Properties of Compounds of Nitrogen

In the reaction of phosphorous with conc. ${\mathrm{HNO}}_3$, the oxidized and reduced products respectively are

In the detection of the nitrate ion, a brown complex in the form of a brown ring is formed at the junction of the two liquids. How many unpaired electrons does this brown complex contain?

Concentrated nitric acid turns the colour of the skin into-

The brown ring test for nitrates depends upon

When ${\mathrm{PbO}}_2$ reacts with concentrated ${\mathrm{HNO}}_3$, the gas evolved is

Identify the reaction which does not liberate ${\mathrm{N}}_2$

When the copper metal is treated with a cold and dilute nitric acid, it forms

A metal $\mathrm{M}$ can give the following observable change in a sequence of reactions.

$\mathrm{M}\underset{{\mathrm{HNO}}_3}{\overset{\mathrm{diluted}}{\to }}\mathrm{colourless} solution\underset{\mathrm{NaOH}}{\overset{\mathrm{aq}}{\to }}\mathrm{white} \mathrm{ppt}.\underset{\mathrm{NaOH}}{\overset{\mathrm{excess}}{\to }}\mathrm{colourless} solution\stackrel{{\mathrm{H}}_2\mathrm{S}}{\to }\mathrm{white} \mathrm{ppt}.$

The metal $\mathrm{M}$ is :

Reaction of ${\mathrm{HNO}}_3$ with $\mathrm{I}, \mathrm{S}, \mathrm{P}$ and $\mathrm{C}$ gives respectively:

Both $\mathrm{Be}$ and $\mathrm{Al}$ become passive on reaction with conc. nitric acid due to :

Which of the following salt will not give positive brown ring test?

$\mathrm{KCl}+\mathrm{Conc}.{\mathrm{H}}_2{\mathrm{SO}}_4+{\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7\stackrel{\mathrm{\Delta }}{⟶}\mathrm{X}\stackrel{\mathrm{NaOH}}{⟶}\mathrm{Y}$

$\left(\mathrm{X}\right)$ is reddish brown coloured gas soluble in $\mathrm{NaOH}$ forming $\left(\mathrm{Y}\right). \left(\mathrm{X}\right)$ and $\left(\mathrm{Y}\right)$ are :-

When zinc reacts with very dilute ${\mathrm{HNO}}_3$, the oxidation state of nitrogen changes from :-

Which of the following reaction is incorrectly written ?

When copper is heated with conc.${\mathrm{HNO}}_3$ it produces ?

Which of the following is correct about ammonia?

When copper is heated with conc. ${\mathrm{HNO}}_3$ it produces
 

${\mathrm{NH}}_3+\mathrm{NaOCI}\stackrel{\mathrm{getatin} \mathrm{or} \mathrm{EDTA}}{\to }\mathrm{product}$

The number of moles of $\mathrm{N}-\mathrm{H}$ bond present in one mole of the strongest nucleophile present in the product is :

A solution of ammonia in water contains which of the following species:

Which of the following ions dissolve in excess of aqueous ${\mathrm{NH}}_3$.