1
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
The half-life of a radioactive isotope is three hours. If the initial mass of the isotope were 256 g, the mass of it remaining undecayed after 18 hours would be
A
8.0 g
B
12.0 g
C
16.0 g
D
4.0 g
2
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
In respect of the equation k = Ae-Ea/RT in chemical kinetics, which one of the following statements is correct?
A
A is adsorption factor
B
Ea is energy of activation
C
R is Rydberg’s constant
D
k is equilibrium constant
3
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
The rate law for a reaction between the substances A and B is given by Rate = k[A]n [B]m On doubling the concentration of A and halving the concentration of B, the ratio of the new rate to the earlier rate of the reaction will be as
A
(m + n)
B
(n - m)
C
2( n - m)
D
$${1 \over {{2^{(m + n)}}}}$$
4
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
For the reaction system:

2NO(g) + O2(g) $$\to$$ 2NO2(g) volume is suddenly reduce to half its value by increasing the pressure on it. If the reaction is of first order with respect to O2 and second order with respect to NO, the rate of reaction will
A
diminish to one-eighth of its initial value
B
increase to eight times of its initial value
C
increase to four times of its initial value
D
diminish to one-fourth of its initial value
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