Chemical Effects of Electric Current

Q.

What is capacitor and its uses?

Q.

What devices use AC current?

Q.

(a) What is meant by the chemical effect of electric current ? Explain with the help of an example.
(b) Name any two applications of the chemical effect of electric current.
(c) What is electrolysis ? Explain why, in the electrolysis of water, 'acidified water' is used.

Q.

During electrolysis, the reaction that takes place at the cathode is _____

1. Oxidation

2. Reduction

3. Decomposition

4. Redox

Q.

When electric current is passed through acidified water, then hydrogen and oxygen are formed. What type of effect of current is illustrated by this statement ?

Q.

If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the positive terminal of the battery.

1. True

2. False

Q.

In the electrolysis of dilute ${\mathrm{H}}_2{\mathrm{SO}}_4$ what is liberated at the anode?

Q. Which of the following can act as an electrolyte?

1. Oil
2. Soap solution
3. Alcohol
4. Saltwater

Q.

The passage of an electric current through a solution causes ________ effects.

Q.

How does electric current flow in a metal?

Q.

Which effect of current is responsible for electrolysis of salt solution?

1. All of these

2. Magnetic effect of electric current

3. Heating effect of electric current

4. Chemical effect of electric current

Q.

Question 1 (b)
Fill in the blank.
The passage of an electric current through a solution causes _______effects.

Q.

The liquid that conducts electricity in the liquid state and breaks up chemically is called an electrolyte.

1. True
2. False

Q.

When an electric current is passed through a cut potato for a considerable time, a coloured spot is formed around one of the electrodes :
(a) What is the colour of the spot?
(b) Around which electrode (positive or negative electrode) the coloured spot is formed?
(c) Which effect of electric current is involved in this case?

Q.

What should be done to decompose water into hydrogen and oxygen ?

Q.

Name the gases used in Miller and Ureys experiment?

Q.

6. Formation of rust on iron nail is a ________ change.

Q.

What happens when an inductor is fully charged?

Q.

(a) Name three types of substances in which an electric current can produce a chemical effect.
(b) State some of the characteristics of chemical changes brought about by the chemical effect of electric current.
(c) Why does an electric bulb glow when a current passes through it ?

Q.

What happens when a living organism dies?

Q.

When an electric current is passed through a solution containing copper sulphate, copper gets deposited on which electrode?

1. Either positive or negative electrode depending on the concentration of the solution

2. Electrode which is connected to the negative terminal of the battery

3. Equally on both the electrodes

4. Electrode which is connected to the positive terminal of the battery

Q.

Can ${\mathrm{H}}_2\mathrm{O}$ be broken down?

Q.

Which of the following effects is not produced by the chemical reactions brought about by an electric current ?
(a) bubbles of gases on electrodes
(b) deposits of metals on electrodes
(c) change in colour of solution
(d) formation of a precipitate

Q. 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,

1. P must be connected to R and Q to S.
2. P must be connected to Q and S to R.
   
3. P must be connected to S and Q to R.
4. P and Q must be connected to R.
   

Q.

Which of the following compounds is manufactured by using the chemical effect of electric current ?
(a) ammonium hydroxide
(b) sodium carbonate
(c) magnesium hydroxide
(d) sodium hydroxide

Q. Due to chemical effect of electric current, substances can be split or combined at the molecular level.

1. True
2. False

Q.

Name two metals which are produced (or extracted) by using the chemical effect of electric current.

Q.

What chemicals are used in a Lithium ion battery?

Q.

Pure water is used for electrolysis of water to get hydrogen.

1. True
2. False

Q.

What happens when the temperature of a solution of a weak electrolyte increases?