Give reasons:
a) Aqueous solution of NaCl conducts electricity whereas solid NaCl does not.
b) Metals like sodium, potassium and lithium are stored under kerosene oil.
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Explanation:
(A) In its solid state, sodium chloride (like
many other ionic compounds) have fixed ions. This therefore means that the ions cannot move freely, a condition for the conduction of electricity. However, when it is in its molten state, the ions are free to move around, thus making them free to conduct electricity.
(B) Sodium, potassium, and lithium are stored under oil because metals like sodium and potassium react so, vigorously that they catch fire if kept in the open. Hence, to protect them they are kept immersed in kerosene oil.
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