The main products formed when copper metal is reacted with concentrated $HNO_3$ are

The incorrect order is

The following are some statements related to $VA$ group hydrides:
$I$. Reducing property increases from $NH_3$ to $BiH_3$.
$II$. Tendency to donate lone pair decreases from $NH_3$ to $BiH_3$.
$III$. Thermal stability of hydrides decreases from $NH_3$ to $BiH_3$.
$IV$. Bond angle of hydrides decreases from $NH_3$ to $BiH_3$.
The correct statements are:

Nitrous oxide is known as

In which of the following does aluminum become passive?

The incorrect statement regarding $15^{th}$ group hydrides $(EH_3)$ where $E = N, P, As, Sb, Bi$ is: