which of the following reations are examples for heterogeneous catalysis ?

Options

A. The energy of activation does not change
B. The catalyst combines with the reactant to form a compound
C. The reactant molecules are adsorbed on the surface of the catalyst
D. The catalyst lowers the energy of activation

Explanation

To determine which of the given reactions are examples of heterogeneous catalysis, we need to understand the definition of heterogeneous catalysis. Heterogeneous catalysis occurs when the reactants and the catalyst are in different phases (states of matter). Here’s a step-by-step analysis of the options provided:

### Step 1: Understand Heterogeneous Catalysis
- Heterogeneous catalysis involves a catalyst that is in a different phase than the reactants. For instance, if the catalyst is solid and the reactants are gases or liquids, it is classified as heterogeneous catalysis.

### Step 2: Analyze Each Option
1. **Option A: H2O2 (liquid) + MnO2 (solid)**
- Here, H2O2 is in the liquid phase, and MnO2 is in the solid phase. Since they are in different phases, this is an example of heterogeneous catalysis.
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