(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.
(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.
a)When electric current is passed through a conducting solution, some chemical reaction takes place. The resulting effects are called chemical effects of electric current.
Examples:
(i) When electric current is passed through water, water dissociates into hydrogen and oxygen.
ii) When electric current is passed through the solution of a metal salt, such as solution of copper sulphate, metal gets deposited at the negative electrode, because metal is positively charged.
(iii) Sometimes, the colour of solution also changes when electric current passes through it.
b)
i) Electroplating.
(ii) Refining of impure metals.
iii) Refining of metal are for obtaining pure metal.
c)Electrolysis is a chemical decomposition produced by passing an electric current through a liquid or solution containing ions.
Pure water or distilled water is a poor electrical conductor because there are few ions in it.
For Electrolysis process freely flowing ion is required for passing current.
Water acidified with sulfuric acid contains H+ ions, water molecules and
sulfate ions. In the electrolysis of acidified water
a)When electric current is passed through a conducting solution, some chemical reaction takes place. The resulting effects are called chemical effects of electric current.
Examples:
(i) When electric current is passed through water, water dissociates into hydrogen and oxygen.
ii) When electric current is passed through the solution of a metal salt, such as solution of copper sulphate, metal gets deposited at the negative electrode, because metal is positively charged.
(iii) Sometimes, the colour of solution also changes when electric current passes through it.
b)
i) Electroplating.
(ii) Refining of impure metals.
iii) Refining of metal are for obtaining pure metal.
c)Electrolysis is a chemical decomposition produced by passing an electric current through a liquid or solution containing ions.
Pure water or distilled water is a poor electrical conductor because there are few ions in it.
For Electrolysis process freely flowing ion is required for passing current.
Water acidified with sulfuric acid contains H+ ions, water molecules and
sulfate ions. In the electrolysis of acidified water
