Q. No.The potential of hydrogen electrode in contact with a solution with pH =10, is:
1.
−0.0591 V
2.
−5.91 V
3.
0.0591 V
4.
−0.591 V
The emf of the cell in which the following reaction takes place is:
Ni(s)+2Ag+(0.002 M) →Ni2+(0.160 M) + 2Ag(s)
( Given that \(E_{cell}^{o}\)= 1.05 V)
1. Ecell= 9.14 V
2. Ecell= 0.0914 V
3. Ecell= 0.00914 V
4. Ecell= 0.914 V
The cell in which the following reactions occurs:
2Fe3+(aq)+2I-(aq)→2Fe2+(aq)+I2(s) has \(E_{cell}^{o}\)= 0.236 V at 298 K.
The standard Gibbs energy of the cell reaction is -
1. 41.14 kJ mol−1
2. 45.54 kJ mol−1
3. −49.94 kJ mol−1
4. −45.54 kJ mol−1
| Assertion (A): | The conductivity of a solution decreases with dilution. |
| Reason (R): | Conductivity of a solution depends on the number of ions and the number of ions decreases when the solution is diluted. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Calculate the value of the dissociation constant for methanoic acid with a molar conductivity of 46.1 S cm² mol⁻¹ at 0.025 mol L⁻¹ concentration?
Given λ°(H+)= 349.6 S cm2 mol−1 and λ°(HCOO−) = 54.6 S cm2 mol
1. \(1.27×10^{-4}~mol ~L^{−1}\)
2. \(5.17×10^{-5}~mol ~L^{−1}\)
3. \(3.67×10^{-4}~mol ~L^{−1}\)
4. \(4.87×10^{-5}~mol ~L^{−1}\)
The number of electrons flow through the wire when a current of 0.5 ampere flows through a metallic wire for 2 hours, is-
1. \(6.25×10^{22}\)
2. \(2.25×10^{22}\)
3 \(8.25×10^{22}\)
4. \(4.25×10^{22}\)
The metals among the following that can be extracted electrolytically is -
| 1. | K | 2. | Na |
| 3. | Al | 4. | All of the above |
\(Cr_{2}O_{7}^{2-}\) + 14H++ 6e−→2Cr3+ + 7H2O
The quantity of electricity in coulombs needed to reduce 1 mol of \(Cr_{2}O_{7}^{2-}\) is-
1. 5F
2. 3F
3. 6F
4. 2F
| 1. | Methane | 2. | Methanol |
| 3. | Sulphuric acid | 4. | Both 1 and 2 |
Rusting of iron is envisaged as setting up of an electrochemical cell because:
| 1. | Oxidation of iron takes place during rusting. |
| 2. | Reduction of iron takes place. |
| 3. | Iron shows disproportionation reaction. |
| 4. | Oxygen is getting oxidised. |
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