Miscellaneous And Useful Chemical Compounds (Part-IV)

11. Which of the following gases reduces the Oxygen carrying capacity of the blood? [S.S.C. Online Graduate Level (T-I) 7.06.2019 (Shift-I)]

(a) Nitrous Oxide
(b) Carbon Monoxide
(c) Carbon Dioxide
(d) Nitric Oxide

Correct Answer: (b) Carbon Monoxide

Solution:Carbon monoxide reduces the oxygen-carrying capacity of the blood, as this gas combines with hemoglobin (Hb) present in the blood to form carboxyhemoglobin (COHb). It is a permanent compound, due to which the transport of oxygen by hemoglobin in the blood is inhibited.

12. Which is known as carbolic acid? [S.S.C. Online Graduate Level (T-I) 10.09.2016 (Shift-I)]

(a) Phenol
(b) Ethanol
(c) Acetic acid
(d) Oxalic acid

Correct Answer: (a) Phenol

Solution:Carbolic acid is the common name for phenol (C₆H₅OH). Plastic materials are produced with the help of carbolic acid. With its help, dyes, disinfectants, and antiseptics are also made.

13. What is the formula of butane gas? [S.S.C. Online CHSL (T-I) 19.03.2020 (Shift-I)]

(a) C₂H₁₀
(b) C₂H₆
(c) C₄H₁₀
(d) CH₄

Correct Answer: (c) C₄H₁₀

Solution:Butane is one of the saturated hydrocarbons of the alkane series (CₙH₂ₙ₊₂). Its chemical formula is C₄H₁₀. The first member of this category is methane (CH₄).

14. Ethane gas has a slightly ______ taste. [S.S.C. Online CHSL (T-I) 18.01.2017 (Shift-I)]

(a) sweet
(b) bitter
(c) sour
(d) salty

Correct Answer: (a) sweet

Solution:Ethane is an organic chemical compound. Its chemical formula is C₂H₆. Ethane has a slightly sweet taste. It is also known as a hydrocarbon.

15. Liquefied Petroleum Gas (LPG) used for cooking in homes is a combination of: [S.S.C. Online MTS (T-I) 18.10.2021 (Shift-I)]

(a) methane and propane
(b) propane and butane
(c) hexane and propane
(d) methane and butane

Correct Answer: (b) propane and butane

Solution:Liquefied petroleum gas (LPG) used for cooking in homes is a mixture of organic gases mainly propane and butane. The full name of LPG is Liquefied Petroleum Gas (LPG). To detect the leakage of LPG, some odorous substance like mercaptan, etc., is added to it.

16. LPG is a mixture of: [S.S.C. Online CHSL (T-I) 20.01.2017 (Shift-III)]

(a) Methane and Butane
(b) Butane and Propane
(c) Methane and Propane
(d) Ethane and Propane

Correct Answer: (b) Butane and Propane

17. Methyl Propane is an isomer of: [S.S.C. Online Graduate Level (T-I) 4.06.2019 (Shift-I)]

(a) n-Propane
(b) n-Hexane
(c) n-Pentane
(d) n-Butane

Correct Answer: (d) n-Butane

Solution:Methyl propane is an isomer of n-butane. Its general chemical formula is C₄H₁₀, and the structural formula is written as CH(CH₃)₃, or HC(CH₃)₃.

18. Benzene is ______ in Ethyl Alcohol. [S.S.C. Online CHSL (T-I) 25.01.2017 (Shift-II)]

(a) Soluble
(b) Solute
(c) Insoluble
(d) Insolate

Correct Answer: (c) Insoluble

Solution:Benzene is insoluble in ethyl alcohol. Ethyl alcohol is a polar compound, whereas benzene is a completely non-polar organic compound. Hence it cannot dissolve in ethyl alcohol.

19. What is the main component of natural gas? [C.P.O. S.I. 5.06.2016 (Shift-I)]

(a) Methane
(b) Helium
(c) Nitrogen
(d) Propane

Correct Answer: (a) Methane

Solution:The main component of natural gas is methane (CH₄). It is a flammable organic gas. Due to being flammable, it is used as a fuel.

20. Which one of the following is the primary component of natural gas? [S.S.C. Online MTS (T-I) 18.10.2021 (Shift-III)]

(a) Carbon Dioxide
(b) Nitrogen
(c) Methane
(d) Helium

Correct Answer: (c) Methane