CBSE Class 12 Chemistry Worksheet - Electrochemistry. CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.
1. Mention the differences between electrolytic cell and electrochemical cell.
2. what will happen when a) Eext = 1.10 V, b) Eext < 1.10 V and c) Eext>1.10 V is applied on the cell Zn / Zn2+ || Cu2+/ Cu ?
3.What is SHE ? How will you determine the potential of a) Zn electrode b) Cu electrode using SHE ?
4. E0 Zn2+ / Zn = - 0.76 V and . E0 Cu2+ / Cu = + 0.34 V. What does positive and negative sign convey ?
5. Account for the following:
a) Zn displaces hydrogen from dilute HCl while Cu can not.
b) Li is the strongest reducing agent while Fluorine is strongest oxidising agent.
c) copper sulphate solution can not be stored in zinc vessel.
E0 Cu2+ / Cu = + 0.34 V E0 Zn2+ / Zn = - 0.76 VE0 Li+ / Li = - 3.05 V E0 F2 /2 F- = + 2.87 V)
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