12)
In reactant, oxidation state of Fe is +3 and 0
In product, oxidation state of Fe is +2
So,
Oxidation state of Fe is changing from +3 to +2 which is
reduction.
Oxidation state of Fe is changing from 0 to +2 which is
oxidation.
So, there is both reduction and oxidation taking place.
Answer: A
13)
Mass = 15.0 mg = 0.0150 g
Molar mass = 309.36 g/mol
Use:
Number of mol = mass / molar mass
= 0.0150 g / 309.36 g/mol
= 4.85*10^-5 mol
Answer: D
Only 1 question at a time please
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