Mark the oxide which is amphoteric in character.

$X \xrightarrow{CoCl_2} CaCl_2 + Y \uparrow$; the effective ingredient of $X$ is

$P_4O_{10}$ has short and long $P-O$ bonds. The number of short $P-O$ bonds in this compound is

What is the value of $\angle S-S-S$ in the puckered $S_8$ ring of rhombic sulfur (in $^{\circ}$)?

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

$(Me)_2SiCl_2$ on condensation after hydrolysis will produce