3. Give reasons why:
(a) gold is found in free state but iron is not.
(b) sodium reacts with cold water, whereas iron does not.
(c) copper cannot replace iron from its salt solution.
(d) copper is used for making electrical wires while silver is not.
(e) cooking utensils are made of metals whereas their handles are wooden.
(f) sodium is stored in kerosene.
(g) white phosphorous is stored under water.
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Explanation:
a) Gold, along with Ag and Cu, is called as noble metal as it is very less reactive under normal conditions. Iron is readily reactive with water and O2.
b). sry ,no perfect answer from me.
c) Copper is less reactive than Iron .Hence it can't replace iron from its salt.
d) Although silver is better conductor, copper is considered for making wires as it is ideal due to its low cost and other reasons.
e)Metals Conduct heat quickly and efficiently which is required for cooking. But we have to hold the utensils with handles, and obviously should not Conduct heat. hence wooden made.
f) Na is Highly reactive with Water and also with air(O2). hence stored in closed containers with kerosene.
g),no idea sry
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