If both concentrated and dilute sulphuric acid on Thermal decomposition produces nascent oxygen, then why does not both act as oxidising agent?

Dear student,

Decomposition of sulphuric acid- 
H2SO4 →→ H2O + SO2 + [O]

The liberation of nascent oxygen [O] give rise to oxidising property of sulphuric acid. This nascent oxygen brings about a number of oxidation reaction. Both metals and non-metals are oxidised by concentrated sulphuric acid which is reduced to sulphur dioxide.  
Dilute sulphuric acid does not produce nascent oxygen


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