Saturated solution of KNO3 is used to make 'salt-bridge' because:

1. velocity of K+ is greater than that of NO3-

2. velocity of NO3- is greater than that of K+

3. Velocities of both K+ and NO3- are nearly the same

4. KNO3 is highly soluble in water

Subtopic:  Batteries & Salt Bridge |
 75%
From NCERT
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When a lead storage battery is discharged, then:

1. SO2 is evolved.

2. Lead is formed.

3. Lead sulphate is consumed.

4. Sulphuric acid is consumed.

Subtopic:  Batteries & Salt Bridge |
 58%
From NCERT
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A depolariser used in dry cell batteries is: 

1. Ammonium chloride 

2. Manganese dioxide

3. Potassium hydroxide 

4. Sodium phosphate

Subtopic:  Batteries & Salt Bridge |
 51%
From NCERT
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If a salt bridge is removed from the two half cells, the voltage:

1. Drops to zero.

2. Does not change.

3. Increases gradually.

4. Increases rapidly.

Subtopic:  Batteries & Salt Bridge |
 76%
From NCERT
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A device that converts energy of the 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

Subtopic:  Electrolytic & Electrochemical Cell | Batteries & Salt Bridge |
 83%
From NCERT
NEET - 2015
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The efficiency of a fuel cell is given by:

1. HG

2. GS

3. GH

4. SG

Subtopic:  Batteries & Salt Bridge |
 65%
AIPMT - 2007
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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 |
From NCERT
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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 |
 73%
From NCERT
NEET - 2020
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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 |
 77%
From NCERT
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