NEET Chemistry: Electrochemistry — Practice Set 16

Q1. What is the equilibrium constant for a cell reaction with \( E^\circ_{cell} = 0.46 \, V \) at 298 K involving 2 electrons?

Q2. What is the standard Gibbs energy change for a cell with \( E^\circ_{cell} = 0.44 \, V \) and 2 electrons transferred? (F = 96500 C/mol)

Q3. How many Faradays are required to produce 20 g of magnesium from molten MgCl\(_2\)? (Atomic mass of Mg = 24 g/mol)

Q4. How many coulombs are required to deposit 0.81 g of magnesium from MgSO\(_4\) solution? (Atomic mass of Mg = 24 g/mol, F = 96500 C/mol)

Q5. The conductivity of a 0.015 M solution is 0.00195 S cm\(^{-1}\). What is its molar conductivity?

Q6. What is the standard emf of a cell with the reaction \( Sn(s) + Pb^{2+}(aq) \rightarrow Sn^{2+}(aq) + Pb(s) \)? (Given: \( E^\circ_{Sn^{2+}/Sn} = -0.14 \, V \), \( E^\circ_{Pb^{2+}/Pb} = -0.13 \, V \))

Q7. The molar conductivity of NH\(_4\)Cl at infinite dilution is 149.7 S cm\(^2\) mol\(^{-1}\). If \( \lambda^\circ_{NH_4^+} = 73.4 \, S \, cm^2 \, mol^{-1} \), what is \( \lambda^\circ_{Cl^-} \)?

Q8. In a fuel cell, 0.56 L of O\(_2\) gas (STP) is consumed at the cathode. How many grams of H\(_2\)O (molar mass 18 g/mol) are produced? (F = 96500 C/mol)

Q9. A cell reaction has \( E^\circ_{cell} = 0.74 \, V \) and \( \Delta_r G^\circ = -142610 \, J/mol \) at 298 K. How many electrons are transferred? (F = 96500 C/mol)

Q10. What is the standard emf of a cell with the reaction \( Co(s) + 2Ag^+(aq) \rightarrow Co^{2+}(aq) + 2Ag(s) \)? (Given: \( E^\circ_{Co^{2+}/Co} = -0.28 \, V \), \( E^\circ_{Ag^+/Ag} = 0.80 \, V \))

Chemistry — Electrochemistry

Set 16 of 20

15:00

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What is the equilibrium constant for a cell reaction with \( E^\circ_{cell} = 0.46 \, V \) at 298 K involving 2 electrons?