Element A: Both melting point and boiling point are below
room temperature therefore the element will be gas at room
temperature.
Element B: Both melting point and boiling
point are below room temperature therefore the element will be gas at room
temperature.
Element C: Melting point is below room
temperature and boiling point is above room temperature. Therefore the element will be
liquid at room temperature.
When element C is cooled from
80 degrees C to -10 degrees C, the particles of the element will remain in gas form when
cooled from 80 degrees C to 58 degrees centigrade. When cooled further the particles
will five out latent heat of boiling and turn into solid without temperature drop. When
cooled further after becoming liquid, the particle will remain liquid up to temperature
of -7 degrees C. On being cooled further they will give out latent heat of fusion and
become solid without drop in temperature. On further cooling after conversion to solid
the temperature will again start dropping. The particles will remain in solid state on
reaching the temperature of - 10 degrees C.
Element D:
Melting point is below room temperature and boiling point is above room temperature.
Therefore the element will be liquid at room
temperature.
Element E: Both melting point and boiling
point are above room temperature therefore the element will be solid at room
temperature.
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