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Solution


Q.

Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidizing behaviour           [2016]
1 Cu+2H2SO4⟶CuSO4+SO2+2H2O  
2 S+2H2SO4⟶3SO2+2H2O  
3 C+2H2SO4⟶CO2+2SO2+2H2O  
4 CaF2+H2SO4⟶CaSO4+2HF    

Ans.

(4)

CaF2+H2SO4→CaSO4+2HF

Here, the oxidation state of every atom remains the same, so it is not a redox reaction.