 days . Amount of the substance decayed in two days is :
1 -
20 %
Half-life pf a radioactive element is :
0.693
C.
For 1st order reactions (like radioactive decay) _ t1/2 =
Assertion : The kinetics of the reaction
mA + nB + pC → m'X + n'Y + p'Z
obeys the reaction as- = k[A]m[B]n
Reason : The rate of reaction does not depend upon the concentration of C.
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.
For reaction aA → xP, when [A] = 2.2 mM, the rate was found to be 2.4 mM s-1. On reducing concentration of A to half, the rate changes to 0.6 mM s-1. The order of reaction with respect to A is
1.5
2.0
2.5
3.0
Assertion : According to transition state theory, for the formation of an activated complex, one of the vibrational degrees of freedom is converted into a translational degree of freedom.
Reason: Energy of the activated complex is higher than the energy of reactant molecules.
If both assertion and reason are true and reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true, but reason is false.
Both assertion and reason are false statements.