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An increase in the concentration of the reactants of a reaction leads to change in :
  • a)
    threshold energy
  • b)
    collision frequency
  • c)
    activation energy
  • d)
    heat of reaction
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
An increase in the concentration of the reactants of a reaction leads ...
Collision frequency, as number of molecules per unit volume increases.
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An increase in the concentration of the reactants of a reaction leads ...
Increase in concentration of reactants and its effect on collision frequency

When the concentration of reactants in a chemical reaction is increased, it means that there are more particles of reactants per unit volume of the reaction mixture. This increase in concentration of reactants has the following effects:

1. Increase in collision frequency

As the concentration of reactants increases, the frequency of collisions between the reactant particles also increases. This is because the reactant particles are now closer to each other and hence collide more frequently. This increase in collision frequency leads to an increase in the rate of the reaction.

2. No effect on threshold energy

The threshold energy of a reaction is the minimum amount of energy required for a chemical reaction to occur. Increasing the concentration of reactants does not change the threshold energy of a reaction.

3. No effect on activation energy

The activation energy of a reaction is the energy required for the reactant particles to overcome the energy barrier and react. Increasing the concentration of reactants does not change the activation energy of a reaction.

4. No effect on heat of reaction

The heat of reaction is the amount of heat released or absorbed during a chemical reaction. Increasing the concentration of reactants does not change the heat of reaction of a reaction.

Therefore, the correct answer is option B, i.e., an increase in the concentration of the reactants of a reaction leads to a change in collision frequency.
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Community Answer
An increase in the concentration of the reactants of a reaction leads ...
Collision frequency ∝ no. of reacting molecules or atoms

Higher the concentration of reactant molecules higher is the probability of collision and so the collision frequency. 


Option B is correct.
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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: Rate of reaction is a measure of change in concentration of reactant with respect to time.Reason: Rate of reaction is a measure of change in concentration of product with respect to time.

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An increase in the concentration of the reactants of a reaction leads to change in :a)threshold energyb)collision frequencyc)activation energyd)heat of reactionCorrect answer is option 'B'. Can you explain this answer?
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