Question

Nascent oxygen reacts with lead sulphide to form lead sulphate reaction

Answer 1

This is a semi-standard example of why 'naive' balancing does not work.

Ozone is a source of atomic oxygen, producing free oxygen molecules. So, in 'mild' conditions only one oxygen per ozone molecule would react as a strong oxidizer, and the remaining molecular oxygen would require elevated temperatures to react. Thus the equation would be
PbS + 4O3 -> PbSO4 + 4 O2

Similarly, in excess of reducer at elevated temperature (though why would you want it with ozone is another matter) all atoms in ozone would react. Thus, the reaction should be
3PbS + 4O3 -> 3PbSO4

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