Chemistry (Part-XIV)

Total Questions: 50

31. The common name of calcium hydroxide is _______. [S.S.C. Online MTS (T-I) 19.09.2017 (Shift-III) ]

(a) Plaster
(b) Slaked lime
(c) Eating soda
(d) Washing soda

Correct Answer: (b) Slaked lime

Solution:Calcium hydroxide, with the chemical formula Ca(OH)₂, is commonly known as slaked lime or hydrated lime. It is produced by reacting calcium oxide (CaO, quicklime) with water. It's used in various applications, including construction (in mortars and plasters), agriculture (to reduce soil acidity), and water treatment.

32. What is baking soda? [S.S.C. Online CHSL (T-I) 7.01.2017 (Shift-I) ]

(a) Aluminium Bicarbonate
(b) Sodium Isolate
(c) Sodium Bicarbonate
(d) Aluminium Sulphate

Correct Answer: (c) Sodium Bicarbonate

Solution:Baking soda is the common household name for sodium bicarbonate (or sodium hydrogen carbonate), which has the chemical formula NaHCO₃. It is a white crystalline powder commonly used as a leavening agent in baking due to its ability to release carbon dioxide gas when heated or when it reacts with an acid.

33. NaHCO₃ is chemical formula for _____ . [S.S.C. Online CHSL (T-I) 1.02.2017 (Shift-II) ]

(a) Borax
(b) Vinegar
(c) Lime
(d) Baking soda

Correct Answer: (d) Baking soda

Solution:The chemical name of baking soda is sodium bicarbonate. Its chemical formula is NaHCO₃. It is also called 'Baking Soda' because it is used in the bakery industry to make bread etc.

34. The common name of Sodium Bicarbonate is _____ . [S.S.C. Online CHSL (T-I) 20.01.2017 (Shift-II) ]

(a) Baking soda
(b) Borax
(c) Bleach
(d) Epsom salt

Correct Answer: (a) Baking soda

35. Complete the statement: Sodium hydrogen carbonate is used _____ . [S.S.C. Online M.T.S. (T-I) 11.10.2021 (Shift-II) ]

(a) as a cleaning agent for domestic purposes
(b) for removing permanent hardness of water
(c) in the manufacture of borax
(d) in soda-acid fire extinguishers

Correct Answer: (d) in soda-acid fire extinguishers

Solution:Sodium hydrogen carbonate (baking soda) is a key component in soda-acid fire extinguishers. In these extinguishers, sodium bicarbonate solution is kept separate from an acid (like sulfuric acid). When activated, the acid and sodium bicarbonate mix, producing a large amount of carbon dioxide gas. This CO₂ gas smothers the fire by displacing oxygen.

36. Which mineral is present in rock salt? [S.S.C. Online C.P.O.S.I. (T-I) 3.07.2017 (Shift-II) ]

(a) Gypsum
(b) Sodium
(c) Potassium
(d) Magnesium

Correct Answer: (b) Sodium

Solution:Rock salt is primarily composed of the mineral halite, which is chemically sodium chloride (NaCl). While sodium is an element and not a mineral itself, in the context of the options provided, "Sodium" refers to the dominant element in the compound that forms rock salt.

37. Which of the following is one of the main active sulphur-containing compounds present in garlic and onion? [S.S.C. Online MTS (T-I) 11.10.2021 (Shift-I) ]

(a) Ethanol
(b) Cellulose
(c) Phenol
(d) Allicin

Correct Answer: (d) Allicin

Solution:Allicin is a pungent, organosulfur compound obtained from garlic, and it's responsible for the strong, characteristic smell and many of the purported health benefits of freshly crushed garlic. Similar sulfur compounds contribute to the aroma and properties of onions. Allicin is formed enzymatically when garlic is crushed or chopped.

38. Which of the following is also known as Epsom salt? [S.S.C. Online Graduate Level (T-I) 5.03.2020 (Shift-III) ]

(a) Sodium Sulphate
(b) Ferrous Sulphate
(c) Calcium Sulphate
(d) Magnesium Sulphate

Correct Answer: (d) Magnesium Sulphate

Solution:Magnesium sulfate (MgSO₄·7H₂O, specifically the heptahydrate) is commonly known as Epsom salt. It is a mineral compound used for various purposes, including bathing (muscle relaxation), as a laxative, and in gardening.

39. National Chemical Laboratory (India) is located at- [C.P.O. S.I. 5.06.2016 (Shift-II) ]

(a) Mumbai
(b) Bangalore
(c) Hyderabad
(d) Pune

Correct Answer: (d) Pune

Solution:The National Chemical Laboratory (NCL) is a premier Indian government laboratory located in Pune, Maharashtra. It is a constituent laboratory of the Council of Scientific and Industrial Research (CSIR) and focuses on research in chemical and related sciences.

40. Kinetics is the study of? [C.P.O. S.I. 5.06.2016 (Shift-I) ]

(a) rate of chemical reaction.
(b) how fast the reaction takes place.
(c) Mechanism and pathway of molecules to incorporate products from a reactant.
(d) All are true

Correct Answer: (d) All are true

Solution:In physics and engineering, kinetics is the branch of classical mechanics that is concerned with the relationship between motion and its causes, specifically, forces and torques. The term kinetics is also used to refer to chemical kinetics, particularly in chemical physics and physical chemistry.

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