- 1(current)
Q. No.A saturated solution of \(KNO_3\) is used to make 'salt-bridge' because:
1. Velocity of \(K^+\) is greater than that of \(NO^-_3\).
2. Velocity of \(NO^-_3\) is greater than that of \(K^+\) .
3. Velocities of both \(K^+\) and \(NO^-_3\) are nearly the same.
4. \(KNO_3\) is highly soluble in water.
1. Velocity of \(K^+\) is greater than that of \(NO^-_3\).
2. Velocity of \(NO^-_3\) is greater than that of \(K^+\) .
3. Velocities of both \(K^+\) and \(NO^-_3\) are nearly the same.
4. \(KNO_3\) is highly soluble in water.
Subtopic: Batteries & Salt Bridge |
80%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Match Column-I (Types of cell) with Column-II (Characteristics shown by cells) and mark the appropriate option:
| Column I (Type of cell) |
Column II (Characteristics) |
||
| A | Lechlanche cell | 1. | Cell reaction 2H2 +O2 → 2H2O |
| B | Ni-Cd cell | 2. | Does not involve any ion in solution and is used in hearing aids. |
| C | Fuel cell | 3. | Rechargeable |
| D | Mercury cell | 4. | -Reaction at anode, Zn → Zn2+ + 2e- |
Codes:
| Options: | A | B | C | D |
| 1. | 2 | 3 | 4 | 1 |
| 2. | 4 | 3 | 1 | 2 |
| 3. | 1 | 4 | 3 | 2 |
| 4. | 4 | 1 | 3 | 2 |
Subtopic: Batteries & Salt Bridge |
84%
Level 1: 80%+
Hints
| Assertion (A): | Mercury cell does not give steady potential. |
| Reason (R): | In the cell reaction, ions are not involved in the solution. |
| 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. |
Subtopic: Batteries & Salt Bridge |
62%
Level 2: 60%+
Hints
The correct statement about charging of the lead storage battery is:
| 1. | PbSO4 anode is reduced to Pb. |
| 2. | PbSO4 cathode is reduced to Pb. |
| 3. | PbSO4 cathode is oxidised to Pb. |
| 4. | PbSO4 anode is oxidised to PbO2. |
Subtopic: Batteries & Salt Bridge |
Level 3: 35%-60%
Hints
Links
In a typical fuel cell, the reactants (R) and products (P) are:
| 1. | R = H2(g), O2(g); P = H2O2(l) |
| 2. | R = H2(g), O2(g); P = H2O(l) |
| 3. | R = H2(g), O2(g), C l2(g); P = HClO4(aq) |
| 4. | R = H2(g), N2(g); P = NH3(aq) |
Subtopic: Batteries & Salt Bridge |
75%
Level 2: 60%+
NEET - 2020
Hints
The incorrect statement regarding \(H_2 - O_2 \) fuel cell among the following is:
| 1. | The cell was used for providing electrical power in the Apollo space program. |
| 2. | The energy of combustion is directly converted into electrical energy. |
| 3. | Concentrated aqueous NaOH solution is used as an electrolyte. |
| 4. | The reaction at anode is 4H2O(l) + 4e– → 2H2(g) + 4OH– (aq). |
Subtopic: Batteries & Salt Bridge |
59%
Level 3: 35%-60%
Please attempt this question first.
Hints
Please attempt this question first.
Match the items of Column I and Column II.
| Column I | Column II | ||
| A | Lead storage battery | 1. | Maximum efficiency |
| B | Mercury cell | 2. | Prevented by galvanization |
| C | Fuel cell | 3. | Gives steady potential |
| D | Rusting | 4. | Pb is an anode, PbO2 is cathode |
Codes:
| Options: | A | B | C | D |
| 1. | 2 | 3 | 4 | 1 |
| 2. | 1 | 2 | 3 | 5 |
| 3. | 5 | 4 | 3 | 2 |
| 4. | 4 | 3 | 1 | 2 |
Subtopic: Batteries & Salt Bridge |
91%
Level 1: 80%+
Hints
The compound among the following that can be used as fuel in the fuel cells is-
| 1. | Methane | 2. | Methanol |
| 3. | Sulphuric acid | 4. | Both 1 and 2 |
Subtopic: Batteries & Salt Bridge |
63%
Level 2: 60%+
Hints
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. |
Subtopic: Batteries & Salt Bridge |
79%
Level 2: 60%+
Hints
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