Question

Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reaction does not show oxidizing behaviour?

• A. ${ Cu + 2H2SO4 -> CuSO4 + SO2 + 2H2O }$
• B. ${3S + 2H2SO4 -> 3SO2 + 2H2O }$
• C. ${ C + 2H2SO4 -> CO2 + 2SO2 + 2H2O }$
• D. ${ CaF2 + H2SO4 -> CaSO4 + 2HF }$

Answer 1

Answer: (D)

${ CaF2 + H2SO4 -> CaSO4 + 2HF }$

Answer 2

$1^{st}$ reaction is not a redox reaction as the oxidation number of elements remains unchanged.