p Block Elements (Group 15, 16, 17 & 18)

Assertion : Pure $\mathrm{N}_2$ is obtained from $\mathrm{Ba}\left(\mathrm{N}_3\right)_2$ but not from $\left(\mathrm{NH}_4\right)_2 \mathrm{Cr}_2 \mathrm{O}_7$. Reason : On decomposition, $\left(\mathrm{NH}_4\right)_2…

How is ammonia generally manufactured in large scale?

Yellow colour of chlorine water fades because

Strong oxidising agent used in purification of water is

Which will release $\mathrm{NH}_3$ on reaction with $\mathrm{NaOH}$ ?

Which of the following reacts most slowly with nitric acid?

Assertion : Red phosphorus on heating changes its colour into black. Reason : Black phosphorus contains $\mathrm{P}_4$ units.

Assertion : Brown ring test is not valid for $\mathrm{Fe}^{+3}$ ion. Reason : Because $\mathrm{NO}_3^{-}$ion first gets converted into $\mathrm{NO}_2^{-}$ion.

Assertion : Pure $\mathrm{N}_2$ is formed from $\mathrm{Ba}\left(\mathrm{N}_3\right)_2$. Reason : Thermal decomposition of $\mathrm{NaN}_3$ is used to inflate the air bags used for safety devices in some cars.

Which of the following contains atleast one lone pair in all of its halides?

Assertion : $\mathrm{O}_2 \mathrm{~F}_2$ converts $\mathrm{Pu}$ to $\mathrm{PuF}_6$. Reason : $\mathrm{O}_2 \mathrm{~F}_2$ is used to remove unreacted $\mathrm{Pu}$ from nuclear reaction.

Assertion : $\mathrm{O}_3$ has higher boiling point than $\mathrm{O}_2$. Reason : $\mathrm{O}_3$ is allotrope of oxygen.