NON-MEATALS, C . Sulphur, Nitrogen, halogen, inert Gases

21. In order to compensate the deficiency of which of the following elements, the insectivorous plants trap and eat insects? [U.P.R.O./A.R.O. (Mains) 2013]

(a) Manganese
(b) Nitrogen
(c) Magnesium
(d) Sulphur

Correct Answer: (b) Nitrogen

Solution:Carnivorous or insectivorous plant can trap and digest insects and other small animals. They do this to obtain vital nitrogen that they need to grow. Most of the plants absorb enough nitrogen from nitrates in the soil.

22. The soil in which insectivorous plants grow is deficient in: [U.P. P.C.S. (Mains) 2016]

(a) Magnesium
(b) Calcium
(c) Nitrogen
(d) Water

Correct Answer: (c) Nitrogen

Solution:Insectivorous plants cannot get nitrogen from the soil as they grow in waterlogged soils deficient in nitrogenous compounds. They obtain nitrogen from small insects. Examples of insectivorous plants include Nepenthes, Dionea, Drosera, and Utricularia.

23. Which gas is usually filled in the balloon? [M.P. P.C.S. (Pre) 1991]

(a) Hydrogen
(d) Helium
(b) Oxygen
(c) Carbon dioxide

Correct Answer: (d) Helium

Solution:A gas balloon flies in the air because it is filled with helium, which is lighter than air. Helium is inert in nature and does not form an explosive mixture with air.

24. Helium is preferred to Hydrogen in air balloons because it — [U.P.P.C.S. (Pre) 2011]

(a) Is cheaper
(b) Is less dense
(c) Has greater lifting power
(d) Does not form an explosive mixture with air

Correct Answer: (d) Does not form an explosive mixture with air

Solution:Helium is preferred over hydrogen in air balloons because it is inert in nature. Also, hydrogen is highly flammable and explosive so it would make it unsafe to use in balloons

25. Tear gas is: [Uttarakhand P.C.S. (Pre) 2007]

(a) Ammonia
(b) Chlorine
(c) Hydrogen Carbide
(d) Hydrogen Sulphide

Correct Answer: (b) Chlorine

Solution:Tear gas is a chemical weapon that causes severe eye and respiratory pain, skin burning, vomiting, and even blindness. It stimulates the nerves of the lacrimal gland to produce tears. Chlorine (Cl₂) is commonly used in tear gas.

26. Which of the following gas is used as tear gas? [43rd B.P.S.C. (Pre) 1999]

(a) $H_2$
(b) $SO_2$
(c) $NH_3$
(d) $Cl_2$

Correct Answer: (d)

Solution:Tear gas is a chemical weapon that causes severe eye and respiratory pain, skin burning, vomiting and even blindness. In the eye, it stimulates the nerves of the lacrimal gland to produce tears. It is mostly used by the police force in controlling riots. Alphachloroacetophenone, 2-chlorobenzalmalononitrile and acrolein are generally used as tear gas. Chlorine (Cl2) is also used in preparation of tear gas.

27. The foul smell of dead fish is due to the compound: [Jharkhand P.C.S. (Pre) 2016]

(a) Amino compounds
(b) Aldehydic compounds
(c) Sulphur compounds
(d) Nitro compounds

Correct Answer: (a) Amino compounds

Solution:Trimethylamine is a tertiary amine that is structurally an amino compound in which every hydrogen atom of ammonia is replaced by a methyl group. The odour (smell) of dead fish is due to the presence of these compounds

28. Which of the following remains in a solid state at normal temperature? [Jharkhand P.C.S. (Pre) 2003]

(a) Chlorine
(b) Bromine
(c) Iodine
(d) Fluorine

Correct Answer: (c) Iodine

Solution:The Group Seven (7) elements are also known as the halogens. They include fluorine, chlorine, bromine and Iodine which all have 7 electrons in their outer shell. Iodine is a bluish-black solid with a metallic lustre, thus it remains in a solid state at normal temperature.

29. The most reactive among the halogens is — [I.A.S. (Pre) 1997]

(a) Fluorine
(b) Chlorine
(c) Bromine
(d) Iodine

Correct Answer: (a) Fluorine

Solution:The halogens (Fluorine, Chlorine, Bromine, Iodine, Astatine) are non-metal elements that are highly electronegative and reactive. Fluorine is the smallest atom of the halogens and has the strongest ability to attract electrons from other elements, making it the most reactive halogen.

30. Bromine is a: [63rd B.P.S.C. (Pre) 2017]

Correct Answer: (d) Red liquid

Solution:Bromine is a member of the halogen group of elements. It is a fuming red-brown liquid at room temperature that evaporates readily to form a similarly colored gas.