Question

On increasing the temperature of solids. Kinetic energy of the particle increases.
Due to increase in kinetic energy the particles start vibrating with greater speed. A
stage is reached when the solid melts and is converted to a liquid. When the solid
melts, its temperature remain the same.

i) The minimum temperature at which a solid melt to become a liquid at the
atmospheric pressure is called
a) Boiling point
b) Melting point
c) Curie temperature
d) None of these

ii) When the liquid changes to vapour, its temperature remains same. This is
due to
a) Latent heat of fusion
b) Latent heat of condensation
c) Latent heat of vaporization
d) None of these

iii) 527 K temperature is equal to
a) 251°C
b) 252°C
c) 253°C
d) 254°C

iv) What is the unit of latent heat of fusion?
a) J g-¹
b) J Kg-¹
c) KJ Kg-¹
d) KJ g-¹​

Answer 1

Answer:

Explanation:

(i) The temperature at which solid melts to become a liquid at the atmospheric pressure is called its melting point

(ii) The temperature remains constant during boiling of water even though heat is supplied constantly because all the heat energy provided is used up in changing the state of water from liquid to gaseous water vapor.

(iii) 253.85

Formula- 527K − 273.15 = 253.85°C

(iv) SI unit of Latent Heat of Fusion is J/kg.