03. ELECTROCHEMISTRY[KARNATAKA CET EXCLUSIVE]
CHEMISTRY(KCET)

285400 For a cell involving two electron changes,Ecell = 0.3 V at 25C. The equilibrium constant of the reaction is

1 1010
2 3×102
3 10
4 1010
CHEMISTRY(KCET)

285401 By passing electric current,NaClO3 is converted into NaClO4 according to the following equation:

NaClO3+H2ONaClO4+H2
How many moles of NaClO4 will be formed when three faradays of charge is passed through NaClO3 ?

1 0.75
2 3.0
3 1.5
4 1.0
CHEMISTRY(KCET)

285402 In the electrolysis of aqueous sodium chloride solution, which of the half cell reaction will occur at anode?

1 Cl(aq )12Cl2+e;
Ecell=1.36 volts 
2 2H2O(l)O2+4H++4e; Ecell =1.23 volts
3 Na+(aq )+eNa(s);
E=2.71 volts
4 H+(aq )+e12H2;
Ecell =0.00 volts 
CHEMISTRY(KCET)

285403 Which of the following is incorrect in a galvanic cell?

1 Oxidation occurs at anode.
2 Reduction occurs at cathode.
3 The electrode at which electrons are gained is called cathode.
4 The electrode at which electrons are lost is called cathode.
CHEMISTRY(KCET)

285400 For a cell involving two electron changes,Ecell = 0.3 V at 25C. The equilibrium constant of the reaction is

1 1010
2 3×102
3 10
4 1010
CHEMISTRY(KCET)

285401 By passing electric current,NaClO3 is converted into NaClO4 according to the following equation:

NaClO3+H2ONaClO4+H2
How many moles of NaClO4 will be formed when three faradays of charge is passed through NaClO3 ?

1 0.75
2 3.0
3 1.5
4 1.0
CHEMISTRY(KCET)

285402 In the electrolysis of aqueous sodium chloride solution, which of the half cell reaction will occur at anode?

1 Cl(aq )12Cl2+e;
Ecell=1.36 volts 
2 2H2O(l)O2+4H++4e; Ecell =1.23 volts
3 Na+(aq )+eNa(s);
E=2.71 volts
4 H+(aq )+e12H2;
Ecell =0.00 volts 
CHEMISTRY(KCET)

285403 Which of the following is incorrect in a galvanic cell?

1 Oxidation occurs at anode.
2 Reduction occurs at cathode.
3 The electrode at which electrons are gained is called cathode.
4 The electrode at which electrons are lost is called cathode.
CHEMISTRY(KCET)

285404 A secondary cell is one which

1 can be recharged
2 can be recharged by passing current through it in the same direction
3 can be recharged by passing current through it in the opposite direction
4 cannot be recharged.
CHEMISTRY(KCET)

285400 For a cell involving two electron changes,Ecell = 0.3 V at 25C. The equilibrium constant of the reaction is

1 1010
2 3×102
3 10
4 1010
CHEMISTRY(KCET)

285401 By passing electric current,NaClO3 is converted into NaClO4 according to the following equation:

NaClO3+H2ONaClO4+H2
How many moles of NaClO4 will be formed when three faradays of charge is passed through NaClO3 ?

1 0.75
2 3.0
3 1.5
4 1.0
CHEMISTRY(KCET)

285402 In the electrolysis of aqueous sodium chloride solution, which of the half cell reaction will occur at anode?

1 Cl(aq )12Cl2+e;
Ecell=1.36 volts 
2 2H2O(l)O2+4H++4e; Ecell =1.23 volts
3 Na+(aq )+eNa(s);
E=2.71 volts
4 H+(aq )+e12H2;
Ecell =0.00 volts 
CHEMISTRY(KCET)

285403 Which of the following is incorrect in a galvanic cell?

1 Oxidation occurs at anode.
2 Reduction occurs at cathode.
3 The electrode at which electrons are gained is called cathode.
4 The electrode at which electrons are lost is called cathode.
CHEMISTRY(KCET)

285404 A secondary cell is one which

1 can be recharged
2 can be recharged by passing current through it in the same direction
3 can be recharged by passing current through it in the opposite direction
4 cannot be recharged.
CHEMISTRY(KCET)

285400 For a cell involving two electron changes,Ecell = 0.3 V at 25C. The equilibrium constant of the reaction is

1 1010
2 3×102
3 10
4 1010
CHEMISTRY(KCET)

285401 By passing electric current,NaClO3 is converted into NaClO4 according to the following equation:

NaClO3+H2ONaClO4+H2
How many moles of NaClO4 will be formed when three faradays of charge is passed through NaClO3 ?

1 0.75
2 3.0
3 1.5
4 1.0
CHEMISTRY(KCET)

285402 In the electrolysis of aqueous sodium chloride solution, which of the half cell reaction will occur at anode?

1 Cl(aq )12Cl2+e;
Ecell=1.36 volts 
2 2H2O(l)O2+4H++4e; Ecell =1.23 volts
3 Na+(aq )+eNa(s);
E=2.71 volts
4 H+(aq )+e12H2;
Ecell =0.00 volts 
CHEMISTRY(KCET)

285403 Which of the following is incorrect in a galvanic cell?

1 Oxidation occurs at anode.
2 Reduction occurs at cathode.
3 The electrode at which electrons are gained is called cathode.
4 The electrode at which electrons are lost is called cathode.
CHEMISTRY(KCET)

285404 A secondary cell is one which

1 can be recharged
2 can be recharged by passing current through it in the same direction
3 can be recharged by passing current through it in the opposite direction
4 cannot be recharged.
CHEMISTRY(KCET)

285400 For a cell involving two electron changes,Ecell = 0.3 V at 25C. The equilibrium constant of the reaction is

1 1010
2 3×102
3 10
4 1010
CHEMISTRY(KCET)

285401 By passing electric current,NaClO3 is converted into NaClO4 according to the following equation:

NaClO3+H2ONaClO4+H2
How many moles of NaClO4 will be formed when three faradays of charge is passed through NaClO3 ?

1 0.75
2 3.0
3 1.5
4 1.0
CHEMISTRY(KCET)

285402 In the electrolysis of aqueous sodium chloride solution, which of the half cell reaction will occur at anode?

1 Cl(aq )12Cl2+e;
Ecell=1.36 volts 
2 2H2O(l)O2+4H++4e; Ecell =1.23 volts
3 Na+(aq )+eNa(s);
E=2.71 volts
4 H+(aq )+e12H2;
Ecell =0.00 volts 
CHEMISTRY(KCET)

285403 Which of the following is incorrect in a galvanic cell?

1 Oxidation occurs at anode.
2 Reduction occurs at cathode.
3 The electrode at which electrons are gained is called cathode.
4 The electrode at which electrons are lost is called cathode.
CHEMISTRY(KCET)

285404 A secondary cell is one which

1 can be recharged
2 can be recharged by passing current through it in the same direction
3 can be recharged by passing current through it in the opposite direction
4 cannot be recharged.