Law of constant composition doesnot hold good for

Options

A. Endothermic compounds
B. exothermic compounds
C. stoichiometric compounds
D. non-stoichiometric compounds

Explanation

To solve the question regarding the law of constant composition, we need to understand what this law entails and which types of compounds it applies to. Let's break it down step by step.

### Step-by-Step Solution:

1. **Understand the Law of Constant Composition**:
- The law states that a chemical compound always contains its constituent elements in fixed ratio by mass, regardless of how the compound was formed. For example, in carbon dioxide (CO2), the ratio of carbon to oxygen is always 3:8 by mass.

2. **Identify the Types of Compounds**:
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