Sulphur, Nitrogen, halogen, inert Gases (Non-metals)

Total Questions: 38

1. Which gas is known as 'noble gas'? [M.P. P.C.S. (Pre) 2016]

Correct Answer: (c) Helium
Solution:The noble gases make a group of chemical elements with similar properties under standard conditions. They are all odourless, colourless, monatomic gases with very low chemical reactivity. These gases do not undergo chemical reactions under certain given conditions. The six noble gases that occur naturally are Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), and the radioactive Radon (Rn).

2. Which of the following elements is not a Noble gas? [U.P. P.C.S. (Pre) 2023]

Correct Answer: (c) Actinium
Solution:Argon, Krypton, and Radon are all noble gases. Actinium (Ac) is a radioactive metallic element and belongs to the actinide series.

3. Percentage amount (by volume) of which one of the following gas is lowest in the atmosphere? [R.A.S./R.T.S. (Pre) 2007]

Correct Answer: (b) Carbon dioxide
Solution:The atmosphere contains many gases in small amounts. The most abundant gas is nitrogen (about 78%), followed by oxygen (about 20.95%), and argon (about 0.93%). Carbon dioxide makes up only about 0.03% of the atmosphere.

4. What is the approximate percentage of Nitrogen present in the atmosphere? [M.P.P.C.S. (Pre) 2006]

Correct Answer: (d) 78-79%
Solution:The atmosphere contains many gases in small amounts. The most abundant gas is nitrogen (about 78%), followed by oxygen (about 20.95%), and argon (about 0.93%). Carbon dioxide makes up only about 0.03% of the atmosphere.

5. Which gas is not in the gaseous cycle? [Chhattisgarh P.C.S. (Pre) 2014]

Correct Answer: (d) H₂
Solution:Biogeochemical cycles can be classified as gaseous or sedimentary. Gaseous cycles include nitrogen, oxygen, carbon, and water, while sedimentary cycles involve elements such as iron, calcium, phosphorus, and sulfur.

6. Which of the following pair of gases is used for the respiratory activities of divers? [U.P. R.O./A.R.O. (Mains) 2016 ,U.P. P.C.S. (Mains) 2014]

Correct Answer: (a) Oxygen and Helium
Solution:Deep sea divers use a mixture of oxygen and helium because helium generates less airway resistance than air and is less soluble in water than nitrogen, making it safer under pressure.

7. Which gas is mixed with Oxygen for respiration by divers in deep sea? [R.A.S./R.T.S. (Pre) 2007]

Correct Answer: (a) Helium
Solution:Deep sea divers use a mixture of oxygen and helium because helium generates less airway resistance than air and is less soluble in water than nitrogen, making it safer under pressure.

8. What is the shape of sulphur hexafluoride molecule? [43rd B.P.S.C. (Pre) 1999]

Correct Answer: (b) Octahedral
Solution:Sulphur hexafluoride (SF₆) is a molecule with an octahedral shape, consisting of six fluorine atoms attached to a central sulfur atom.

9. Which one of the following mixture of gas is used by the deep sea divers? [U.P. Lower Sub. (Pre) 2004]

Correct Answer: (a) Mixture of Helium-Oxygen
Solution:Deep sea divers use a mixture of oxygen and helium because helium generates less airway resistance than air and is less soluble in water than nitrogen, making it safer under pressure.

10. Easily soluble in water — [U.P.P.C.S. (Pre) 1993]

Correct Answer: (c) Ammonia
Solution:Ammonia, being a polar molecule, dissolves readily in water because both ammonia and water are capable of forming hydrogen bonds.

Carbon (in its elemental forms like graphite or diamond) is insoluble in water.

Nitrogen  is sparingly soluble in water.

Iodine has very low solubility in water.