Matter in Our S...

What is the value of latent heat of fusion for ice?

A liquid kept in an open vessel undergoes evaporation. The particles of liquid absorb energy from surroundings to regain the energy lost during evaporation. This absorption of energy from the surroundings results in

(i) an increase in the temperature of the surroundings
(ii) a decrease in the temperature of the surroundings
(iii) no change in the temperature of the surroundings
(iv) an increase/a decrease in the temperature of the surroundings depending upon the nature of the liquid

Which of the above points is/are is correct?

In which of the following cases is the rate of cooking very slow?

(A) Assertion: Ice in a perfectly insulated thermos flask will melt when brought from hills to the plains.
(R) Reason: The freezing point is lower at sea level than at higher altitudes.

Substances that sublime

The working of a syringe is based on

Which sample at S.T.P. has same number of molecules as 5 L of NO₂ (g) has at S.T.P?

Which of the following substances is known as 'dry ice'?

The fixed temperature at which the solid and liquid states of a substance exist in equilibrium under 1 atm pressure is called