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A solid reactant is in the shape of a cube having side equal to 3 cm. The observed rate of reaction is \mathrm{R_1}.

If the cube is divided into smaller cubes having size 1 cm then the observed rate of reaction is \mathrm{R_2}.

If the cube is divided into smaller cubes having size 1.5 cm, then the observed rate of reaction is \mathrm{R_3}.

Which of the following correctly represents the relation between \mathrm{R_1, R_2\ and\ R_3}?

Option: 1

\mathrm{R_1 > R_2 > R_3}


Option: 2

\mathrm{R_2 > R_1 > R_3}


Option: 3

\mathrm{R_2 > R_3 > R_1}


Option: 4

\mathrm{R_1 = R_2 = R_3}


Answers (1)

In general, greater the surface area, greater is the rate of reaction 

The total surface area will be greatest for the second case in which smaller cubes have size 1 cm followed by the third case in which the smaller cubes have size 1.5 cm

Hence, the correct order of rate of reactions is \mathrm{R_2 > R_3 > R_1}

Thus, the correct answer is Option (3)

Posted by

Sumit Saini

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