In $C_{60}$,all carbon atoms are .......

Deep sea divers use a mixture of ....... for respiration.

The silicate anion in the mineral kinoite is a chain of three $SiO_4$ tetrahedra that share corners with adjacent tetrahedra. The mineral also contains $Ca^{2+}$ ions,$Cu^{2+}$ ions,and water molecules in a $1 : 1 : 1$ ratio. The mineral is represented as:

Identify the element whose monoxide and dioxide are acidic in nature.

In the following reaction,identify the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T.$:
$\underline{P}_4O_{10} + H_2O \longrightarrow H_3PO_4$

In $P_4O_{10}$,the number of oxygen atoms attached to each phosphorus atom is