Arrange the following in increasing order?

a. reducing property of Cu, Fe, H2, Zn
b. oxidazing property of Cu2+, Fe2+, H+, Zn2+
c. oxidizing property of Cl2, Br2, I2
d. reducing property of Cl-, Br-, and I-

Answer:
a)
Zn>H2>Fe>Cu

Look up the standard reduction potentials. The lower the SRP, the greater is the reducing power.

b)
Cu(2+)>Fe(+2)>H(+)>Zn(+2)
The greater reducing power of the base element accounts for the greater stability of the corresponding cation formed.

c)
Cl2 > Br2>I2
Look up the standard reduction potentials. The greater the SRP, the greater is the oxidising power. As another approach, the reactivity decreases from chlorine to iodine.

d)
I(-) > Br(-) > Cl(-)
Similar argument as in (b)

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