MHT CET · Chemistry · p Block Elements (Group 15, 16, 17 & 18)
Which among the following P-block elements forms colourless and odourless hydride?
- A Oxygen
- B Nitrogen
- C Sulphur
- D Selenium
Answer & Solution
Correct Answer
(A) Oxygen
Step-by-step Solution
Detailed explanation
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.
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.
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