Which among the following P-block elements forms colourless and odourless hydride?
Which among the following P-block elements forms colourless and odourless hydride?
Oxygen
Nitrogen
Sulphur
Selenium
Solution
Oxygen: Its hydride is water $\left(\mathrm{H}_2 \mathrm{O}\right)$, which is a colorless, odorless liquid.
Nitrogen: Its hydride is ammonia $\left(\mathrm{NH}_3\right)$, which is colorless but has a strong, pungent odor.
Sulphur: Its hydride is hydrogen sulfide $\left(\mathrm{H}_2 \mathrm{~S}\right)$, which is colorless but has a distinct, rotten-egg smell.
Selenium: Its hydride is hydrogen selenide $\left(\mathrm{H}_2 \mathrm{Se}\right)$, which has an extremely unpleasant odor.
Only oxygen forms a hydride (water) that is both colorless and odorless.