AIEEE 2003 | Chemical Kinetics and Nuclear Chemistry Question 161 | Chemistry

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

8.0 g

12.0 g

16.0 g

4.0 g

AIEEE 2003

MCQ (Single Correct Answer)

-1

In respect of the equation k = Ae^-E_a/RT in chemical kinetics, which one of the following statements is correct?

A is adsorption factor

E_a is energy of activation

R is Rydberg’s constant

k is equilibrium constant

AIEEE 2003

MCQ (Single Correct Answer)

-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

(m + n)

(n - m)

2^{( n - m)}

$${1 \over {{2^{(m + n)}}}}$$

AIEEE 2003

MCQ (Single Correct Answer)

-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

diminish to one-eighth of its initial value

increase to eight times of its initial value

increase to four times of its initial value

diminish to one-fourth of its initial value

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