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Class 12 Exam  >  Class 12 Questions  >  For which of the following reaction the units... Start Learning for Free
For which of the following reaction the units of rate constant and rate of the reaction are same?
  • a)
    Zero order reaction
  • b)
    Third order reaction
  • c)
    Second order reaction
  • d)
    First order reaction
Correct answer is option 'A'. Can you explain this answer?
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For which of the following reaction the units of rate constant and rat...
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For which of the following reaction the units of rate constant and rat...
If the reaction is zero order, the rate constant has exactly the same units as the rate of the reaction mol L-^1 s -^1. If the reaction is first order, then the concentration of one reactant takes care of the units of concentration, thus the rate constant is simply given in units of reciprocal time, s-^1.
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For which of the following reaction the units of rate constant and rat...
Zero order reaction:
In a zero order reaction, the rate of the reaction is independent of the concentration of the reactants. The rate equation for a zero order reaction is given by:

rate = k

where 'k' is the rate constant. The units of the rate constant for a zero order reaction can be determined by considering the units of the rate.

Units of rate:
The units of rate depend on the stoichiometry of the reaction. For a zero order reaction, the rate is expressed in terms of the change in concentration per unit time, usually in moles per liter per second (mol/L/s).

Units of rate constant:
To determine the units of the rate constant, we can rearrange the rate equation:

rate = k

k = rate

Since the units of rate for a zero order reaction are in mol/L/s, the units of the rate constant will also be in mol/L/s.

Therefore, the rate constant and the rate of the reaction have the same units in a zero order reaction.

Other orders of reactions:
For other orders of reactions, the rate constant and the rate of the reaction do not have the same units.

- In a first order reaction, the rate constant has units of 1/s, while the rate has units of 1/s multiplied by the concentration of the reactant.

- In a second order reaction, the rate constant has units of 1/(mol/L)/s, while the rate has units of 1/s multiplied by the concentration squared.

- In a third order reaction, the rate constant has units of 1/(mol^2/L^2)/s, while the rate has units of 1/s multiplied by the concentration cubed.

Therefore, the correct answer is option 'A' - zero order reaction, where the units of the rate constant and the rate of the reaction are the same.
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Read the passage given below and answer the following questions:The rate of a reaction, which may also be called its velocity or speed, can be defined with relation to the concentration of any of the reacting substances, or to that of any product of the reaction. If the species chosen is a reactant which has a concentration c at time t the rate is - dc/dt, while the rate with reference to a product having a concentration x at time t is dx/dt. Any concentration units may be used for expressing the rate; thus, if moles per liter are employed for concentration and seconds for the time, the units for the rate are moles litre–1sec–1. For gas reactions pressure units are sometimes used in place of concentrations, so that legitimate units for the rate would be (mm. Hg) sec–1 and atm. sec–1 The order of a reaction concerns the dependence of the rate upon the concentrations of reacting substances; thus, if the rate is found experimentally to be proportional to the ath power of the concentration of one of the reactants A, to the both power of the concentration of a second reactant B, and so forth, via., rate = k CAα CAβ the over-all order of the reaction is simply n = α + β + ----- (2) Such a reaction is said to be of the αth order with respect to the substance A, the βth order with respect to B.In the following questions, a statement of Assertion followed by a statement of Reason is given. Choose the correct answer out of the following choices on the basis of the above passage.Assertion: Reactions can occur at different speeds.Reason: Rate of reaction is also called speed of reaction.

Read the passage given below and answer the following questions:The rate of a reaction, which may also be called its velocity or speed, can be defined with relation to the concentration of any of the reacting substances, or to that of any product of the reaction. If the species chosen is a reactant which has a concentration c at time t the rate is - dc/dt, while the rate with reference to a product having a concentration x at time t is dx/dt. Any concentration units may be used for expressing the rate; thus, if moles per liter are employed for concentration and seconds for the time, the units for the rate are moles litre–1sec–1. For gas reactions pressure units are sometimes used in place of concentrations, so that legitimate units for the rate would be (mm. Hg) sec–1 and atm. sec–1 The order of a reaction concerns the dependence of the rate upon the concentrations of reacting substances; thus, if the rate is found experimentally to be proportional to the ath power of the concentration of one of the reactants A, to the both power of the concentration of a second reactant B, and so forth, via., rate = k CAα CAβ the over-all order of the reaction is simply n = α + β + ----- (2) Such a reaction is said to be of the αth order with respect to the substance A, the βth order with respect to B.In the following questions, a statement of Assertion followed by a statement of Reason is given. Choose the correct answer out of the following choices on the basis of the above passage.Assertion: For a reaction: P + 2Q → Products, Rate = k [P]1/2[Q]1 so the order of reaction is 1.5Reason: Order of reaction is the sum of stoichiometric coefficients of the reactants.

For which of the following reaction the units of rate constant and rate of the reaction are same?a)Zero order reactionb)Third order reactionc)Second order reactiond)First order reactionCorrect answer is option 'A'. Can you explain this answer?
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