A first-order reaction is 50 % completed in 1.26 x 10¹⁴ s. The time required for 100 % completion
of the reaction will be:

1. 1.26 × 10¹⁵ s

2. 2.52 × 10¹⁴ s

3. 2.52 × 10²⁸ s

4. Infinite

Compounds A and B react according to the following chemical equation.

A(g) + 2B(g) $\stackrel{}{\to }$ 2C(g)

The concentration of either A or B was changed keeping the concentrations of one of the reactants constant and rates were measured as a function of initial concentration. The following results were obtained. Choose the correct option for the rate equations for this reaction.

$1. \mathrm{Rate} = \mathrm{k}{\left[\mathrm{A}\right]}^2\left[\mathrm{B}\right]$
$2. \mathrm{Rate} = \mathrm{k}\left[\mathrm{A}\right]{\left[\mathrm{B}\right]}^2$
$3. \mathrm{Rate} = \mathrm{k}\left[\mathrm{A}\right]\left[\mathrm{B}\right]$
$4. \mathrm{Rate} = \mathrm{k}{\left[\mathrm{A}\right]}^2{\left[\mathrm{B}\right]}^0$

An incorrect statement regarding the catalyst is:

The value of the rate constant of a pseudo-first-order reaction-

Consider the reaction A$\to$B. The concentration of both the reactant and the product varies exponentially with time.

The graph that accurately depicts how reactant and product concentrations change with time is:

1.		2.
3.		4.

Rate law expression cannot be determined from a balanced chemical equation if.

a.  The reverse reaction is involved

b.  It is an elementary reaction

c.  It is a sequence of elementary reactions

d.  Any of the reactants is in excess

The correct choice among the given is -

1. (a, b, c)

2. (b, c, d)

3. (a, c, d)

4. (a, b, d)

The correct statements among the following regarding a balanced chemical equation of an elementary reaction are-

1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

The correct statements among the following regarding any unimolecular reaction are-

1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

The correct statements among the following regarding a complex reaction are-

1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

At high pressure the following reaction is zero order-

The correct statements among the following is: