Question

Among them Intensive property is:
A.Mass
B.Volume
C.Surface Tension
D.Enthalpy

Answer 1

Hint: Write down the formula used for calculating these properties. Start by examining the terms in the formula and check whether they are dependent on the mass of the sample taken. Intensive properties are independent of the amount of samples taken.

Complete step by step answer:
Intensive properties are those physical properties of a system which can be used to define a system but these properties do not change as the number of moles in the system changes.
  $n(number\,of\,moles) = \dfrac{{Given{\kern 1pt} \,mass}}{{Molar\,mass}}$

$\therefore $ There is a direct relationship between the mass of the system taken and the number of moles. Hence, we can say that Intensive properties are those physical properties which do not change as the mass of the system changes.

For example; Surface Tension is an intensive property because this property arises due to forces of attraction in the molecule which resist its flow. The value of this force does not change with the number of moles in the system.
Other examples include; Melting point, Boiling point.
Extensive properties are those Physical properties which can be used to define a system but they change with the number of moles in the system.
For example; The Mass of a system is dependent upon the mass of the sample taken and hence it is an extensive property.
Volume of a system is also an extensive property. This is because the amount of space occupied by a system is directly dependent on the amount of samples taken. If more samples are used then the amount of volume occupied will also be large.
Energy of the system is also an extensive property, since if we consider the enthalpy of a gas, it will be doubled if the number of moles of the gas is doubled.
Hence the correct answer is option C.

Note:
 Intensive properties will not change with the change in amount of mass taken but they are dependent on other characteristics such as the internal properties of the system like intermolecular forces of attraction.