which of the following is a redox reaction -

a) CaCO3 - CaO + CO2

b) H2 + Cl2 - 2HCl

c) CaO + 2HCl - CaCl2 + H2O

d) NaOH + HCl - NaCl + H2O

b) H2 + Cl2 ----> 2HCl
  Is a redox reaction in which oxidation of H2 occurs and reduction of Cl2 occurs.

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