A : When borax is strongly heated it forms transparent glassy bead .
R : Borax is the other name for sodium tetraborate decahydrate.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion , then mark (1)
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion , then mark (2)
C. If Assertion is true statement but Reason is false , then mark (3)
D. If both Assertion and Reason are false statements , then mark (4)

Answer

To analyze the given statements regarding borax, we will break down the assertion and the reason step by step.

### Step 1: Understanding the Assertion
The assertion states that "when borax is strongly heated, it forms a transparent glassy bead."

- **Explanation**: Borax, chemically known as sodium tetraborate decahydrate (Na2B4O7·10H2O), contains water molecules in its structure. When heated, these water molecules are released, leading to a transformation of the solid into a glassy state. The process involves the melting of the borax, which results in the formation of a transparent, glass-like bead.

### Step 2: Understanding the Reason
The reason states that "Borax is the other name for sodium tetraborate decahydrate."

- **Explanation**: Borax is indeed the common name for sodium tetraborate decahydrate. Its chemical formula is Na2B4O7·10H2O, which indicates that it consists of two sodium (Na) ions, four boron (B) atoms, and seven oxygen (O) atoms, along with ten water (H2O) molecules.

### Step 3: Evaluating the Relationship Between Assertion and Reason
Now, we need to determine if the reason provided is the correct explanation for the assertion.

- **Analysis**: While both statements are true, the reason does not directly explain the assertion. The assertion is about the physical change that occurs when borax is heated, while the reason simply identifies what borax is. Therefore, the reason does not provide a causal link to the assertion.

### Conclusion
Both the assertion and the reason are true, but the reason is not the correct explanation for the assertion.

### Final Answer
- Both A and R are true, but R is not the correct explanation of A.

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