Read the following chemical equations

reaction 1: 2KI + H2O2 -> 2KOH +I2

reaction 2: Cl2 + H2 -> 2HCl.

which of the following statements is true for both the chemical equations?

a) I is oxidized in reaction 1 and Cl2 is oxidized in reaction 2

b) I is reduced in reaction 1 and Cl2 is reduced in reaction 2

c) I is oxidized in reaction 1 and Cl2 is reduced in reaction 2

d) I is reduced in reaction 1 and Cl2 is oxidized in reaction 2

(a is wrong, i took the test)

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-