What happens when iron is treated with concentrated nitric acid $(HNO_3)$?

$A$ hydride of nitrogen which is acidic is

Which of the following reactions correctly represent the products formed upon heating?
$(a) \ NH_4NO_2 \xrightarrow{\Delta } N_2 + 2H_2O$
$(b) \ NH_4NO_3 \xrightarrow{\Delta } N_2O + 2H_2O$
$(c) \ Na_2CO_3 \xrightarrow{\Delta } Na_2O + CO_2$
$(d) \ NH_4Cl \xrightarrow{\Delta } NH_3 + HCl$

Match the reactions (in the given stoichiometry of the reactants) in List-$I$ with one of their products given in List-$II$ and choose the correct option.

List-$I$	List-$II$
$A. P_2 O_3 + 3 H_2 O \rightarrow$	$1. P(O)(OCH_3)Cl_2$
$B. P_4 + 3 NaOH + 3 H_2 O \rightarrow$	$2. H_3 PO_3$
$C. PCl_5 + CH_3 COOH \rightarrow$	$3. PH_3$
$D. H_3 PO_2 + 2 H_2 O + 4 AgNO_3 \rightarrow$	$4. CH_3 COCl$
	$5. H_3 PO_4$

Which of the following statements is wrong?

How many bridging oxygen atoms are present in $P_4O_{10}$?