Chemistry (Part-XIII)

Total Questions: 50

31. What is the constituent of tear gas? [S.S.C. Online Stenographer 14.09.2017 (Shift-II) ]

(a) Ethane
(b) Methane
(c) Chloropicrin
(d) Ether

Correct Answer: (c) Chloropicrin

Solution:Tear gas is a gas used as a weapon. Chloropicrin is a toxic chemical with the chemical formula CCl₃NO₂. It is a tear secretion and is also harmful to the skin and respiratory system. The major tear gases are bromoacetone, xylyl bromide, etc.

32. Which of the following gas leaked in the Bhopal Gas tragedy in December 1984? [S.S.C. Online CHSL (T-I) 15.01.2017 (Shift-III) ]

(a) Methyl Isocyanate
(b) Methyl Isochlorate
(c) Methyl Phosphate
(d) Methyl Isopropate

Correct Answer: (a) Methyl Isocyanate

Solution:Methyl isocyanate gas was leaked in the Bhopal gas disaster on December 3, 1984. Many people died in this and many people suffered from physical disability to blindness. Methyl isocyanate gas is used to make insecticides.

33. The poisonous gas accidentally released in Bhopal Gas Tragedy is _____ . [S.S.C. Online CHSL (T-I) 17.01.2017 (Shift-I) ]

(a) Methane
(b) Nitrous Oxide
(c) Methyl Isocyanate
(d) Cyanogen

Correct Answer: (c) Methyl Isocyanate

34. Iodex, a pain relief balm, has the smell of ______. [S.S.C. Online Graduate Level (T-I) 2.09.2016 (Shift-II) ]

(a) Methyl Salicylate
(b) Ethyl Salicylate
(c) Propyl Salicylate
(d) Butyl Salicylate

Correct Answer: (a) Methyl Salicylate

Solution:Methyl salicylate (

C₈ H₈ O₃

) is an organic ester that is naturally found in wintergreen plants. It has a characteristic strong, sweet, and medicinal scent, often described as "wintergreen smell," which is a key component of many topical pain relief balms like Iodex, because of its counter-irritant and analgesic properties.

35. What is Marble Cancer? [S.S.C. Online Graduate Level (T-I) 7.06.2019 (Shift-I) ]

(a) Cancer in human due to working in mines
(b) Corrosion of marble due to acid rain
(c) Disease in animals due to marble mines
(d) Soil degradation due to marble mines

Correct Answer: (b) Corrosion of marble due to acid rain

Solution:"Marble cancer" is a colloquial term for the damage and degradation of marble structures (like monuments, statues, and buildings) caused by acid rain. Acid rain contains sulfuric acid and nitric acid, which react with the calcium carbonate (

C a C O₃

) in marble, causing it to corrode, discolour, and eventually crumble. This phenomenon is famously observed in historical buildings like the Taj Mahal.

36. In chemistry, soap is a salt of _______ . [S.S.C. Online CHSL (T-I) 25.01.2017 (Shift-I) ]

(a) Fatty acids
(b) Glycol
(c) Phosphorus
(d) Ammonium carbonate

Correct Answer: (a) Fatty acids

Solution:Soaps are typically salts of fatty acids. They are produced by the saponification (hydrolysis) of fats and oils with a strong alkali (like sodium hydroxide for hard soap or potassium hydroxide for soft soap). The resulting molecules have a long hydrocarbon chain (from the fatty acid) and a polar carboxylate group, allowing them to act as surfactants. For example, sodium stearate is a common soap.

37. A basic salt used in daily life is ______ . [S.S.C. Online MTS (T-I) 19.09.2017 (Shift-III) ]

(a) Ammonium phosphate
(b) Sodium Chloride
(c) Ammonium Sulphate
(d) Sodium Carbonate

Correct Answer: (b) Sodium Chloride

Solution:The basic salt used in daily life is called common salt or sodium chloride (NaCl).

38. What is the chemical name of salt? [S.S.C. Online MTS (T-I) 9.08.2019 (Shift-III) ]

(a) magnesium dioxide
(b) calcium chloride
(c) sodium sulfate
(d) sodium chloride

Correct Answer: (d) sodium chloride

Solution:Sodium chloride, also known as salt, common salt, table salt or halite, is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions.

39. What is the chemical name of the salt found abundantly in seawater? [S.S.C. Online CHSL (T-I) 18.03.2020 (Shift-III) ]

(a) Sodium Acetate
(b) Sodium Nitrite
(c) Sodium Tartrate
(d) Sodium Chloride

Correct Answer: (d) Sodium Chloride

Solution:The chemical name for the salt found in abundance in seawater is sodium chloride (NaCl). The amount of NaCl in seawater is about 85 percent of the total dissolved salt content.

40. Which chemical compound is composed of magnesium, sulphur and oxygen and is commonly used in detox bath to relax muscles and relieve pain in the shoulders, neck, back and scalp? [S.S.C. Online CHSL (T-I) 02.06.2022 (Shift-II) ]

(a) Epsom salt
(b) Glauber's salt
(c) Potash alum
(d) Rock salt

Correct Answer: (a) Epsom salt

Solution:Epsom salt is the common name for magnesium sulfate ( $M g S O₄ \cdot 7 H₂ O$ ). It is well-known for its use in bath salts, where it is dissolved in warm water for soaking sore muscles, reducing swelling, and promoting relaxation. The magnesium is believed to be absorbed through the skin.

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