1
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 9th January Evening Slot

For the reaction, 2A + B $$ \to $$ products, when the concentrations of A and B both were doubled, the rate of the reaction increased from 0.3 mol L$$-$$1s$$-$$1 to 2.4 mol L$$-$$1s$$-$$1. When the concentration of A alone is doubled, the rate increased from 0.3 mol L$$-$$1s$$-$$1 to 0.6 mol L$$-$$1s$$-$$1.
A
Total order of the reaction is 4
B
Order of the reaction with respect to B is 2
C
Order of the reaction with respect to B is 1
D
Order of the reaction with respect to A is 2

Explanation

$$r = K{\left[ A \right]^x}{\left[ B \right]^y}$$

$$ \Rightarrow 8 = {2^3} = {2^{x + y}}$$

$$ \Rightarrow x + y = 3\,...(1)$$

$$ \Rightarrow 2 = {2^x}$$

$$ \Rightarrow x = 1,y = 2$$

Order w.r.t. A = 1

Order w.r.t. B = 2
2
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 9th January Evening Slot

Consider the following reversible chemical reactions :



The relation between K1 and K2 is :
A
K1K2 = $${1 \over 3}$$
B
K2 = K13
C
K2 = K1$$-$$3
D
K1K2 = 3

Explanation

3
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 10th January Morning Slot

Which of the graphs shown below does not represent the relationship between incident light and the electron ejected from metal surface ?
A
B
C
D

Explanation

E = W + $${1 \over 2}$$mv2

K.E. = hv $$-$$ 4v0

K.E. = hv + ($$-$$ hv0)

y = mx + $$\underline C $$
4
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 10th January Morning Slot

Consider the given plots for a reaction obeying Arrhenius equation (0oC < T < 300oC) : (K and Ea are rate constant and activation energy, respectively)



Choose the correct option :
A
I is right but II is wrong
B
Both I and II are correct
C
Both I and II are wrong
D
I is wrong but II is right

Explanation

Arrhenius Equation -

Arrhenius gave the quantitative dependence of rate constant on temperature by the Arrhenius equation.

- wherein

$$k = A{e^{ - {E_a}/RT}}$$

$${\mathop{\rm lnk}\nolimits} = lnA - {{{E_a}} \over {RT}}$$

k = Rate constant

as we have learned in Arrhenius equation when we increase Ea, K should decrease As T increases, power of exponential increases so k also increase.

Hence, both the plots are correct.

Questions Asked from Chemical Kinetics and Nuclear Chemistry

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