# The correct rate law for the given balanced reaction is :                 $$4A\,+\,2B$$ → $$C \,+\,3D$$ 1. Rate = k[A]4[B]2 2. Rate = k[A]2[B] 3. Rate = k[C][D]3/[A]4[B]2 4. Cannot be determined from the information given.

Subtopic:  Definition, Rate Constant, Rate Law |
From NCERT
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For a reaction $$3A \rightarrow 2B$$
The average rate of appearance of B is given by $$\Delta [B] \over \Delta t$$.
The correct relation between the average rate of appearance of B with the average rate of disappearance of A is:
 1 $$-\Delta [A] \over \Delta t$$ 2 $$-3\Delta [A] \over 2\Delta t$$ 3 $$-2\Delta [A] \over 3\Delta t$$ 4 $$\Delta [A] \over \Delta t$$
Subtopic:  Definition, Rate Constant, Rate Law |
78%
From NCERT
NEET - 2023
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The correct options for the rate law that corresponds to overall first order reaction is:
 1 $$Rate =k[A]^0[B]^2$$ 2 $$Rate =k[A][B]$$ 3 $$Rate=k[A]^{1 / 2}[B]^2$$ 4 $$Rate =k[A]^{-1 / 2}[B]^{3 / 2}$$
Subtopic:  Order, Molecularity and Mechanism |
77%
From NCERT
NEET - 2023
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For a certain reaction, the rate = $$k[A]^2[B],$$ when the initial concentration of A is tripled keeping the concentration of B constant, the initial rate would be:
 1 Increase by a factor of three 2 Decrease by a factor of nine 3 Increase by a factor of six 4 Increase by a factor of nine
Subtopic:  Order, Molecularity and Mechanism |
75%
From NCERT
NEET - 2023
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
 Assertion (A): A reaction can have zero activation energy. Reason (R): The minimum extra amount of energy absorbed by reactant molecules so that their energy becomes equal to threshold value, is called activation energy.
In the light of the above statements choose the correct answer from the options given below:
 1 Both (A) and (R) are True and (R) is the correct explanation of (A). 2 Both (A) and (R) are True but (R) is not the correct explanation of (A). 3 (A) is True but (R) is False. 4 (A) is False but (R) is True.
Subtopic:  Arrhenius Equation |
From NCERT
NEET - 2023
Hints

(P) Number of intermediates = 2
(Q) Number of transition states = 3
(R) Reaction is endothermic.

Correct statement is:

1. P & Q only.
2. P & R only.
3. Q & R only.
4. P, Q, R

Subtopic:  Arrhenius Equation |
69%
From NCERT
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For a chemical reaction, 4A + 3B → 6C + 9D
rate of formation of C is 6 × 10–2 mol L–1 s–1 and rate of disappearance of A is 4 × 10–2 mol L–1 s–1. The rate of reaction and amount of B consumed in interval of 10 seconds, respectively will be:
 1 1 × 10–2 mol L–1 s–1 and 30 × 10–2 mol L–1 2 10 × 10–2 mol L–1 s–1 and 10 × 10–2 mol L–1 3 1 × 10–2 mol L–1 s–1 and 10 × 10–2 mol L–1 4 10 × 10–2 mol L–1 s–1 and 30 × 10–2 mol L–1
Subtopic:  Definition, Rate Constant, Rate Law |
68%
From NCERT
NEET - 2022
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The half-life of a first-order reaction is 2000 years. If the concentration after 8000 years is 0.02 M, then the initial concentration was:
1. 0.16 M
2. 0.32 M
3. 0.08 M
4. 0.04 M
Subtopic:  First Order Reaction Kinetics |
61%
From NCERT
NEET - 2022
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The plot of ln k vs $${1 \over T}$$ for the following reaction
$$2N_2O_5(g) \rightarrow 4NO_2 (g) + O_2(g)$$ gives a straight line with the slope of the line equal to $$-1.0 \times 10^4 K$$.
The activation energy for the reaction in J mol–1 is:
(Given R = 8.3 J K1 mol1)

 1 $$4.0 \times 10^2$$ 2 $$4.0 \times 10^{-2}$$ 3 $$8.3 \times 10^{-4}$$ 4 $$8.3 \times 10^4$$
Subtopic:  Arrhenius Equation |
76%
From NCERT
NEET - 2022
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NEET 2025 - Target Batch
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For the reaction, 2A → B, rates= k[A]2. If the concentration of reactant is doubled, then the:

 (a) rate of reaction will be doubled. (b) rate constant will remain unchanged, however rate of reaction is directly proportional to the rate constant. (c) rate constant will change since the rate of reaction and rate constant are directly proportional to each other. (d) rate of reaction will increase by four times.

Identify the set of correct statements & choose the correct answer from the options given below:

 1 (a) and (c) only 2 (a) and (b) only 3 (b) and (d) only 4 (c) and (d) only
Subtopic:  Definition, Rate Constant, Rate Law |
69%
From NCERT
NEET - 2022
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NEET 2025 - Target Batch
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