During electrolysis of conc. H2SO4, perdisulphuric acid (H2S2O8), and O2 form in equimolar amount. The amount of H2 that will form simultaneously will be :
1. Thrice that of O2 in moles.
2. Twice that of O2 in moles.
3. Equal to that of O2 in moles.
4. Half of that of O2 in moles.
The equilibrium constant of the reaction:
Cu (s) + 2Ag+ (aq) Cu2+ (aq) + 2Ag(s) ;
Eo = 0.46 V at 298 K is:
1. | 2.4 x 1010 | 2. | 2.0 x 1010 |
3. | 4.0 x 1010 | 4. | 4.0 x 1015 |
The weight of silver (atomic weight = 108) displaced by a quantity of electricity which displaces 5600 mL of O2 at STP will be :
1. 5.4 g
2. 10.8 g
3. 54.0 g
4. 108.0 g
In the electrochemical cell:
Zn|ZnSO4(0.01 M) || CuSO4(1.0M),Cu, the emf of this Daniel cell is E1. When the concentration of ZnSO4 is changed to 1.0 M and that of CuSO4 is changed to 0.01 M, the emf changes to E2. The relationship between E1 and E2 is :
( Given, = 0.059)
1. E1 = E2
2. E1 < E2
3. E1 > E2
4. E2 = 0 E1
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 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.
The number of electrons involved in the deposition of 63.5 g of Cu from a solution of is:
1
2
3
4
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
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
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 |