Assertion: Atoms can neither be created nor destroyed.
Reason: Under similar condition of temperature and pressure, equal volume of gases does not contain equal number of atoms.

Options

A. If both the assertion and reason are true and reason is correct explanation of the assertion .
B. If both the assertion and reason are true but reason is not a correct explanation of the assertion .
C. If the assertion is true but the reason is false.
D. If both assertion and reason are false.

Explanation

To solve the assertion and reason question, we will analyze both statements step by step.

### Step 1: Analyze the Assertion
The assertion states: "Atoms can neither be created nor destroyed."

- This statement is true and is based on Dalton's atomic theory. According to this theory, during a chemical reaction, atoms are rearranged but not created or destroyed.

### Step 2: Analyze the Reason
The reason states: "Under similar conditions of temperature and pressure, equal volume of gases does not contain equal number of atoms."

- This statement is false. According to the ideal gas law (PV = nRT), at constant temperature and pressure, equal volumes of gases contain an equal number of moles of gas. Since one mole of any gas contains the same number of particles (Avogadro's number), it follows that equal volumes of gases at the same temperature and pressure will contain equal numbers of atoms, provided the gases are monoatomic.

### Step 3: Conclusion
- The assertion is true, while the reason is false. Therefore, the correct answer to the question is that the assertion is true but the reason is false.

### Final Answer:
The correct option is C: The assertion is true, but the reason is false.

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