give reasons-
(a) non metals do not conduct electricity.
(b) metals displace hydrogen from acids
(c) gold and silver are used to make jewellery
Answers
Answer:
a. Metal atoms have outer electrons which are not tied to any one atom. These electrons can move freely within the structure of a metal when an electric current is applied. There are no such free electrons in covalent or ionic solids, so electronscan't flow through them - they are non-conductors.
b. Iron and aluminium will displace hydrogen from dilute acids as they more reactive then hydrogen. Mercury and copper cannot displace hydrogen from dilute acids as they are less reactive than hydrogen.
c. Gold and silver are used to make jewellery because they are precious and expensive metals. ... It is easier to obtain metals from their oxides rather than from carbonates or sulphides. So the ore is first converted into an oxide. A carbonate ore is first converted into oxide ore by calcination.
Explanation:
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