MCQ
Which of the following has maximum melting point
- A

- ✓

- C

- D






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| Column I | Column II |
| A. 3d-transition series | 1. Cerium (Z = 58) |
| B. 4d-transition series | 2. Actinium (Z = 89) |
| C. 4f-inner transition series | 3. Zinc (Z = 30) |
| D. 5f-inner transition | 4.Yttrium (Z = 39) |


$1.$ Boron is approximately $sp^3$ hybridized
$2.$ $B-H-B$ angle is $180^o$
$3.$ There are two terminal $B-H$ bonds for each boron atom
$4.$ There are only $12$ bonding electrons available
Of these statements