Question

A substance was analysed and was found to have a boiling point of 450 °C.

At room temperature it is a soft grey solid.
Which temperature could be the melting point of a pure sample of the substance?
А
-12 °C
B
56 °C to 72 °C
с
250 °C to 275 °C
D
142 °C

Answer 1

D: 142 °C

Step-by-step explanation:

In pure substances, melting and boiling points are usually two distinct temperatures.

They are -12°C and 142°C.

We are told that at room temperature, thus substance becomes a soft grey solid. Thus, we can say that the temperature of the melting point is 142°C.