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Chemistry (Part-XII)

📆 May 20, 2025

Total Questions: 50

21. Which of the following is used for the ripening of fruits? [S.S.C. Online C.P.O.S.I. (T-I) 3.07.2017 (Shift-II) ]

Correct Answer: (b) Ethylene
Solution:Ethylene gas is used for ripening fruits. It is an unsaturated hydrocarbon. The chemical formula of ethylene is C₂H₄. It is a compound containing a carbon-carbon double bond. its structure is as given below         

22. Whitewashed walls appear to be shiny after three to four days due to the formation of: [S.S.C. Online MTS (T-I) 20.10.2021 (Shift-III) ]

Correct Answer: (d) calcium carbonate
Solution:When painted walls are coated with lime Ca(OH)₂ calcium carbonate (CaCO₃) is formed by the action of atmospheric carbon dioxide (CO₂). This action goes like this-

Ca(OH)₂ + CO₂ → CaCO₃ + H2O (calcium carbonate) is a white salt, so the wall becomes shinier.

23. Name the gas used in preparation of bleaching powder. [S.S.C. Online Graduate Level (T-I) 1.09.2016 (Shift-I) ]

Correct Answer: (d) Chlorine
Solution:The gas used in the preparation of bleaching powder is chlorine (Cl₂) Chlorine gas is passed through calcium hydroxide (Ca(OH)₂ ) solution to make bleaching powder and the following reaction takes place-

Ca(OH)₂ + Cl₂ → CaOCl₂ + H₂O

↓

(bleaching powder)

24. What is the common name of Ca(OCl)₂? [S.S.C. Online C.P.O.S.I. (T-I) 7.07.2017 (Shift-I) ]

Correct Answer: (b) Bleaching powder
Solution:Ca(OCl)₂ is a common name for bleaching powder, whose chemical name is calcium hypochloride. It is an inorganic compound, which is white in color. This gives off a strong chlorine smell. It is also used to make chloroform and chlorine gas.

25. Bleaching powder is ______ . [S.S.C. Online MTS (T-I) 5.10.2017 (Shift-III) ]

Correct Answer: (b) Ca(OCl)₂
Solution:Ca(OCl)₂ is a common name for bleaching powder, whose chemical name is calcium hypochloride. It is an inorganic compound, which is white in color. This gives off a strong chlorine smell. It is also used to make chloroform and chlorine gas.

26. What is the common name of Ca(OCl)₂? [S.S.C. Online Graduate Level (T-I) 11.08.2017 (Shift-III) ]

Correct Answer: (c) Bleaching powder
Solution:Ca(OCl)₂ is a common name for bleaching powder, whose chemical name is calcium hypochloride. It is an inorganic compound, which is white in color. This gives off a strong chlorine smell. It is also used to make chloroform and chlorine gas.

27. What is the common name of calcium hypochloride? [S.S.C. Online C.P.O.S.I. (T-I) 5.07.2017 (Shift-II) ]

Correct Answer: (b) Bleaching powder
Solution:Ca(OCl)₂ is a common name for bleaching powder, whose chemical name is calcium hypochloride. It is an inorganic compound, which is white in color. This gives off a strong chlorine smell. It is also used to make chloroform and chlorine gas.

28. What is the generic name of calcium sulphate hemihydrate? [S.S.C. Online C.H.S.L. (T-I) 04.08.2021 (Shift-II) ]

Correct Answer: (a) Plaster of Paris
Solution:Calcium sulfate hemihydrate (CaSO₄.1/2 H₂O) is also known as plaster of Paris. It is also used in ceramics, the medical field, and construction work is done.

29. Plaster of Paris is obtained by heating ______ . [S.S.C. Online MTS (T-I) 5.10.2017 (Shift-I) ]

Correct Answer: (a) Gypsum
Solution:Gypsum is a soft sulfate mineral, which occurs as calcium sulfate dihydrate (CaSO₄.2H₂O). When gypsum is superheated (about 150°C), a white powder containing powdered calcium sulfate hemihydrate [CaSO₄.1/2 H₂O] is obtained. This is called Plaster of Paris.

30. Which of the following is the chemical name of baking soda? [S.S.C. Online Graduate Level (T-I) 11.06.2019 (Shift-II) ]

Correct Answer: (b) Sodium Hydrogen Carbonate
Solution:Baking soda is commonly known by its chemical name, sodium hydrogen carbonate (also called sodium bicarbonate). Its chemical formula is NaHCO₃. It is a leavening agent used in baking due to its ability to release carbon dioxide gas when it reacts with an acid or is heated.
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