Chemistry (Part-IX)

31. The Chemical formula of Ammonium Sulphate is _______. [S.S.C. Online CHSL (T-I) 27.01.2017]

(a) NH₄ SO₄
(b) (NH₄)₂SO₃
(c) NH₄SO₃
(d) (NH₄)₂SO₄

Correct Answer: (d) (NH₄)₂SO₄

Solution:The chemical formula of ammonium sulphate is (NH₄)₂SO₄

. It is one such inorganic salt that has many commercial uses. Mainly ammonium sulphate is used as a chemical fertilizer.

32. The chemical formula of Aluminum Chloride. [S.S.C. Online CHSL (T-I) 24.01.2017]

(a) AlCl
(b) AlCl₂
(c) AlCl₃
(d) Al₂Cl₃

Correct Answer: (c) AlCl₃

Solution:The chemical formula for aluminium chlorde is AlCl₃, It is a covalent compound.

33. The chemical formula of Ammonium Chloride is _______ . [S.S.C. Online CHSL (T-I) 30.01.2017]

(a) (NH₄)₂Cl
(b) NH₄Cl₃
(c) NH₄Cl₂
(d) NH₄Cl

Correct Answer: (d) NH₄Cl

Solution:Ammonium chloride (NH₄Cl) is a salt whose main use is to provide nitrogen in chemical food and as an electrolyte in dry cells. It is formed by the combination of ammonium ion NH and chloride ion Cl.

34. The chemical formula of Ammonium Oxalate is _______ . [S.S.C. Online CHSL (T-I) 25.01.2017 (Shift-II) ]

(a) NH₄C₂O₄
(b) (NH₄)₂CO₄
(c) (NH₄)₂C₂O₄
(d) (NH₄)₂C₂O₃

Correct Answer: (c) (NH₄)₂C₂O₄

Solution:The chemical formula of ammonium oxalate is (NH₄)₂C₂O₄. Under standard conditions, it remains a colorless and odorless salt. It is formed in the body as a result of the metabolism of glyoxylic acid and is found in many plants and vegetables.

35. Helium is added to the oxygen supply of deep sea divers because it is ______ . [S.S.C. Online Graduate Level (T-I) 27.08.2016 (Shift-III) ]

(a) Less poisonous than nitrogen
(b) Less soluble in blood than nitrogen at high pressure
(c) Readily miscible with oxygen
(d) Lighter than nitrogen

Correct Answer: (b) Less soluble in blood than nitrogen at high pressure

Solution:Less soluble in blood than nitrogen at high pressure. Helium is added to the oxygen supply of deep-sea divers because it is less soluble in blood than nitrogen at high pressure, which helps to prevent the bends (decompression sickness).

36. What are Aldehydes? [S.S.C. Online Graduate Level (T-I) 8.09.2016 (Shift-III) ]

(a) Mild oxidising agents
(b) Strong oxidising agents
(c) Strong reducing agents
(d) Mild reducing agents

Correct Answer: (c) Strong reducing agents

Solution:Aldehydes have a characteristic functional group where a carbon atom is double-bonded to oxygen and also bonded to a hydrogen atom. This hydrogen atom makes them susceptible to oxidation, meaning they can readily donate electrons to other molecules, hence their classification as strong reducing agents.

37. Ethanoic acid is also known as glacial acetic acid as it: [S.S.C. Online MTS (T-I) 18.10.2021 (Shift-I) ]

(a) crystallizes easily
(b) freezes in cold climate
(c) is volatile during winter
(d) is a liquid during winter

Correct Answer: (b) freezes in cold climate

Solution:

Freezes in cold climate: Ethanoic acid is also known as glacial acetic acid because in a pure state, it freezes at around 16.7 °C (which can feel like a cold climate), forming ice-like crystals.

38. Aromatic hydrocarbons contain at least _______ benzene like ring in their molecules. [S.S.C. Online CHSL (T-I) 10.01.2017 (Shift-I) ]

(a) four
(b) three
(c) two
(d) one

Correct Answer: (d) one

Solution:Aromatic hydrocarbons are benzene (C₆H₆) compounds with a characteristic odor. In these, a variety of compounds are obtained when one or more of the 6 hydrogen atoms of the benzene ring is replaced by another group. For example, phenol [C₆H₅(OH), toluene (C₆H₅, CH₃) and nitrobenzene (C₆H₅ NO₂), etc.

39. Which among the following is used as the fining agent in wine? [S.S.C. Online C.H.S.L. (T-I) 06.08.2021 (Shift-I) ]

(a) Chlorine
(b) Sodium
(c) Gelatin
(d) Baking Soda

Correct Answer: (c) Gelatin

Solution:Gelatin obtained from animal tissues is a good fining agent for wine or red wine, as it is suitable for precipitating suspended particles and reducing tannin content.

40. Ethylene is a _______ molecule. [S.S.C. Online CHSL (T-I) 16.01.2017 (Shift-III) ]

(a) polar
(b) ionic
(c) covalent
(d) nonpolar

Correct Answer: (d) nonpolar

Solution:Ethylene is a simple organic compound, a colorless gas with a pungent odor. Ethylene is a nonpolar molecule because there are two bonds between the two carbon atoms, with no difference in their negativity. This is the reason that the shared pair of electrons is located between the two carbon atoms. As a result, ethylene is a nonpolar and linear molecule.