1.

Study the diagram below showing the arrangement of particles of a substance at temperatures 20°C and 40°C. What in youropinion would be the melting and boiling points of the substance?​

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Answer:

Boiling POINT is come from solid to liquid TRANSITION and FREEZING point is come from liquid to solid transition of a material. Generally, the freezing point is same as the boiling point. Thus,  from the diagram, the substance B has freezing point or boiling point at 40  o

C and the temperature range 60  o

C to 160  o

C at which the SUBSTANCES B and D can co-exit in liquid STATE



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