CBSE
Multiple Choice QuestionsAssertion : Magnesium is extracted by the electrolysis of fused mixture of MgCl2, NaCl and CaCl2.
Reason : Calcium chloride acts as a reducing agent.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion : Reduction potential of Mn (+3 to +2) is more positive than Fe (+3 to +2).
Reason: Ionisation potential of Mn is more than that of Fe.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Calculate using appropriate molar conductances of the electrolytes listed above at infinite dilution in H2O at 25°C.
| Electrolyte | KCl | KNO3 | HCL | NaOAc | NaCl |
| 149.9 | 145.0 | 426.2 | 91.0 | 126.5 |
517.2
552.7
390.7
217.5
Assertion : Zinc displaces copper from copper sulphate solution.
Reason : The of zinc is= 0.76 V and that of copper is + 0.34 V.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Which one of the following condition will increase the voltage of the cell represented by the equation ?
Cu (s) + 2Ag+ (aq) Cu2+ (aq) + 2Ag (s)
Increase in the dimension of Cu electrode
Increase in the dimension of Ag electrode
Increase in the concentration of Cu2+ ion
Increase in the concentration of Ag+ ions
When a quantity of electricity is passed through CusO4 solution , 0.16 g of copper gets deposited .If the same quantity of electricity is passed through acidulated water , then the volume of H2 liberated at STP will be :
[Given : atomic weight of Cu = 64]
10 cm3
56 cm3
604 cm3
8.0 cm3
Which of the following electrolyte will have maximum flocculation value for Fe(OH)3 sol ?
NaCl
Na2S
(NH4)3PO4
K2SO4
The standard half-cell reduction potential for Ag+| Ag is 0.7991 V at 25°C. Given the experimental value Ksp= 1.56 x 10-10 for AgCl, calculate the standard half-cell reduction potential for the Ag | AgCl electrode.
0.2192V
-0.2192V
-1.2192 V
1.2192 V
Which of the following does not conduct electricity ?
Fused NaCl
Solid NaCl
Brine solution
Copper
For the electrochemical cell, M | M+ || X- | X, (M+| M) = 0.44 V and (X | X-) = 0.33 V. From this data one can deduce that
M + X- M- + X- is the spontateous reaction.
M+ + X- M + X is the spontaneous reaction.
Ecell = 0.77 V
Ecell = -0.77V
