Question

Statement (I): A mixture of liquid air and air cannot be considered as pure substance.

Statement: (II): Proportions of oxygen and nitrogen differ in liquids and gaseous states in equilibrium.
1. Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)
2. Both Statement (I) and Statement (II) are individually true and Statement (II) is NOT the correct explanation of Statement (I)
3. Statement (I) is true but Statement (II) false
4. Statement (I) is false but Statement (II) is true 

Answer 1

Correct Answer - Option 1 : Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)

Pure Substance: A substance is called pure substance if it has a homogenous chemical composition throughout. Water, oxygen, nitrogen, for example, are all pure substances.

A mixture of two or more chemical elements or compounds is also the pure substance as long as their composition is homogenous. A mixture of two or more phases can also be pure substance provided their composition is homogenous.

A mixture of liquid air and air cannot be considered as pure substance because the percentage composition of oxygen and nitrogen differ in liquids and gaseous states in equilibrium.

So, both the statement is correct and statement 2 is the correct explanation of statement 1.