Which of the following would decrease the rate of a chemical reaction?

Using a positive catalyst for the chemical reaction.

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Increasing the concentration of the reactants.

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Increasing the temperature of the reactants.

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Decreasing the surface area of the reactants.

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Solution

The correct option is D
Decreasing the surface area of the reactants.

A chemical reaction takes place when particles of reactant collide with each other forming a product. When the surface area of reactants is more the sites available for the collisions increase. More collisions between the reactants increases the rate of a chemical reaction. Decreasing the surface area of reactants decreases available site for collision. This eventually decreases the rate of a chemical reaction.

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Which of the following statements is correct ?
(a) The rate of reaction decreases with passage of time as the concentration of reactants decreases
(b) The rate of reaction is same at any time during the reaction
(c) The rate of a reaction is independent of temperature change
(d) The rate of a reaction decreases with increase in concentration of reactant (s)

Every chemical reaction has its own characteristic rate. It is affected by some important factors. The most important factors are 1 , temperature, 2 , 3 and surface area out of these factors rise/decrease in temperature, light quantity, rise in the concentration of reactants and surface area 4 the rate of reaction. Whereas as 5 alter the rate of reaction.

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