Give reason: (i) Rusting of iron pipe can be prevented by joining it with a piece of magnesium. (ii) Conductivity of an electrolyte solution decreases with the decrease in concentration.

Give reason: (i) Rusting of iron pipe can be prevented by joining it w

1.	Give reason: (i) Rusting of iron pipe can be prevented by joining it with a piece of magnesium. (ii) Conductivity of an electrolyte solution decreases with the decrease in concentration.
Answer» (i) it is due to cathodic protection in which magnesium metal is oxidized in preference to iron and acts as the anode. (ii) It is due to the fact that on dilution, number of ions per unit volume decreases.

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Define molar conductivity of a solution and explain how molar conductivity changes with change in concentration of a solution for a weak and a strong electrolyte.
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What are elementary reactions ?

Give reason: (i) Rusting of iron pipe can be prevented by joining it with a piece of magnesium. (ii) Conductivity of an electrolyte solution decreases with the decrease in concentration.

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