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5
MCQ (Single Correct Answer)

Consider a first order gas phase decomposition reaction given below

$$A(g) \rightarrow B(g)+C(g)$$

The initial pressure of the system before decomposition of $A$ was $p_i$. After lapse of time ' t ' total pressure of the system increased by x units and became ' $\mathrm{p}_{\mathrm{t}}$ '. The rate constant k for the reaction is given as ........... .

A
$k=\frac{2.303}{t} \log \frac{p_i}{p_i-x}$
B
$k=\frac{2.303}{t} \log \frac{p_i}{2 p_i-p_t}$
C
$k=\frac{2.303}{t} \log \frac{p_i}{2 p_i+p_t}$
D
$k=\frac{2.303}{t} \log \frac{p_i}{p_i+x}$
6
MCQ (Single Correct Answer)

According to Arrhenius equation rate constant k is equal to $\mathrm{A} \mathrm{e}^{-\mathrm{E}_{\mathrm{a}} / R T}$ Which of the following options represents the graph of $\ln k$ vs $\frac{1}{\mathrm{~T}}$ ?

A
B
C
D
7
MCQ (Single Correct Answer)

Consider the Arrhenius equation given below and mark the correct option.

$$k=A e^{-\frac{E_a}{R T}}$$

A
Rate constant increases exponentially with increasing activation energy and decreasing temperature
B
Rate constant decreases exponentially with increasing activation energy and decreasing temperature
C
Rate constant increases exponentially with decreasing activation energy and decreasing temperature
D
Rate constant increases exponentially with decreasing activation energy and increasing temperature
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
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