SSC MTS EXAM

Detailed explanation-1: -Enzymes (and other catalysts) act by reducing the activation energy, thereby increasing the rate of reaction. The increased rate is the same in both the forward and reverse directions, since both must pass through the same transition state.

Detailed explanation-2: -positive catalysts may either: (1) Reduce the activation energy required for the reactant particles to become an activated complex.

Detailed explanation-3: -A catalyst provides an alternative reaction pathway that has a lower activation energy than the uncatalysed reaction. This does not change the frequency of collisions. However, it does increase the frequency of successful collisions because a greater proportion of collisions now exceeds this lower activation energy.

Detailed explanation-4: -A catalyst which increases the rate of reaction is called positive catalyst.