8
MCQ (Single Correct Answer)
A graph of volume of hydrogen released vs time for the reaction between zinc and dil. HCl is given in figure. On the basis of this mark the correct option.
A
Average rate upto 40 s is $\frac{V_3-V_2}{40}$
B
Average rate upto 40 s is $\frac{V_3-V_2}{40-30}$
C
Average rate upto 40 s is $\frac{V_3}{40}$
D
Average rate upto 40 s is $\frac{V_3-V_1}{40-20}$
9
MCQ (Single Correct Answer)
Which of the following statements is not correct about order of a reaction?
A
The order of a reaction can be a fractional number
B
Order of a reaction is experimentally determined quantity
C
The order of a reaction is always equal to the sum of the stoichiometric coefficients of reactants in the balanced chemical equation for a reaction
D
The order of a reaction is the sum of the powers of molar concentration of the reactants in the rate law expression
10
MCQ (Single Correct Answer)
Consider the graph given in figure. Which of the following options does not show instantaneous rate of reaction at 40s?
A
$\frac{V_5-V_2}{50-30}$
B
$\frac{V_4-V_2}{50-30}$
C
$\frac{V_3-V_2}{40-30}$
D
$\frac{V_3-V_1}{40-20}$
11
MCQ (Single Correct Answer)
Which of the following statements is correct?
A
The rate of a reaction decreases with passage of time as the concentration of reactants decreases
B
The rate of a reaction is same at any time during the reaction
C
The rate of a reaction is independent of temperature change
D
The rate of a reaction decreases with increase in concentration of reactant (s)
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
$\frac{\Delta\left[\mathrm{Br}^{-}\right]}{\Delta t}=6 \frac{\Delta\left[\mathrm{H}^{+}\right]}{\Delta t}$