Miscellaneous And Useful Chemical Compounds (Part-VI)

Total Questions: 49

41. What is the correct combination of marsh gas? [C.P.O. S.I. 4.06.2016 (Shift-I)]

(a) CO₂, CO and N₂, CO and N₂
(b) CH₄ and H₂
(c) CH₄
(d) CO

Correct Answer: (c) CH₄

Solution:The chemical combination of methane or marsh gas is CH₄. It is the first member of the alkane series. It is found in marshy places. It is the major component of natural gas.

42. Who is responsible for the discovery of hydrogen? [C.P.O. S.I. 4.06.2016 (Shift-I)]

(a) David Bushwell
(b) Ernest Rutherford
(c) James Chadwick
(d) Henry Cavendish

Correct Answer: (d) Henry Cavendish

Solution:Hydrogen is a chemical element. It is the first element of the periodic table. It is found in nature as a dimolecular gas. It was discovered by Henry Cavendish in 1766. It was named by Antoine Lavoisier.

43. Who discovered Hydrogen? [S.S.C. Online MTS (T-I) 9.10.2017 (Shift-III)]

(a) Henry Cavendish
(b) George Cayley
(c) Samuel Colt
(d) WC Roentgen

Correct Answer: (a) Henry Cavendish

44. lonizing____ has/have sufficient energy to affect the atoms in living cells and thereby damage their genetic material. [S.S.C. JE Electrical Exam 10.12.2020 (Shift-II)]

(a) Water
(b) Chemicals
(c) Radiation
(d) Reaction

Correct Answer: (c) Radiation

Solution:

Ionizing radiation has enough energy to affect the atoms in living cells and damage their genetic material. Ionic radiation damages the reproductive cells, resulting in changes that pass from one generation to the next. Ionizing radiation is also known as radioactivity.

45. What is the defined value of k_B in the given equation? [S.S.C. Online CPO SI (T-I) 09.11.2022 (Shift-I)]

(a) 38 × 10^-23 JK^-1
(b) 1.08 × 10^-23 JK^-1
(c) 1.68 × 10^-23 JK^-1
(d) 0.38 × 10^-23 JK^-1

Correct Answer: (d) 0.38 × 10^-23 JK^-1

Solution:

In this equation, P is the pressure of the gas, V is the volume of the gas, T is the temperature of the gas, and N is the number of particles (atoms or mole- cules) in the gas. The Boltzmann constant, kₐ, has a defined value of 1.380649 × 10^-23 joules per kelvin (J/K) in the International System of Units (SI). It is a fundamental constant of nature and plays a key role in statistical mechanics, which is the branch of phys- ics that deals with the behavior of large numbers of particles in systems.

46. As per WHO (World Health Organization), which of the following is NOT an example of disinfection by-products formed at traditional drinking water treatment plants? [S.S.C. Online CGL (T-1) 21.04.2022 (Shift-I)]

(a) Titania
(b) Bromate
(c) Chlorate
(d) Chlorite

Correct Answer: (a) Titania

Solution:Disinfection by-products such as Bromate, Chlorite, and Chlorate are formed at traditional drinking water treatment plants. Therefore, Titania is not among the examples of disinfection by-products formed at such facilities.

47. Acidic liners are made of _ or _ acid which are powerful enough to be used to treat coarse hair, food, grease, soap scum, or paper-based messes to clean up in 15 minutes or less. [S.S.C. Online CGL (T-1) 20.04.2022 (Shift-III)]

(a) Malic, lactic
(b) Nitric, carbonic
(c) Formic, citric
(d) Sulfuric, hydrochloric

Correct Answer: (d) Sulfuric, hydrochloric

Solution:Acidic liners are made of either hydrochloric acid or sulfuric acid which are powerful enough to be used to treat coarse hair, food, grease, soap scum, or paper-based messes and clean them up in 15 minutes or less. However, it's important to note that these acids can be very dangerous and should be used with caution and proper safety measures. It's recommended to always read the instructions and warnings carefully before using any acidic cleaners.

48. Food containing oil and fat, when kept for a long time, changes its taste and smell due to which process? [S.S.C. Online Constable GD 14.02.2019 (Shift-III)]

(a) Decomposition
(b) Rancidity
(c) Substitution
(d) Fermentation

Correct Answer: (b) Rancidity

Solution:When foods containing oils and fats are kept for a long time, they start producing a foul smell, this process is called rancidity. Fats and oils get oxidized over a long period of time and give rise to a special type of odor i.e. they become rancid.

49. Match the gases in column I with their odor in column II. [S.S.C. Online CPO S.I. (T-1) 11.11.2022 (Shift-II)]

Column I	Column II
A. CO₂	1. Colourless gas with the smell of rotten eggs
B. H₂S	2. A colourless, odorless gas
C. SO₂	3. Colourless gas with a pungent smell

	A	B	C
(a)	1	2	3
(b)	2	1	3
(c)	2	3	1
(d)	3	1	2

Correct Answer: (b)

Solution:Carbon Dioxide (CO₂):

It is a colourless, odorless gas.
Carbon Dioxide is often used in the food, oil, and chemical industries.

Hydrogen Sulfide (H₂S):

It is a colourless gas with the smell of rotten eggs.
It is used in the water purifying process.

Sulphur Dioxide (SO₂):

It is a colourless gas with a pungent smell.
It is used in food preservatives, refrigerants, and beach products. However, sulphur Dioxide is very toxic and can cause death.
Therefore, option (b) is correct.

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