Question

Spontaneity of RedOx Reactions

For all of the following experiments, under standard conditions, which species could be spontaneously produced?

Oxygen gas is bubbled through an acidified solution of Fe²⁺
yes no  H₂O
yes no  No reaction
yes no  Fe

Cl₂ gas is bubbled into a solution of NaI.
yes no  No reaction
yes no  Na
yes no  I₂

Crystals of I₂ are added to a solution of NaCl.
yes no  Na
yes no  No reaction
yes no  Cl₂

Answer 1

1) Oxygen gas is bubbled through through an acidified solution of Fe2+

H20(water) - Yes

No reaction -  No

Fe (iron) -   No

The redox reaction taking place is ,   ​​​​​​

4 Fe2+ + 0 + 4H+ + 4Fe3+ + 2H2O

Fe2+ oxidises to Fe3+ and H+ reduces to H2O.

2) Cl2 gas is bubbled into a solution of NaI,

No reaction -  No

  Na (sodium) - No

  I2 ( Iodine gas) - Yes

Here the redox reaction taking place is

2Nal + Cl + 12 + 2Naci

Here Iodide ion(I-) oxidises to iodine gas and Cl2(charge=0) gas reduces to Chloride ion(Cl-).

3) Crystals of I2 are added to a solution of NaCl ,

​​​​​​Na(sodium) -  No

No reaction -  Yes

Cl2 (Chlorine) -   No

Here no reaction takes place, because Iodine is less electronegative than Chlorine. It's not powerful enough to displace Chlorine. The oxidation power of Iodine is less than Chlorine.