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Question

In which of the following case the rate of the reaction will be more?

A
Marble chip reacting with dilute HCl.
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B
Marble powder reacting with dilute HCl.
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C
Marble stone reacting with dilute HCl.
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D
Marble piece reacting with dilute HCl.
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Solution

The correct option is B Marble powder reacting with dilute HCl.
There are many factors which affect the rate of a reaction. The surface area of solids is one such factor which affects the rate of the reaction.
The rate of reaction increases if the exposed surface area of the reactant is more.
When we use the powdered form of reactants in place of a stone, piece or chip of reactants, the rate of reaction increases as the surface area exposed is more.
Therefore, the rate of the reaction will be more in the case of marble powder reacting with dilute HCl.

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