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Explanation:
A) Solid sodium chloride does not conduct electricity, because there are no electrons which are free to move. When it melts, sodium chloride undergoes electrolysis, which involves conduction of electricity because of the movement and discharge of the ions.
B) It is not safe to carry out electrical repairs outdoor during a downpour because rain water contains dissolved salts. Therefore, rainwater can conduct electricity. The electrician may get electrical shocks while working outdoors during rain.
C) To increase the conductivity of water a few drops of sulphuric acid is added . Being a strong acid it can ionize completely to release H+ ions. These H+ ions are responsible for the conduction of electricity. To carry out electrolysis in water,a few drops of sulphuric acid is added to the water.
D) Chromium is coated in kitchen gas burners because it prevents corrosion. The hardness of the gas burners is also increased by giving a coat of chromium or hard chrome plating them. Besides, they grow the aesthetic value and provide a shiny look. But the primary purpose is to prevent corrosion due to high heat.
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