1
AIEEE 2003
+4
-1
The radionucleide $${}_{90}^{234}Th$$ undergoes two successive $$\beta$$ -decays followed by one $$\alpha$$-decay. The atomic number and the mass number respectively of the resulting radionucleide are
A
94 and 230
B
90 and 230
C
92 and 230
D
92 and 234
2
AIEEE 2003
+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
3
AIEEE 2003
+4
-1
In respect of the equation k = Ae-Ea/RT in chemical kinetics, which one of the following statements is correct?
A
B
Ea is energy of activation
C
R is Rydberg’s constant
D
k is equilibrium constant
4
AIEEE 2003
+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
$${1 \over {{2^{(m + n)}}}}$$
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