Question

Can a displacement reaction be a redox reaction. Explain with suitable examples

Answer 1

Yes, a displacement reaction is also a Redox reaction as it is always accompanied by oxidation-reduction. In this type of reaction, more electronegative chlorine displaces iodine from the salt potassium iodide. 
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Answer 2

Redox reactions can occur relatively slowly, as in the formation of rust, or much more rapidly, as in the case of burning fuel. There are simple redox processes, such as the oxidation of carbon to yield carbon dioxide (CO2) or the reduction of carbon by hydrogen to yield methane (CH4), and more complex processes such as the oxidation of glucose (C6H12O6) in the human body. Analysis of bond energies and ionization energies in water allow calculation of the redox potentials.[5][6]