Which of the following is a good conductor of heat and electricity?

Manmade silicate is $........$
$........$ is used to convert alcohols directly into gasoline. Give the use of hydrated zeolites.

$(BN)_n$ exists in

For correct statement use $T$ and for incorrect use $F$:
$(A)$ Hydrolysis of Marshall's acid gives $H_2SO_4$ and $H_2O_2$ as final products.
$(B)$ In $SCNSiH_3$ structure,the geometry around $N$ is bent.
$(C)$ The basic unit for silicates is $SiO_4^{4-}$.
$(D)$ $NH_4Cl + NaOH \to NH_3 \uparrow$.

Among the following nitrates,Lead nitrate,Silver nitrate,and Ammonium nitrate; the one that decomposes without leaving any solid residue is

An oxide of an element is a gas and dissolves in water to give an acidic solution. The element belongs to: