CBSE
Multiple Choice QuestionsWhat is the effect of dilution on the equivalent conductance of strong electrolyte?
Decrease on dilution
Remains unchanged
Increase on dilution
None of the above
Calculate (in S cm2 mol-1) using appropriate molar conductances of the electrolytes listed in the given table
| Electrolyte | KCl | KNO3 | HCl | NaOAc | NaCl |
|
(S cm2 mol-1) |
149.9 | 145.0 | 426.2 | 91.0 | 126.5 |
at infinite dilution in H2O at 25C
517.2
305.0
390.7
217.5
Assertion : If standard reduction potential for the reaction Ag+ + e- Ag is 0.80 volt, then for the reaction 2Ag+ + 2e- 2Ag, it will be 1.60 volt.
Reason: If concentration of Ag+ ions is doubled, the standard electrode potential is also doubled.
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.
Ionic conductances of H+ and S at infinite dilution are x and y S cm2 equiv-1 . Hence , equivalent conductance of H2SO4 at infinite dilution is :
(x + y)
2(x + y)
2x + y
x + 2y
A conductivity cell has a cell constant of 0.5 cm-1. This cell when filled with 0.01 M NaCl solution has a resistance of 384 ohms at 25°C. Calculate the equivalent conductance of the given solution.
130.2 cm2 (g eq)-1
137.4 cm2 (g eq)-1
154.6 cm2 (g eq)-1
169.2 cm2 (g eq)-1
Corrosion of iron is essentially an electrochemical phenomenon where the cell reactions are :
Fe is oxidised to Fe2+ and dissolved oxygen in water is reduced to OH-
Fe is oxidised to Fe3+ and H2O is reduced to
Fe is oxidised to Fe2+ and H2O is reduced to
Fe is oxidised to Fe2+ and H2O is reduced to O2
On the basis of standard electrode potential of redox couples given below, find out which of the following is the strongest oxidising agent.
(E values : Fe3+ | Fe2+ = +0.77 V; I2(s) | I- = +0.54 V; Cu2+ | Cu = +0.34 V; Ag+ | Ag = +0.80 V)
Fe3+
I2(s)
Cu2+
Ag+
How many Faradays of electricity are required for the given reaction to occur ?
MnMn2+
5 F
3 F
1 F
7 F
How many moles of Pt may be deposited on the cathode when 0.80 F of electricity is passed through a 1.0 M solution of Pt4+ ?
1.0 mol
0.20 mol
0.40 mol
0.80 mol
An aqueous solution containing 6.5 g of NaCl of 90 purity was subjected to electrolysis. After the complete electrolysis, the solution was evaporated to get solid NaOH. The volume of 1 M acetic acid required to neutralise NaOH obtained above is :
1000 cm3
2000 cm3
100 cm3
200 cm3
