Which represents a redox reaction?0/1A. NaH (s) + H2O (l) → NaOH (aq) + H2 (g)B. CaCO3 (s) → CaO (s) + CO2 (g)C. CuCl2 (aq) + K2S (aq) → CuS (s) + 2KCl (aq)D. HCl (aq) + NH3 (aq) → NH4+Cl− (aq)
Question
Which represents a redox reaction?0/1A. NaH (s) + H2O (l) → NaOH (aq) + H2 (g)B. CaCO3 (s) → CaO (s) + CO2 (g)C. CuCl2 (aq) + K2S (aq) → CuS (s) + 2KCl (aq)D. HCl (aq) + NH3 (aq) → NH4+Cl− (aq)
Solution
The redox reaction is represented by option C. CuCl2 (aq) + K2S (aq) → CuS (s) + 2KCl (aq).
In this reaction, copper (Cu) is reduced from a charge of +2 in CuCl2 to a charge of +1 in CuS. Simultaneously, sulfur (S) is oxidized from a charge of -2 in K2S to a charge of -1 in CuS.
Redox reactions involve a transfer of electrons from one species to another. In this case, electrons are transferred from sulfur to copper.
The other reactions do not involve a transfer of electrons and are therefore not redox reactions.
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