Which of the following elements exhibit metallic nature among $C$,$Si$,$Ge$,$Sn$,and $Pb$?
- A$Ge, Pb$
- B$Ge, Sn$
- C$C, Ge$
- D$Sn, Pb$
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$(2)$ $CO$ is neutral while $CO_2$ is acidic.
$(3)$ Boron fibres are used in making light composite material for aircraft.
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