1.

Delta S^(0) will be highest for the reaction

Answer»

`N_(2)(g) + O_(2)(g) rarr 2NO (g)`
`CaCO_(3)(s) rarr CaO(s) + CO_(2)(g)`
`C(s) + O_(2)(g) rarr CO_(2)(g)`
`Ca(s) + (1)/(2) O_(2)(g) rarr CaO (s)`

ANSWER :A


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