Chemical Effects Of Electric Current

During electrolysis of water we get.....

• hydrogen and oxygen

• negative and positive ions

• hydrogen and oxides

• anode and cathode

Which part of an atom is responsible for flow of current?

• ions

• proton

• neutron

• electron

Which of the following is not used for electroplating metal articles?

• Nickel

• Silver

• Chromium

• Sodium

An electrolyte is

• a metal

• a liquid that conducts current

• a non-metal

• none of these

In the figure given,Which of these two circuits shows the correct observation.

• A

• B

• Both A and B

• None of the above

An experiment was conducted to test the conductivity of two solutions A and B.The bulb glows in circuit A but not in B.What does this experiment say about the nature of the solution?

• Solution A is a good conductor.

• Solution B does not have charged ions.

• Impurities can be added to solution B to make it a better conductor.

• All the above.

The diagram shows the purification of copper. What are the correct labels for this experiment?

• A: Pure copper electrode

  B: Copper sulfate electrolyte

  C: Graphite electrode

• A: Impure copper electrode

  B: Copper sulfate electrolyte

  C: Graphite electrode

• A pure copper electrode,

  B copper sulfate electrolyte

  C impure copper electrode.

• A: Pure copper electrodeB: Sulphuric acid electrolyteC: Impure copper electrode

What are the three chemical effects of current?

• 1.Gas Bubbles may be formed at electrodes

  2. Metals may get deposited on electrodes

  3. Change of colour of the solution.

• 1.Heat produced at electrodes.

  2.Metals deposited on cathode.

  3.Evolution of smell.

• 1.Gas Bubbles may be formed on cathode.

  2. Metals may get deposited on electrolyte.

  3. Change of colour of the solution.

• None of the above.

Why is LED preferred to other type of bulbs?

• It is cheap.

• It works efficiently.

• it can glow even when weak or less current flows through it.

• it can glow even when high or more current flows through it.

Which one of the following solutions will not conduct electricity?

• Lemon juice

• Vinegar

• Tap water

• Vegetable oil