Assertion:Absolute values of intenal energy of substances cannot be determined.
Reason:It is impossible to determine exact values of constituent energies of the substances.

Options

A. If both the assertion and reason are true and reason is correct explanation of the assertion .
B. If both the assertion and reason are true but reason is not a correct explanation of the assertion .
C. If the assertion is true but the reason is false.
D. If both assertion and reason are false.

Answer

A

Explanation

Internal energy is given by : `E=E_("translational")+E_("rotational")+E_("vibrational")+E_("bonding")+E_("electronic")`
Accurate measurements of some forms of energy which contribute to the absolute value of internal energy for a given substance in a given state is impossible. So difference of the initial state and final state is calculated and is denoted by
`DeltaE=E_(f)-E_(i)`