Chemistry
Grade-10
Easy
Question
Which of these equations represents a redox reaction?
- Ca(HCO3)2→ CaCO3 + H2O + CO2
- CH3COOH + NaOH → CH3COONa + H2O
- Zn + 2FeCl3 → ZnCl2 + 2FeCl2
- NaCl + AgNO3 → AgCl + NaNO3
Hint:
The term ‘redox’ is a short form of reduction-oxidation.
The correct answer is: Zn + 2FeCl3 → ZnCl2 + 2FeCl2
Redox reactions are oxidation-reduction chemical reactions in which the reactants undergo a change in their oxidation states. The term ‘redox’ is a short form of reduction-oxidation.
Zn + 2FeCl3 → ZnCl2 + 2FeCl2
Zn oxidation state increases from 0 to +2 and Fe oxidation state reduces from +3 to +2. This is a redox reaction.
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