Available Answers

1. 1.

   Multiple-Choice Questions

   Tick (√) the correct option:

   1. A bad conductor of electricity is
      1. distilled water
      2. copper sulphate solution
      3. silver nitrate solution
      4. sulphuric acid solution
   2. The method to purify metals by passing electricity is called
      1. galvanisation
      2. electroplating
      3. electrorefining
      4. none of these
   3. When current is passed through acidulated water, the gases produced are:
      1. hydrogen gas
      2. hydrogen gas and oxygen gas
      3. oxygen gas and ozone gas
      4. oxygen gas and peroxide
   4. Which of the following is an electrolyte?
      1. Sugar
      2. Alcohol
      3. Sulphuric acid
      4. Kerosene
   5. The solution that conducts electricity is known as
      1. electrolyte solution
      2. non-electrolyte solution
      3. insulator
      4. none
   6. Anode is connected to the
      1. positive of battery
      2. negative of battery
      3. neutral battery
      4. none of these
   7. An ammeter is used for measuring
      1. potential difference
      2. resistance
      3. electric power
      4. electric current
   8. When current is passed through acidulated water, the volume ratio of hydrogen and oxygen gases is
      1. 2:1
      2. 1:1
      3. 2:3
      4. 1:4
   9. Which of the following is a non-electrolyte?
      1. copper sulphate
      2. sulphuric acid
      3. silver nitrate
      4. Alcohol
   10. Anion is
       1. positively charged
       2. negatively charged
       3. neutral
       4. None of these
2. 2.

   Fill in the blanks:

   1. Pure water can be made conducting by adding ___________ to it.
   2. A positively charged ion is called ___________.
   3. The container in which electrolysis is carried out is called ___________.
   4. The phenomenon of causing chemical changes by passing electric current is called ___________.
   5. During electrolysis, the object to be plated is made the ___________.
   6. Water mixed with salts is a ___________ conductor of electricity.
   7. The method of coating a metal with a layer of another metal using electric current is called ___________.
   8. Anions carry ___________ charge.
3. 3.

   Tick (√) the correct and cross (X) the wrong statement:

   1. Addition of table salt to water makes it a good conductor of electricity.
   2. Cheap imitation jewellery is made by electroplating.
   3. During electrolysis of water oxygen gas collects at the cathode.
   4. Glass is a good conductor.
   5. Tap water conducts electricity.
   6. Oxygen burns in air with a 'pop' sound.
   7. Petrol is a good conductor of electricity.
4. 4.

   Find the odd one out:

   1. Electroplating, electrolysis, hydrolysis, refining of metals.
   2. Salt water, tap water, copper sulphate solution, distilled water.
   3. Electrodes, cathode, anode, diode.
5. 5.

   Name the non-metal that is a good conductor of electricity.
6. 6.

   What is the name given to the positive electrode?