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12
MCQ (Single Correct Answer)

Which of the following expressions is correct for the rate of reaction given below?

$$5 \mathrm{Br}^{-}(a q)+\mathrm{BrO}_3^{-}(a q)+6 \mathrm{H}^{+}(a q) \rightarrow 3 \mathrm{Br}_2(a q)+3 \mathrm{H}_2 \mathrm{O}(l)$$

A
$\frac{\Delta\left[\mathrm{Br}^{-}\right]}{\Delta t}=5 \frac{\Delta\left[\mathrm{H}^{+}\right]}{\Delta t}$
B
$\frac{\Delta\left[\mathrm{Br}^{-}\right]}{\Delta t}=\frac{6}{5} \frac{\Delta\left[\mathrm{H}^{+}\right]}{\Delta t}$
C
$\frac{\Delta\left[\mathrm{Br}^{-}\right]}{\Delta t}=\frac{5}{6} \frac{\Delta\left[\mathrm{H}^{+}\right]}{\Delta t}$
D
$\frac{\Delta\left[\mathrm{Br}^{-}\right]}{\Delta t}=6 \frac{\Delta\left[\mathrm{H}^{+}\right]}{\Delta t}$
13
MCQ (Single Correct Answer)

Which of the following graphs represents exothermic reaction?

A
Only (I)
B
Only (II)
C
Only (III)
D
(I) and (III)
14
MCQ (Single Correct Answer)

Rate law for the reaction $\mathrm{A}+2 \mathrm{~B} \longrightarrow \mathrm{C}$ is found to be

$$\text { Rate }=k[A][B]$$

Concentration of reactant ' B ' is doubled, keeping the concentration of ' A ' constant, the value of rate constant will be ............... .

A
the same
B
doubled
C
quadrupled
D
halved
15
MCQ (Single Correct Answer)

Which of the following statements is incorrect about the collision theory of chemical reaction?

A
It considers reacting molecules or atoms to be hard spheres and ignores their structural features
B
Number of effective collisions determines the rate of reaction
C
Collision of atoms or molecules possessing sufficient threshold energy results into the product formation
D
Molecules should collide with sufficient threshold energy and proper orientation for the collision to be effective
16
MCQ (Single Correct Answer)

A first order reaction is $50 \%$ completed in $1.26 \times 10^{14} \mathrm{~s}$. How much time would it take for $100 \%$ completion?

A
$1.26 \times 10^{15} \mathrm{~s}$
B
$2.52 \times 10^{14} \mathrm{~s}$
C
$2.52 \times 10^{28} \mathrm{~s}$
D
Infinite
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