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| 1. |
.Which of the alkali metal is having least melting point?A. `Na`B. `K`C. `Rb`D. `Cs` |
| Answer» d. As the size of the metal increases, the strength of metallic bonding decreases and hence its melting point decreases. Since the size of `Cs` is the largest, therefore, its melting point is the lowest. Thus, option (d) is correct. | |