Important Compounds of Group 15 Elements

${\mathrm{N}}_2{\mathrm{O}}_5$ is heated in presence of sodium to produce a solid and a gaseous product. Hybridization of central atom of anion in the solid product is-

Which of the following statements do not leave any residue on heating?

${\mathrm{NH}}_3$ reacts with a gas fumes produced when methanol is passed through $\mathrm{Cu}$ tube at $573 \mathrm{K}$. The compound obtained is polycyclic. No of rings it contain $=\left[\mathrm{X}\right]$. i.e., if it is monocyclic then $X=1$, of bicyclic $\mathrm{X}=2$ or $\mathrm{X}$ cyclic. The number of Nitrogen atoms it has $=\left[\mathrm{Y}\right]$. Find values of $\mathrm{X} \& \mathrm{Y}$ & Report your answer as $\mathrm{X} + \mathrm{Y}$.

Which of the following leaves no residue on heating ?

Of the following, which has three electron bond in its structure?

An inorganic salt $\left(\mathrm{A}\right)$ is decomposed at about $523 \mathrm{K}$ to give products $\left(\mathrm{B}\right)$ and $\left(\mathrm{C}\right)$. compound $\left(\mathrm{C}\right)$ is a liquid at room temperature and is neutral to litmus paper while oxide $\left(\mathrm{B}\right)$ on burning with white phosphorous, given a dehydrating agent $\left(\mathrm{D}\right)$. compounds $\left(\mathrm{A}\right), \left(\mathrm{B}\right), \left(\mathrm{C}\right)$ and $\left(\mathrm{D}\right)$ will be identified as -

${\mathrm{HNO}}_3+{\mathrm{P}}_4{\mathrm{O}}_{10}⟶{\mathrm{HPO}}_3+\mathrm{A};$ The product $\mathrm{A}$ is -

$\mathrm{Ca}+{\mathrm{C}}_2\to \mathrm{Ca}{\mathrm{C}}_2\stackrel{{\mathrm{N}}_2}{\to }\mathrm{A}$; Compound $\left(\mathrm{A}\right)$ is used as $\mathrm{a}/\mathrm{an}$ -

Three allotropes $\left(\mathrm{A}\right), \left(\mathrm{B}\right)$ and $\left(\mathrm{C}\right)$ of phosphorous in the following change are respectively -

The number of molecules of water needed to convert one molecule of ${\mathrm{P}}_2{\mathrm{O}}_5$ into Ortho phosphoric acid is:

In a cyclotrimetaphosphoric acid molecule, how many single and double bonds are present?

Which of the following is correct for ${\mathrm{P}}_4$ molecule of white phosphorus?