JAMB - Chemistry (2025 - No. 13)
2Na + Cl\(_2\) → 2NaCl
In the reaction above, the specie that undergoes reduction is
Na
NaCl
Cl\(^-\)
Cl\(_2\)
설명
By definitions, Reduction is defined as the gain of electrons or a decrease in oxidation state.
In the reaction, elemental chlorine (Cl₂) has an initial oxidation state of 0.
In the product, sodium chloride (NaCl), the chlorine is in the form of a chloride ion (Cl⁻), with an oxidation state of -1.
The change from an oxidation state of 0 to -1 indicates a gain of electrons and thus, Cl₂ is the species that undergoes reduction.
Consequently, the correct answer is option D.