Assertion :Statement-I : The standard free energy changes of all sponatneously occuring reactions are negative.
Because Reason: Statement-II: The standard free energies of the elements in their standard states at $1 b a r$ and $298 K$
are taken as zero.

Read the above statements and choose the correct option regarding it.

Statement-I is true, Statement-II is true ; Statement-II is correct explanation for Statement-I.

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Statement-I is true, Statement-II is true ; Statement-II is not a correct explanation for Statement-I.

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Statement-I is true, Statement-II is false.

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Statement-I is false, Statement-II is true.

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Solution

The correct option is B Statement-I is true, Statement-II is true ; Statement-II is not a correct explanation for Statement-I.
The standard free energy changes of all spontaneously occurring reactions are negative.
When a process is spontaneous, the total entropy (sys+surr) increases and the Gibbs free energy decreases.
The standard free energies of the elements in their standard states at $1 b a r$ and $298 K$
are taken as zero.
Hence, statement-I is true, Statement-II is true ; Statement-II is not a correct explanation for Statement-I.

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