General
✓✗Assertion: The limiting molar conductivity of CH3COOH can be calculated from those of HCl, NaCl and CH3COONa.
Reason: At infinite dilution each ion migrates independently.
Reason: At infinite dilution each ion migrates independently.
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- Assertion is true but Reason is false
- Both Assertion and Reason are false
General
✓✗A battery delivers a current of 0.1 A for 2 hours. The mass of Zn consumed at the anode of a zinc-based cell is (Zn = 65.4 g mol−1)
- 0.122 g
- 0.488 g
- 0.004 g
- 0.244 g
General
✓✗For the disproportionation 3Au+ → Au3+ + 2Au, given E°(Au+/Au) = 1.69 V and E°(Au3+/Au+) = 1.40 V, E°cell is
- 1.55 V
- 3.09 V
- −0.29 V
- 0.29 V
General
✓✗Assertion: Conductivity of an electrolyte solution decreases on dilution.
Reason: The number of ions per unit volume decreases on dilution.
Reason: The number of ions per unit volume decreases on dilution.
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- Assertion is true but Reason is false
- Both Assertion and Reason are false
General
✓✗Assertion: Zinc displaces copper from copper sulphate solution.
Reason: The standard reduction potential of zinc is less than that of copper.
Reason: The standard reduction potential of zinc is less than that of copper.
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- Assertion is true but Reason is false
- Both Assertion and Reason are false
General
✓✗In the electrolysis of molten NaCl, the product at the cathode is
- sodium metal
- hydrogen gas
- chlorine gas
- oxygen gas
General
✓✗For the cell Pt|H2(1 bar)|H+(1 M)||Cu2+(1 M)|Cu, the emf is +0.34 V. This means
- Cu2+ is reduced more easily than H+
- the SHE acts as the cathode
- copper is oxidised at the cathode
- H+ is reduced more easily than Cu2+
General
✓✗The electrical work done by a galvanic cell is maximum when the cell operates
- with the salt bridge removed
- irreversibly at high current
- at zero temperature
- reversibly
General
✓✗Sodium metal cannot be obtained by electrolysis of aqueous NaCl because
- Na+ is reduced to Na−
- water is reduced in preference to Na+
- Cl− is reduced
- NaCl does not ionise in water
General
✓✗In the electrochemical cell Zn|ZnSO4(0.01 M)||CuSO4(1.0 M)|Cu, the emf of this Daniell cell is E1. When the concentration of ZnSO4 is changed to 1.0 M and that of CuSO4 to 0.01 M, the emf changes to E2. The relationship between E1 and E2 is (given 2.303RT/F = 0.059 V)
- E1 > E2
- E2 = 0 ≠ E1
- E1 < E2
- E1 = E2
General
✓✗The standard Gibbs energy change for the Daniell cell reaction (E°cell = 1.10 V) is
- −106.2 kJ mol−1
- −424.6 kJ mol−1
- 212.3 kJ mol−1
- −212.3 kJ mol−1
General
✓✗Two electrolytic cells containing ZnSO4 and CuSO4 are connected in series. If 1.30 g of Zn is deposited, the mass of Cu deposited is (Zn = 65, Cu = 63.5)
- 1.30 g
- 0.64 g
- 1.27 g
- 2.54 g
General
✓✗The charge required to deposit 1.08 g of silver from AgNO3 solution is (Ag = 108 g mol−1)
- 965 C
- 9650 C
- 1930 C
- 96500 C
General
✓✗Which of the following is NOT a feature of fuel cells?
- They work as long as reactants are supplied
- They are pollution free (H2−O2)
- They need to be recharged like a storage battery
- Catalysts such as finely divided Pt or Pd are used
General
✓✗The voltage of a dry cell is about
- 1.5 V
- 12 V
- 2.0 V
- 1.35 V