The gas which turns lime water milky is:

The element $X$ on reaction with conc. $HNO_3$ forms two acidic oxides $A$ and $B$ of different shapes. Element $Z$ on reaction with conc. $H_2SO_4$ forms two acidic oxides $A$ and $D$ of different shapes. What are $X$ and $Z$?

The formation of $Al_2O_3$ involves the evolution of a large quantity of heat,which makes its use in:

Consider the following statements:
$(a)$ $R_2SiO$ is the repeating unit of linear silicones.
$(b)$ $RSiCl_3$ on hydrolysis followed by dehydration gives linear silicones.
$(c)$ Silicones can be used as heat insulators.
$(d)$ Silica is soluble in $HF$.
The correct statement$(s)$ is/are:

Explain zeolite compounds.

The hydride of phosphorus,$PH_3$,is ...