State reasons for the following: (a) Carbon cannot reduce the oxides of sodium and aluminium. (b) Calcium does not occur free in nature. (c) Zinc does not give hydrogen on reacting HNO3. (d) Metals can be given different shapes according to our needs. (e) Gold and Platinum are used in jewelry.
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a) In electro positive serise sodium and lithium stays above so, it cannot reduces the oxides of Na,Al
b) it reacts vigorously with other elements
c) because HNO3 is itself an strong redusing agent
d) because they have propeties of maliability and ductility
e) because of lusterous and inert in nature
b) it reacts vigorously with other elements
c) because HNO3 is itself an strong redusing agent
d) because they have propeties of maliability and ductility
e) because of lusterous and inert in nature
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