Study the following facts:Zn → Zn+2 + 2e― Eo = +0.76 VCu → Cu+2 + 2e― Eo = - 0.34 V
Correct answer: C. Cu+2 + Zn → Cu + Zn+2
- A. Cu + Zn+2 → Cu+2 + Zn
- B. Cu+2 + Zn+2 → Cu + Zn
- C. Cu+2 + Zn → Cu + Zn+2
- D. Cu+2 + Zn+2 → Cu + Zn+2
Explanation
The half cell equation with the lower Eo is the anode. Electrons travel from cathode to anode. (Flip the equation with the lower Eo and then 2e cancel out).the correct redox reaction involving Cu and Zn is: Cu+2 + Zn -> Cu + Zn+2Cu+2 + Zn -> Cu + Zn+2: This equation represents a redox reaction between copper ions (Cu2+) metal (Zn). In this reaction, copper ions gain two electrons to form copper metal, while zinc atoms two electrons to form zinc ions. This reaction is a spontaneous redox reaction because the potential of copper ions (Cu2+) is lower than that of zinc ions (Zn2+). Therefore, copper ions reduced, and zinc metal is oxidized.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Electrochemistry
Electrochemistry describes electron transfer through oxidation and reduction, identifies oxidizing and reducing agents, and applies oxidation numbers to balance redox equations. It also covers electrode potential and the standard hydrogen electrode, which provides the reference for comparing the reduction tendencies of other electrodes.
Practise Electrochemistry
696 free Electrochemistry MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Electrochemistry questions
By accepting an electron, a Hydronium ion is converted into:
In metal hydrides the oxidation number of hydrogen is:
In a galvanic cell, the Zinc Sulphate in the left beaker acquires?
In electrolysis of aqueous CuCl2, the metal deposited at the cathode is:
In MgCl2, the oxidation state of 'Cl' is :
In electrolytic cell, a salt bridge is used in order to: