Concentrated nitric acid is allowed to act on various substances. Select the correct statement(s).

AIron becomes passive and does not dissolve.
BWhite phosphorus is oxidised to $H X_{3} PO X_{4}$ with evolution of $NO X_{2}$ .
CSulphur is oxidised to $H X_{2} SO X_{4}$ with evolution of $NO X_{2}$ .
DCopper reacts to give $Cu (NO X_{3}) X_{2}$ and mainly $NO$ .

Answer: A, B, C

Conc.

HNO X_{3}

oxidises

P X_{4}

H X_{3} PO X_{4}

and

S X_{8}

H X_{2} SO X_{4}

, itself reduced to

NO X_{2}

. With copper, conc. acid gives

NO X_{2}

(the product is

NO

only with dilute acid). Iron is rendered passive by a protective oxide layer in conc. acid.