Question

Identify correctly matched pairs: \[ \text{I. Borax} \quad \text{Na}_2\text{B}_4\text{O}_7 \cdot 10\text{H}_2\text{O} \quad \text{II. Kernite} \quad \text{Na}_2\text{B}_4\text{O}_7 \cdot 7\text{H}_2\text{O} \] \[ \text{III. Bauxite} \quad \text{Al}_2\text{O}_3 \cdot \text{H}_2\text{O} \quad \text{IV. Cryolite} \quad \text{Na}_3\text{AlF}_6 \]

• A. I, III only
• B. II, IV only
• C. II, III only
• D. I, IV only

Hint:

Borax and Kernite are both important boron minerals, and Bauxite is an ore of aluminum, while Cryolite is used in aluminum extraction.

Answer 1

The Correct Option is A

- Borax is correctly matched with \(\text{Na}_2\text{B}_4\text{O}_7 \cdot 10\text{H}_2\text{O}\) (Option I). - Kernite is correctly matched with \(\text{Na}_2\text{B}_4\text{O}_7 \cdot 7\text{H}_2\text{O}\), so Option II is correct. - Bauxite is correctly matched with \(\text{Al}_2\text{O}_3 \cdot \text{H}_2\text{O}\), making Option III correct. - Cryolite is correctly matched with \(\text{Na}_3\text{AlF}_6\), which is Option IV.
Therefore, the correct answer is option (1), which corresponds to pairs I and III.