Assetion (A): 1 Avogram is equal to 1 amu.
Reason (R ): Avogram is reciprocal of Avogadro's

Options

A. If both (A) and (R ) are correct and (R ) is the correct explantion for (A)
B. If both (A) and (R ) are correct but (R ) is not the correct explantion for (A)
C. If (A) is correct but (R ) is incorrect.
D. If (A) and (R ) are incorrect.

Explanation

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

### Step 1: Understanding Assertion (A)
**Assertion (A): 1 Avogram is equal to 1 amu.**

- An Avogram is a unit of mass that is defined as the mass of 1 mole of a substance divided by Avogadro's number (approximately \(6.022 \times 10^{23}\)).
- An atomic mass unit (amu) is defined as one twelfth of the mass of a carbon-12 atom.
- By definition, 1 Avogram is equivalent to 1 gram divided by Avogadro's number, which is also equal to 1 amu.

**Conclusion for Assertion (A):** The assertion is **correct**.

### Step 2: Understanding Reason (R)
**Reason (R): Avogram is the reciprocal of Avogadro's number.**

- The statement claims that an Avogram is the reciprocal of Avogadro's number. However, this is incorrect.
- Avogadro's number is a constant that represents the number of particles (atoms, molecules, etc.) in one mole of a substance. It does not have a reciprocal in the context of mass units.
- The Avogram is a unit of mass, while Avogadro's number is a dimensionless quantity that counts entities. They are not directly related as reciprocal quantities.

**Conclusion for Reason (R):** The reason is **incorrect**.

### Final Conclusion
- Since the assertion is correct and the reason is incorrect, we conclude that the correct option is that Assertion (A) is true, and Reason (R) is false.

### Final Answer:
Assertion (A) is correct, but Reason (R) is incorrect.

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