rate of the reaction mc

The answer is : A.using 100 cm³ of HCl(aq) instead of 50 cm³ of HCl(aq)

The main concept in options A, B and C is that concentration is a factoraffecting the initial rate, but not the volume of the solution (providing allsolid reactant(s) is/are immersed in the solution). A higher concentration means that there is agreater number of reactant particles in each unit volume of the solution, andthis will cause more frequent collisions between the reactant particles leadingto a faster rate. However, in case of differentvolumes of solution of the same concentration, there are equal numbers ofreactant particles in each unit volume of the two solutions.

A. The initial rate is the same as the solutions used are of the sameconcentration, although their volumes are different.

B. The initial rate is increased as HCl used is in higher concentration.

C. The initial rate is increased as HCl used is in higher concentration, despitesmaller volume.

D. The initial rate is increased as the surface area of the solid reactant isincreased.