When $MnO_2$ and $H_2SO_4$ are added to a salt $(A)$,the greenish yellow gas liberated indicates that salt $(A)$ is:

Which of the following elements forms a molecule consisting of eight of its own atoms?

Which of the following compounds is $NOT$ acidic in nature?

Carbon and silicon belong to group $IV$. The maximum coordination number of carbon in commonly occurring compounds is $4$,whereas that of silicon is $6$. This is due to

Which of the following elements exhibit metallic nature among $C$,$Si$,$Ge$,$Sn$,and $Pb$?

Which of the following elements exists in the solid state at $25\,^oC$ temperature and atmospheric pressure?