Consider the following statements for diborane:
1. Boron is approximately sp3 hybridized
2. B—H—B angle is 180°
3. There are two terminal B—H bonds for each boron atom
4. There are only 12

Question

Consider the following statements for diborane:
1. Boron is approximately sp3 hybridized
2. B—H—B angle is 180°
3. There are two terminal B—H bonds for each boron atom
4. There are only 12 bonding electrons available
Of these statements:

Prashant Kotian · Accepted Answer

Correct answer: A. Step 1: Alumina (Al2O3) is a highly stable ionic compound. Step 2: Due to the high charges (+3 on Al and -2 on O) and small ionic radii of both the aluminum and oxide ions, the electrostatic forces of attraction in the crystal lattice are extremely strong. Step 3: This results in an exceptionally high lattice energy that cannot be overcome by the hydration energy of the ions (low heat of hydration), making alumina insoluble in water (option b).

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