Give reasons for the following:
(a) Solid sodium chloride does not conduct electricity while sodium chloride
solution conducts.
(b) It is not safe to carry out electrical repairs outdoors during a heavy
downpour.
(c) To carry out electrolysis of water, a few drops of sulphuric acid are
(carefully) added to the water.
(d) Kitchen gas burners are often coated with chromium.
Answers
Explanation:
a solid sodium chloride does not have mobile or free ions so it does not conduct electricity
b as there may be chances of getting current as impure water is conductor of electricity
c because it helps to ionise easily
d because it prevents corrosion
The reasons for the given statements are as follows :-
(a) Solid sodium chloride does not provide free ions, while its solution provides free ions. Hence, solid sodium chloride does not conduct electricity while it's solution conducts electricity.
(b) Rainwater often contains many dissolved salts in it. So, rainwater is a good conductor of electricity. Hence, carrying out electric repairs during a heavy downpour poses the risk of electric shock. So, it is not safe to carry out electric repairs during a heavy downpour.
(c) Adding a few drops of sulphuric acid makes the water more conducting. So, a few drops of sulphuric acid are added to water while carrying out electrolysis of water.
(d) The coat of chromium prevents corrosion of the gas burner. Hence, kitchen gas burners are often coated with chromium.