Question:
Choose the wrong statement in the following with regard to orthoboric acid:
Choose the wrong statement in the following with regard to orthoboric acid:
Updated On: Apr 4, 2025
- It can be prepared by the hydrolysis of boron trihalide
It is freely soluble in cold water
- It has a layer structure
It is not a protonic acid but acts as a Lewis acid
- On heating above 370K it forms first metaboric acid which on further heating yields $B_2O_3$
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The Correct Option is B
Solution and Explanation
Let's evaluate each statement about orthoboric acid (H₃BO₃):
- It can be prepared by the hydrolysis of boron trihalide: This statement is correct. Orthoboric acid can be prepared by hydrolyzing boron trihalide (such as BCl₃) in water.
- It is not a protonic acid but acts as a Lewis acid: This statement is correct. While orthoboric acid doesn't behave as a typical protonic acid, it acts as a Lewis acid by accepting electron pairs.
- It has a layer structure: This statement is correct. Orthoboric acid has a layered structure in its solid state, where each boron atom is connected to three hydroxyl groups.
- It is freely soluble in cold water: This statement is incorrect. Orthoboric acid is only sparingly soluble in cold water, not freely soluble.
- On heating above 370K it forms first metaboric acid which on further heating yields B₂O₃: This statement is correct. Orthoboric acid undergoes dehydration upon heating to form metaboric acid, which can further dehydrate to form boron oxide (B₂O₃).
Correct Answer: (B) It is freely soluble in cold water
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