Assertion(A ): The enthalpies of elements in their standard states are taken as zero Reason (R ): It is impossible to determine the absolute enthalpy of any substance
A
If both the statements are TRUE and STATEMENT-2 is the correct explanation of STATEMENT-9
B
If both the statements are TRUE but STATEMENT-2 is NOT the correct explanation of STATEMENT-9
C
If STATEMENT-1 is TRUE and STATEMENT-2 is FALSE
D
If STATEMENT-1 is FALSE and STATEMENT-2 is TRUE
Text Solution
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The correct Answer is:
D
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The enthalpies of formation of the elements in their standard states are
The enthalpy of elements in their standard states are taken as zero. Hence the enthalpy of formation of a compound is
Assertion(A ): Absolute values of internal energy cannot be determined Reason (R ): It is impossible to determine the exact values of constituent energies of the substances
For which of the following elements, the standard enthalpy is not zero?
Assertion (A): Internal energy change in a cyclic process is zero Reason (R ): Internal energy is a state function
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