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Chemical Effects of Electric Current (Class VIII)

Chemical Effects of Electric Current

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Which of the following are strong electrolytes?

a. Acetic acid solution
b. Carbonic acid solution
c. Nitric acid solution
d. Potassium hydroxide solution

  1. Only a and b
  2. Only a and c
  3. Only a and d
  4. Only b and c
  5. Only c and d
Question 2 Multiple Choice (Single Answer)

Which of the following solutions are non-electrolytes?

a. Glucose solution
b. Vinegar solution
c. Alcohol solution
d. Common salt solution

  1. Only a and b
  2. Only a and c
  3. Only a and d
  4. Only b and c
  5. Only b and d
Question 3 Multiple Choice (Single Answer)

Which of the following cannot be added to distilled water to make it a good conductor of electricity?

  1. Dilute sulphuric acid
  2. Sodium hydroxide
  3. Lemon juice
  4. Vinegar
  5. Vegetable oil
Question 4 Multiple Choice (Single Answer)

In which of the following ways can the weak electric current flowing through liquids, having low conductivity, be detected?

a. By using a torch bulb
b. By using an LED
c. By using a compass surrounded by turns of circuit wire

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only a and c
Question 5 Multiple Choice (Single Answer)

When electric current is passed through acidified water by using carbon electrodes, then a chemical reaction takes place to form

  1. hydrogen gas and carbon dioxide gas
  2. hydrogen gas and nitrogen gas
  3. oxygen gas and carbon dioxide gas
  4. hydrogen gas and oxygen gas
  5. carbon dioxide gas and nitrogen gas
Question 6 Multiple Choice (Single Answer)

Which of the following statements is/are false?

a. Caustic soda is produced by the electrolysis of an aqueous solution of potassium chloride.
b. If we take ordinary water in a beaker and pass electricity through it, then the torch bulb will not glow at all even if a large battery is applied.
c. A solution of sodium hydroxide or potassium hydroxide in water conducts electricity.

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only c
Question 7 Multiple Choice (Single Answer)

Which of the following gases is formed at the anode, which is connected to the positive terminal of the battery when electric current is passed through acidified water?

  1. Hydrogen
  2. Nitrogen
  3. Oxygen
  4. Argon
  5. Helium
Question 8 Multiple Choice (Single Answer)

When an electric current flows through a conducting solution, it causes a chemical change. The chemical reactions brought about by an electric current will not produce which of the following effects?

a. Change in colour of solution may occur.
b. Deposits of metal will be formed on the sides of the container.
c. Bubbles of a gas or gases may be formed on the electrodes.

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only c
Question 9 Multiple Choice (Single Answer)

Which of the following statements is/are incorrect regarding electroplating of an iron object with copper metal?

a. A copper plate is made the positive electrode.
b. The iron object, which is to be electroplated, is made the negative electrode.
c. Iron sulphate solution is taken as an electrolyte.

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only c
Question 10 Multiple Choice (Single Answer)

The chemical effect of electric current is not used in the industry for which of the following purposes?

  1. Decomposing chemical compounds
  2. Production of chemical compounds
  3. Purification of metals
  4. Separation of certain metals from the ores
  5. Electroplating metals
Question 11 Multiple Choice (Single Answer)

Which of the following statements is/are false?

a. The chemical decomposition produced by passing an electric current through a conducting liquid is called electrolysis.
b. Due to the presence of small amounts of carbonic acid and nitric acid in the rainwater, it becomes a conductor of electricity.
c. Drinking water is a much better conductor of electricity than sea water.

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only c
Question 12 Multiple Choice (Single Answer)

Electroplating is done to protect something from corrosion and for decorative purposes. Which of the following metals cannot be used for electroplating?

  1. Nickel
  2. Chromium
  3. Iron
  4. Copper
  5. Tin
Question 13 Multiple Choice (Single Answer)

Which of the following cannot be produced by passing electric current through its compounds in molten state?

  1. Magnesium
  2. Calcium
  3. Sodium
  4. Aluminium
  5. Platinum
Question 14 Multiple Choice (Single Answer)

Match the following:

 
a. Electrolyte 1. It is the negatively charged electrode.
b. Anode 2. It is a liquid that can conduct electricity.
c. Cathode 3. It is the positively charged electrode.
  1. a - 2, b - 3, c - 1
  2. a - 2, b - 1, c - 3
  3. a - 1, b - 2, c - 3
  4. a - 3, b - 2, c - 1
  5. a - 1, b - 3, c - 2
Question 15 Multiple Choice (Single Answer)

Which of the following statements is/are false?

a. A solution of hydrochloric acid or sulphuric acid in water conducts electricity.
b. Vinegar does not conduct electricity as it is a solution of acid.
c. An arrangement having two electrodes kept in a conducting liquid in a vessel is called an electrolytic cell.

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only c
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