A solution of concentration C g equiv/L has a specific resistance R. The equivalent conductance of the solution is
R/C
C/R
1000/RC
1000R/C
For the following cell reaction,
Ag | Ag+ | AgCl | Cl | Cl2, Pt
(AgCl) = - 109 kJ/ mol
(Cl) = -129 kJ/ mol
(Ag+) = 78 kJ/ mol
E° of the cell is
-0.60 V
0.60 V
6.0 V
None of these
Which one of the following is most effective in causing the coagulation of an As2S3 sol?
KCl
AlCl3
MgSO4
K3Fe(CN)6
At a certain temperature and at infinite dilution, the equivalent conductances of sodium benzoate, hydrochloric acid and sodium chlonde are 240, 349 and 229 ohm-1 cm2equiv-1 respectively. The equivalent conductance of benzoic acid in ohm-1 cm2equiv-1 at the same conditions is
80
328
360
408
Match the following-
List - I | List - II |
A. Potential of hydrogen electrode at pH = 10 | i. 0.76 V |
B. Cu2+ | Cu | ii. 0.059 |
C. Zn | Zn2+ | iii. -0.591 V |
D. |
iv. 0.037 V v. -0.76 V |
A - iii; B - i; C - ii; D - v
A - ii; B - v; C - i; D - iv
A - iii; B - iv; C - i; D - ii
A - v; B - i; C - iv; D - ii
If the values of of NH4Cl, NaOH and NaCl are 130, 217 and 109 ohm-1 cm2 equiv-1 respectively, the of NH4OH in ohm-1 cm2 equiv-1 is
238
196
22
456
During the electrolysis of copper sulphate aqueous solution using copper electrode, the reaction taking place at the cathode is
Cu → Cu2+ (aq) + 2e-
Cu2+ (aq) + 2e- → Cu (s)
H+ (aq) + e- → H2 (g)
SO (aq) → SO3 (g) + O2 (g) + 2e-
The extent of charge of lead accumulator is determined by
amount of PbSO4 in the battery
amount of PbO2 in the battery
specific gravity of H2SO4 of the battery
amount of Pb in the battery
The emf (in V) of a Daniell cell containing 0.1 M ZnSO4 and 0.01 M CuSO4 solutions at their respective electrodes is
1.10
1.16
1.13
1.07
The role of copper diaphragm in Whytlaw-Gray's method is
preventing the corrosion of electrolytic cell
preventing the mixing of H2 and F2
as anode
as cathode