Which of the following is used widely in the manufacture of lead storage battery?

The three important oxidation states of phosphorus are

In group $15$ of the periodic table,nitrogen forms only a trihalide,but other elements form pentahalides also. The reason is:

White phosphorus catches fire in air to produce dense white fumes. This is due to the formation of

In the following reaction,identify the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T$:
$\underline{P}Cl_3 + H_2O \longrightarrow H_3PO_3 + HCl$

The element which forms oxides in all oxidation states from $+I$ to $+V$ is