NEET Chemistry: Electrochemistry — Practice Set 3

Q1. How many electrons are involved in the reduction of 1 mole of \( Cr_2O_7^{2-} \) to \( Cr^{3+} \) in acidic medium?

Q2. The molar conductivity of NaCl at infinite dilution is 126.4 S cm\(^2\) mol\(^{-1}\). If \( \lambda^\circ_{Na^+} = 50.1 \, S \, cm^2 \, mol^{-1} \), what is \( \lambda^\circ_{Cl^-} \)?

Q3. In a dry cell, what acts as the cathode?

Q4. During electrolysis of aqueous NiSO\(_4\) with Ni electrodes, 0.59 g of Ni (atomic mass 59 g/mol) is deposited at the cathode. If the same charge oxidizes water at the anode, what volume of O\(_2\) (STP) is produced? (F = 96500 C/mol)

Q5. A weak electrolyte has \( \Lambda_m^\circ = 400 \, S \, cm^2 \, mol^{-1} \) and \( \Lambda_m = 40 \, S \, cm^2 \, mol^{-1} \) at 0.1 M. What is the dissociation constant \( K_a \)?

Q6. The conductivity of a 0.05 M solution is 0.006 S cm\(^{-1}\). What is its molar conductivity?

Q7. What is the standard Gibbs energy change for a cell with \( E^\circ_{cell} = 1.23 \, V \) and 2 electrons transferred? (F = 96500 C/mol)

Q8. The limiting molar conductivity of MgSO\(_4\) is 266 S cm\(^2\) mol\(^{-1}\). If \( \lambda^\circ_{Mg^{2+}} = 106 \, S \, cm^2 \, mol^{-1} \), what is \( \lambda^\circ_{SO_4^{2-}} \)?

Q9. In the electrolysis of molten Al\(_2\)O\(_3\), what is the product at the anode?

Q10. In a mercury cell, if 0.68 g of Zn (atomic mass 68 g/mol) is oxidized at the anode, how many Faradays are involved?

Chemistry — Electrochemistry

Set 3 of 20

15:00

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Medium

How many electrons are involved in the reduction of 1 mole of \( Cr_2O_7^{2-} \) to \( Cr^{3+} \) in acidic medium?