The for a 0.00099 M solution. The reciprocal of the degree of dissociation of acetic acid, if for acetic acid is 400 S will be:
1. | 7 | 2. | 8 |
3. | 9 | 4. | 10 |
Given cell:
Pt(s)|H2(g)(P = 1 atm)| CH3COOH(0.1 M), HCl(0.1 M) || KCl(aq)|Hg2Cl2(s)|Hg
EMF of the cell is found to be 0.045 V at 298 K and the temperature coefficient is 3.4×10-4 V K-1. The cell entropy change of the following cell is :
[Given Ka CH3COOH = 10-5 M]
1. 70.8 J K−1 mol−1
2. 65.2 J K−1 mol−1
3. 79.2 J K−1 mol−1
4. 83.5 J K−1 mol−1
Value of for (strong electrolyte) in water at from the data below is:
Conc. (mol/litre) | 0.25 | 1 |
260 | 250 |
1. 270 Ω-1 cm2 mol-1
2. 260 Ω-1 cm2 mol-1
3. 250 Ω-1 cm2 mol-1
4. 255 Ω-1 cm2 mol-1
The number of electrons involved in the deposition of 63.5 g of Cu from a solution of is:
1
2
3
4
The specific conductivity of a solution depends upon :
1. Number of ions as well as mobility of ions.
2. Number of ions per cc or (cm3) of solution.
3. Number of ions per cc or (cm3) as well as mobilities of ions.
4. Mobilities of ions.
During discharge of a lead storage cell, the density of sulphuric acid in the cell-
1. Increases.
2. Decreases.
3. Remains unchanged.
4. Initially increases but decreases subsequently.
The molar conductivity of a 0.5 mol/dm3 solution of AgNO3 with electrolytic conductivity of 5.76 × 10–3 S cm–1 at 298 K is:
1. 11.5 S cm2/mol
2. 21.5 S cm2/mol
3. 31.5 S cm2/mol
4. 41.5 S cm2/mol
The number of electrons delivered at the cathode during electrolysis by a current of 1 ampere in 60 seconds is:
(Charge on electron = 1.60 × 10–19 C)
1.
2.
3.
4.
The pressure of H2 required to make the potential of H2 - electrode zero in pure water at 298 K is:
1. | 10–12 atm | 2. | 10–10 atm |
3. | 10–4 atm | 4. | 10–14 atm |
A device that converts the energy of combustion of fuels, like hydrogen and methane, directly into electrical energy is known as:
1. | Fuel cell. | 2. | Electrolytic cell. |
3. | Dynamo. | 4. | Ni-Cd cell. |