Chemical Effect of Current

A bulb placed in the electric circuit in the given experimental set-up does not glow because:

• The liquid used in the above experiment may be a strong electrolyte.

• The liquid used in the above experiment may not be conducting electricity.

• The bulb may be fused

• Both [b] and [c]

LED refers to:

• Light electrolyte diode

• Light emitting diode

• Less electrolyte demand

• Light electrolyte demand

Which one of the following is correct pair?

• Cathode - Positive electrode

• Anode - Negative electrode

• Cation - Negative ion

• Anion - Positive ion

• None of these

Which of the following is correct for electroplating a metal X with copper through electrolysis?

• Metal X-Anode

• Copper-Cathode

• Copper sulphate solution Electrolyte

• All the above

Electrode connected to negative terminal of the battery is a/an:

• Electrolyte         

• Anode

• Cathode

• None of these

To purify copper metal by electrolysis which of the following is used as electrolyte

• NaCl

  solution 

• CuSO4

  solution

• H2SO4

  solution

• MgSO4

  solution

Which gas is produced at anode when current passes through acidified water?

• Hydrogen

• Oxygen

• Nitrogen       

• None of these

Glowing of bulb when current passes through it is an example of:

• Chemical effect of electric current.

• Heating effect of electric current.

• Magnetic effect of electric current.

• All the above

The diagram shows a beaker containing a solution of zinc sulphate and two carbon electrodes. A battery is placed next to it. In order that the electrode P be plated with zinc

•  P must be connected to S and Q to R

•  P must be connected to S and Q to R

•  P must be connected to R and Q to S

• P and Q must be connected to R.

Which of the following statements is incorrect?

• Anode is an electrode connected to the positive terminal of the battery.

• Pure water is poor conductor of electricity.

• Pure water is poor conductor of electricity.

• Ions can have only a positive charge.