Miscellaneous And Useful Chemical Compounds (Part-V)

1. The compound used in prickly-heat powder to prevent excessive sweating is [S.S.C. Online Graduate Level (T-I) 6.09.2016 (Shift-II)]

(a) Boric acid
(b) Phosphoric acid
(c) Carbonic acid
(d) Sulphonic acid

Correct Answer: (a) Boric acid

Solution:

Boric acid is a major component of medicated powders. Being antibacterial, it is helpful in getting rid of various cutaneous infections. For these reasons, this powder is also used in prickly heat powder to stop sweating.

2. The pressure of a gas on reducing its volume at constant temperature is [S.S.C. Online Stenographer 13.09.2017 (Shift-I)]

(a) First increases then decre
(b) Increases
(c) Decreases
(d) No change takes place

Correct Answer: (b) Increases

Solution:When the volume of a gas is reduced at a constant temperature, its pressure increases. According to Boyle's law, there is an inversely proportional relationship between the volume and pressure of a gas at constant temperature.

3. What is the melting point of ice at the sea-level at normal atmospheric pressure and at 45-degree latitude? [S.S.C. Online M.T.S. (T-I) 26.10.2021 (Shift-I)]

(a) 222.14K
(b) 273.16K
(c) 256.14K
(d) 245.18K

Correct Answer: (b) 273.16K

Solution:The melting point of ice at any point above sea level at normal atmospheric pressure is 0°C, which has a value of 273.16K on the Kelvin scale.

4. Substances which provide heat in the form of energy in the combustion process are called? [S.S.C. Online Stenographer 13.09.2017 (Shift-I)]

(a) CNG
(b) Igniter
(c) Fuel
(d) Thermal

Correct Answer: (c) Fuel

Solution:Such a substance, which provides heat in the form of energy in the combustion process, is called fuel. For example, diesel, petrol, kerosene, coal, wood, CNG, LPG, etc. are all called fuels. The type of fuel which receives less pollution and more heat is included in the category of good fuel, such as CNG, LPG, etc.

5. The brand name Teflon represents which polymer? [S.S.C. Online CHSL (T-I) 31.01.2017 (Shift-III)]

(a) Polystyrene
(b) Polypropylene
(c) Polytetrafluoroethylene
(d) Polyethylene Terephthalate

Correct Answer: (c) Polytetrafluoroethylene

Solution:Polytetrafluoroethylene, or (C₂F₄)n, is a fluoropolymer that has many uses and is known by the brand name Teflon.

6. Limestone is a raw material used by which industry? [S.S.C. Online Graduate Level (T-I) 8.09.2016 (Shift-I)]

(a) Aluminium
(b) Fertilizers
(c) Cement
(d) Petrochemicals

Correct Answer: (c) Cement

Solution:Cement is a primary material used in modern building construction. For making it, limestone and clay are burnt in a furnace at a high temperature, and the resulting clinker is mixed with gypsum and ground to a fine powder. The final product thus obtained is called ordinary Portland cement.

7. Trinitrotoluene is— [S.S.C. Online Graduate Level (T-I) 29.09.2016 (Shift-I)]

(a) Used to melt metals
(b) Used to fuse two metals
(c) Used as an abrasive
(d) Used as an explosive

Correct Answer: (d) Used as an explosive

Solution:Trinitrotoluene is a highly explosive nitrogen-containing organic compound. Its chemical formula is C₇H₅N₃O₆.

8. What is the constituent of tear gas? [S.S.C. Online Stenographer 14.09.2017 (Shift-II)]

(a) Ethane
(b) Methane
(c) Chloropicrin
(d) Ether

Correct Answer: (c) Chloropicrin

Solution:Tear gas is a gas used as a weapon. Chloropicrin is a toxic chemical with the chemical formula CCl₃NO₂. It is a tear secretion and is also harmful to the skin and respiratory system. The major tear gases are bromoacetone, xylyl bromide, etc.

9. Which of the following gas leaked in the Bhopal Gas tragedy in December 1984? [S.S.C. Online CHSL (T-I) 15.01.2017 (Shift-III)]

(a) Methyl Isocyanate
(b) Methyl Isochlorate
(c) Methyl Phosphate
(d) Methyl Isopropate

Correct Answer: (a) Methyl Isocyanate

Solution:Methyl isocyanate gas was leaked in the Bhopal gas disaster on December 3, 1984. Many people died in this, and many people suffered from physical disability to blindness. Methyl isocyanate gas is used to make insecticides.

10. The poisonous gas accidentally released in Bhopal Gas Trage [S.S.C. Online CHSL (T-I) 17.01.2017 (Shift-I)]

(a) Methane
(b) Nitrous Oxide
(c) Methyl Isocyanate
(d) Cyanogen

Correct Answer: (c) Methyl Isocyanate