Which of the following reactions of marble with \(100 cm ^{3}\) of \(0.100\) moldm\(^{3}\). HCl is fastest?
A. \(5 g\) of marble lump at \(50^{\circ} C\) B. \(5 g\) of marble powder at \(50^{\circ} C \quad\) C. \(5 g\) of marble powder at \(25^{\circ} C\) D. \(5 g\) of marble lump at \(25^{\circ} C\)
Correct Answer: B
Explanation
A larger surface area (presented by the powder) allow for larger no of collision making the reaction fast. Also, increasing the temperature of the system increase the rate of the reaction. Thus, \(5 g\) of marble powder at \(50^{\circ} C\) reacts fastest with the given \(HCl\).