The passivity of iron in concentrated nitric acid is due to

Match $List-I$ with $List-II$,match the gas evolved during each reaction.

$List-I$	$List-II$
$A$. $(NH_4)_2Cr_2O_7 \xrightarrow{\Delta}$	$I$. $H_2$
$B$. $KMnO_4 + HCl \rightarrow$	$II$. $N_2$
$C$. $Al + NaOH + H_2O \rightarrow$	$III$. $O_2$
$D$. $NaNO_3 \xrightarrow{\Delta}$	$IV$. $Cl_2$

Choose the correct answer from the options given below.

Identify the $INCORRECT$ statement$(s)$ among the following:
$(I)$ Moist ammonia gas can be dried by using anhydrous $CaCl_2$
$(II)$ Phosphine is a weaker base than ammonia
$(III)$ $R_3SiCl$ produces very complex cross-linked polymeric silicone on hydrolysis
$(IV)$ When metallic copper reacts with $6 \ M$ $HNO_3$,$NO_2$ is the only product

When $NH_3$ is passed over heated $CuO$,what is it oxidized to?

Which of the following hydrides of nitrogen is most acidic in nature?

Nitric oxide $(NO)$ is prepared by the action of dilute $HNO_3$ on which of the following metals?