Answer:
6 Cl0 + 6 e- → 6 Cl-I (reduction)
2 Fe0 - 6 e- → 2 FeIII (oxidation)
Wouldn’t it be half of each? For 36 I guess is 18 and 54 will be 27, (NOT SURE)
Combustion reactions release energy in the form of heat.
Hope this helps and tell me if you need more help!
B.
The cynobacteria were already there without the oxygen, so that rules out A, and a lot of prokaryotes were anaerobic, so that rules out C. Finally, Photosynthesis does not require oxygen. Instead, Oxygen is a waste product of it. Therefore, it cannot be D. So, we are only left with B
Hoped this helped :D
Hydroxide ion is a strong and would react with H+ to form water
OH-+H+---->H2O