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Assertion (A): Mixture of liquid air and air cannot be considered as pure substance.                                

Reason (R): Proportions of oxygen and nitrogen differ in liquid and gaseous states in equilibrium.

a) Both A and R are individually true and R is the correct explanation of A

b) Both A and R are individually true but R is not the correct explanation of A

c) A is true but R is false

d) A is false but R is true

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