Which of the following statements is $NOT$ true for both white and red phosphorus?

Ammonia reacts with an excess of chlorine to form:

$Fe$ is made passive by

Small quantities of $NO$ and $HNO_3$ are formed as impurities when $N_2$ is prepared from $NH_4Cl_{(aq)}$ and $NaNO_{2(aq)}$. These impurities can be removed by passing the $N_2$ gas through which of the following?

Which of the following statements is not true for nitrogen?

Which among the following is non-poisonous in nature?