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pure copper
an alloy of copper
an ore of copper
impure copper
Bohr model can explain about
Bohrs theory of fixed orbits contradicts
Brass gets discolored in air because of the presence of which of the following gases in air?
Brass gets discoloured in air due to constant exposure in presence of:
Bronze is an alloy of
Cadmium rods are used in a nuclear reactor
Calcium salts used as fertilizer is:
Candle is a mixture of
Carbon dioxide is
Cement containing excess amount of lime