The correct expression for the rate of reaction given below is:
\(5 \mathrm{Br}^{-}(\mathrm{aq})+\mathrm{BrO}_3^{-}(\mathrm{aq})+6 \mathrm{H}^{+}(\mathrm{aq}) \rightarrow 3 \mathrm{Br}_2(\mathrm{aq})+3 \mathrm{H}_2 \mathrm{O}(\mathrm{l})\)

1. \(\frac{\Delta\left[B r^{-}\right]}{\Delta t}=5 \frac{\Delta\left[H^{+}\right]}{\Delta t} \) 2. \(\frac{\Delta\left[\mathrm{Br}^{-}\right]}{\Delta t}=\frac{6}{5} \frac{\Delta\left[\mathrm{H}^{+}\right]}{\Delta t} \)
3. \(\frac{\Delta[\mathrm{Br^-}]}{\Delta t}=\frac{5}{6} \frac{\Delta\left[\mathrm{H}^{+}\right]}{\Delta t} \) 4. \(\frac{\Delta\left[\mathrm{Br}^{-}\right]}{\Delta t}=6 \frac{\Delta\left[\mathrm{H}^{+}\right]}{\Delta t}\)

Subtopic:  Definition, Rate Constant, Rate Law |
 87%
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The correct representation of an exothermic reaction is:

1.  2.
3. 4. Both 1 and 2
Subtopic:  Arrhenius Equation |
 85%
From NCERT
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Rate law for the reaction \(A+2 B \rightarrow C\) is found to be
Rate = k[A][B]
If the concentration of reactant 'B' is doubled, keeping the concentration of A constant, then the value of the rate of the reaction will  be:

1. The same. 2. Doubled.
3. Quadrupled. 4. Halved.

Subtopic:  Definition, Rate Constant, Rate Law |
 76%
From NCERT
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An incorrect statement about the collision theory of chemical reaction is:

1. It considers reacting molecules or atoms to be hard spheres and ignores their structural features.
2. The number of effective collisions determines the rate of reaction.
3. The collision of atoms or molecules possessing sufficient threshold energy results in product formation.
4. Molecules should collide in the proper orientation for the collision to be effective with sufficient threshold energy and proper orientation.
Subtopic:  Arrhenius Equation |
From NCERT
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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

Subtopic:  First Order Reaction Kinetics |
 72%
From NCERT
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An incorrect statement regarding the catalyst is:

1. It catalyzes the forward and backward reactions to the same extent.
2. It alters gibbs free energy of the reaction.
3. It is a substance that does not change the equilibrium constant of a reaction.
4. It provides an alternate mechanism by reducing activation energy between reactants and products.
Subtopic:  Catalyst |
 78%
From NCERT
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Consider the reaction AB. 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.
Subtopic:  Definition, Rate Constant, Rate Law |
 82%
From NCERT
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The correct graphical representation of first-order reaction is:

(a)  (b)
(c) (d)


 

1. (a) and (b) 2. (b) and (c)
3. (c) and (d) 4. (a) and (d)
Subtopic:  First Order Reaction Kinetics |
 81%
From NCERT
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Match the graph given in Column I with the order of reaction given in Column II.
More than one item in Column I may be linked to the same item in Column II:

Column I Column II
(a) (a) 1st order
(b) (b) Zero order
(c)
(d)
 
 
(i) (ii) (iii) (iv)
1. (a) (b) (a) (b)
2. (a) (b) (b) (a)
3. (a) (a) (b) (b)
4. (b) (b) (a) (a)
Subtopic:  Order, Molecularity and Mechanism |
 72%
From NCERT
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Match the statements in Column I and Column II :
Column I Column II
A. Catalyst alters the rate of reaction  1.  Proper orientation is not there always 
B.  e-Ea/RT 2. By lowering the activation energy
C.  Energetically favorable reactions are sometimes slow 3. Total probability is one
D. Area under the Maxwell-Boltzmann curve is constant 4. Refers to the fraction of molecules with energy equal to or greater than the activation energy

Codes

A B C D
1. 2 4 1 3
2. 3 1 4 2
3. 1 4 3 2
4. 3 4 1 2
Subtopic:  Catalyst |
 91%
From NCERT
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