Electrochemical Cells, Galvanic Cells

Q.

How can chemical energy be converted into electrical energy?

Q.

Explain Daniel cell with cell diagram representation and process taking place in the cell.

Q. Which of the following represents the cathode half cell of a Daniell cell?

1. $Zn$ rod in $CuS{O}_4$ solution
2. $Zn$ rod in $ZnS{O}_4$ solution
3. $Cu$ rod in $ZnS{O}_4$ solution
4. $Cu$ rod in $CuS{O}_4$ solution

Q. A saturated solution of $KN{O}_3$ is used to make a salt bridge because

1. the velocity of $K^{+}$ is greater than that of $N{O}_3^{-}$
2. the velocity of $K^{+}$ is lesser than that of $N{O}_3^{-}$
3. the velocity of $K^{+}$ and $N{O}_3^{-}$ are nearly the same
4. $KN{O}_3$ is highly soluble in water

Q. 61. 4g H2, 32g O2, 14g N2 and 11g CO2 are taken in a bulb of 500ml. Which one of these has maximum active mass ? (1)H2 (2)O2 (3)N2 (4)CO2

Q.

The nature of electolytes used in a salt bridge are:

1. Inert electrolytes

2. Any electrolyte can be used

3. Weak electrolytes

4. Non electrolytes

Q.

Which of the following is FALSE regarding the salt bridge used in voltaic cells? The salt bridge:

1. allows two half-cells to be separated

2. maintains electrical neutrality in half cells

3. allows mixing of the two electrode solutions

4. allows ions to cross over slowly

Q. whats the n factor and how to find n factor in redox reactions?

Q. In the down's process for the manufacture of sodium, the following is/are correct.

1. Cathode : graphite

2. cathode : iron

3. Anode : graphite

4. Anode : iron

Q. a current of 9.65A flowing for 10min deposits 3.0g of metal the equivalent weight of the metal

Q.

Assertion : Salts like $KCl,KN{O}_3$ i.e., inert electrolytes are used in salt bridge.

Reason : An inert electrolyte can easily be filled in the U-tube.

1. If both assertion and reason are true and the reason is the correct explanation of the assertion.
2. If both assertion and reason are true but reason is not the correct explanation of the assertion.
3. If assertion is true but reason is false.
4. If the assertion and reason both are false.

Q. When a lead storage battery is charged, it acts as:

1. A fuel cell
2. An electrolytic cell
3. A galvanic cell
4. A concentration cell

Q. 4gH2, 32g o2 , 14gn2 and 1 g co2 are taken in a bulb of 500 ml which one of these have max active mass 1)H2 2)O2 3)N2 4)CO2

Q. Which of the following represents the anode half cell reaction of a Daniel cell?

1. $Cu\left(s\right)\to C{u}^{2+}\left(aq\right)+2e^{-}$
2. $C{u}^{2+}\left(aq\right)+2e^{-}\to Cu\left(s\right)$
3. $Zn\left(s\right)\to Z{n}^{2+}\left(aq\right)+2e^{-}$
4. $Z{n}^{2+}\left(aq\right)+2e^{-}\to Zn\left(s\right)$

Q. Which of the following is true for the electrochemical Daniel cell?

1. Electrons flow from copper electrode to zinc electrode
2. Current flows from zinc electrode to copper electrode
3. Cations move towards copper electrode
4. Anions move towards copper electrode

Q. Which of the following is true for electrolytic cell?

1. Non-spontaneous reaction will occur
2. Electrons flow is opposite to galvanic cell
3. Both (b) and (c)
4. Spontaneous reaction will occur

Q. 12. Why is H_2+Br_2=2HBr a redox reaction?

Q. An electrochemical cell stops working after sometime because:-

1. Electrode potential of both the electrodes becomes zero
   
2. Electrode potential of both the electrodes becomes equal
   
3. The reaction starts proceeding in opposite direction
   
4. None of these

Q. Consider the following reaction
$Mn{O}_4^{-}+8H^{+}+5e^{-}\to M{n}^{+2}+4H_{2}O,$
$E^o=1.51V.$

The quantity of electricity required in Faraday to reduced five moles of $Mn{O}_4^{-}$ is
(Integer answer)

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Q.

Using the standard electrode potentials given in the Table 8.1, predict if the reaction between the following is feasible:

(a) Fe³⁺(aq) and I^–(aq)

(b) Ag⁺(aq) and Cu(s)

(c) Fe³⁺ (aq) and Cu(s)

(d) Ag(s) and Fe³⁺(aq)

(e) Br₂(aq) and Fe²⁺(aq)

Q. 4 g of H2 is present in a 500 ml bulb. The active mass of H2 will be ?

Q. Which of the following is correct regarding electrolytic cell?

1. A device that convert electrical energy into chemical energy
2. A device that convert electrical energy into mechanical energy
3. A device that convert chemical energy into electrical energy
4. A device that convert mechanical energy into electrical energy

Q. Which of the following is true for the electrochemical Daniel cell?

1. Electrons flow from copper electrode to zinc electrode
2. Current flows from zinc electrode to copper electrode
3. Cations move towards copper electrode
4. Anions move towards copper electrode

Q. Salt bridge contains inert electrolytes like as $KN{O}_{3}andKCl$ which have no tendency to take part in redox reactions.

1. True
2. False

Q. Which of the following statement is incorrect about secondary batteries?

1. Act as galvanic cell during discharge
2. It can be recharged
3. Act as electrolytic cell during charging
4. It cannot be reused