Question

PLEASE HELPPP MEEEE

An unknown substance is cooled from 25 °C to 10 °C. The table below shows the state of the substance at different temperatures.
Time (minutes) Temperature (degrees Celsius) State of matter 0 25 Liquid 2 23 Liquid 4 18 6 18 8 18 10 15 Solid 12 10 Solid

Which statement is correct about the unknown substance?
Its freezing point is 23 °C.
Its freezing point is 18 °C.
The substance sublimes at 23 °C.
The substance exists as a gas at 18 °C.

Answer 1

The second statment is true and right. Hope this helps!!

Answer 2

Answer: Option (b) is the correct answer.

Step-by-step explanation:

Freezing point is defined as the point at which liquid state of a substance changes into solid state.

So, in the given table it is shown that at temperature
`18^(o)C` the substance is changing into solid state. Whereas at
`23^(o)C` the substance is in liquid state.

Hence,
`18^(o)C` will be the freezing point of the substance.

Thus, we can conclude that the statement its freezing point is
`18^(o)C`, is correct about the unknown substance.