ESAT (Engineering and Science Admissions Test) · Chemistry

Oxidation, reduction and redox

5 practice questions, each with the answer and an explanation.

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In the reaction $Zn + Cu^{2 +} \to Zn^{2 +} + Cu$ , which statement is correct?
Which half-equation shows reduction?
What is the oxidation number of manganese in the permanganate ion, $MnO_{4}^{-}$ ?
Chlorine reacts with cold aqueous sodium hydroxide: $Cl_{2} + 2 NaOH \to NaCl + NaClO + H_{2} O$ . What happens to chlorine?
In the equation $Fe_{2} O_{3} + 3 CO \to 2 Fe + 3 CO_{2}$ , which substance is the reducing agent?

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