Pentavalency in phosphorus is more stable when compared to that of nitrogen,even though they belong to the same group. This is due to:

Which of the following is the incorrect order?

Ammonia reacts with an excess of chlorine to form:

In which of the following ranges can nitrogen exhibit various oxidation states?

Identify the correct order$(s)$ among the following:
$a. NH_3 > PH_3 > AsH_3$ (Thermal stability)
$b. NH_3 < PH_3 < AsH_3$ (Reducing power)
$c. NI_3 > NBr_3 > NCl_3$ (Lewis basic character)
$d. N_2O_5 > P_2O_5 > As_2O_5$ (Acidic character)
Select the correct option:

Given below are two statements $:$
Statement $I :$ Nitrogen forms oxides with $+1$ to $+5$ oxidation states due to the formation of $p\pi-p\pi$ bond with oxygen.
Statement $II :$ Nitrogen does not form halides with $+5$ oxidation state due to the absence of $d$-orbital in it.
In the light of given statements,choose the correct answer from the options given below.