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a)answer in the pic
and for second one answer is
1) the reactivity of an alloy is much higher than of a pure metal,and
2) an alloy does not undergo oxidation ( or burn) easily even at high temperature, when it is red hot.
c) answer is
tungsten is used almost exclusively for making the filament of electric lamps because it has very high melting point due to which tungsten filament can be kept white-hot without melting away. moreover,tungsten has high flexibility and low rate of evaporation at high temperature.
Hope it will help you.
and for second one answer is
1) the reactivity of an alloy is much higher than of a pure metal,and
2) an alloy does not undergo oxidation ( or burn) easily even at high temperature, when it is red hot.
c) answer is
tungsten is used almost exclusively for making the filament of electric lamps because it has very high melting point due to which tungsten filament can be kept white-hot without melting away. moreover,tungsten has high flexibility and low rate of evaporation at high temperature.
Hope it will help you.
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