Which of the following is not true for a compound?

Options

A. Compound contains different elements in a fixed ratio.
B. It is heterogeneous in nature.
C. Properties of a compound are entirely different from those of the elements present in it.
D. Constituents of a compound cannot be separated by simple physical methods.

Explanation

To determine which of the following statements is not true for a compound, we need to analyze the characteristics of compounds. Here’s a step-by-step breakdown:

### Step 1: Define a Compound
A compound is a substance formed when two or more different types of atoms bond together chemically. For example, water (H2O) is a compound made of hydrogen and oxygen atoms.

**Hint:** Remember that compounds consist of different elements bonded together in fixed ratios.

### Step 2: Fixed Ratios of Elements
In a compound, the elements are present in fixed ratios. For instance, in water (H2O), there are always two hydrogen atoms for every one oxygen atom. This fixed ratio is a defining characteristic of compounds.

**Hint:** Think about how the composition of a compound remains constant regardless of the amount you have.

### Step 3: Homogeneous Nature
Compounds are homogeneous in nature. This means that they have a uniform composition throughout. For example, if you take a sample of water, it will always have the same ratio of hydrogen to oxygen, making it uniform.

**Hint:** Consider how mixtures differ from compounds in terms of composition uniformity.

### Step 4: Properties of Compounds
The properties of a compound are often very different from the properties of the individual elements that make it up. For example, hydrogen is a flammable gas, and oxygen supports combustion, but water is a liquid that extinguishes fire.

**Hint:** Reflect on how the combination of elements can lead to new properties that are not present in the individual elements.

### Step 5: Separation of Components
The elements in a compound cannot be separated by physical means; they require chemical reactions to break the bonds between them. For instance, to separate hydrogen and oxygen from water, you would need to perform electrolysis, which is a chemical process.

**Hint:** Consider the difference between physical changes (like dissolving) and chemical changes (like reactions).

### Conclusion
Based on the analysis above, the statement that is **not true** for a compound is that "the compound is heterogeneous in nature." Compounds are homogeneous, not heterogeneous.

### Final Answer
The statement that is not true for a compound is: "The compound is heterogeneous in nature."

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