Chemistry (Part-IX)

11. What is the chemical name of 'oil of vitriol'? [S.S.C. Online CHSL (T-I) 13.10.2020]

(a) Sulfuric Acid
(b) Calcium Hydroxide
(c) Sodium Chloride
(d) Methyl Alcohol

Correct Answer: (a) Sulfuric Acid

Solution:The chemical name of Oil of Vitriol is sulfuric acid (H₂SO₄). Calcium hydroxide [Ca(OH)₄] is also called ‘slaked lime’. Sodium chloride (NaCl) is the chemical name of salt. Methyl alcohol [CH₃OH] is also called ‘wood alcohol’. It is poisonous.

12. For extinguishing fire, we use _____ . [S.S.C. Online Graduate Level (T-I) 30.08.2016]

(a) Hydrogen
(b) Carbon Monoxide
(c) Carbon Dioxide
(d) Marsh Gas

Correct Answer: (c) Carbon Dioxide

Solution:Carbon dioxide gas is used in fire fighting, as this gas Misplaces the oxygen (O₂) gas required for burning. Therefore, in the absence of oxygen, the fire is extinguished.

13. Heavy water is _____ . [S.S.C. Online CHSL (T-I) 18.01.2017]

(a) Moratorium oxide
(b) Polytorium Oxide
(c) Deuterium oxide
(d) Tritium Oxide

Correct Answer: (c) Deuterium oxide

Solution:Heavy water is called deuterium oxide (D₂O). Deuterium is the only isotope of hydrogen, whose symbol is H. It is a type of heavy hydrogen in which 1 neutron is present along with 1 proton in the nucleus. The compound formed of heavy hydrogen with oxygen is called heavy water. It is used as a moderator in nuclear reactors.

14. Which of the following is an effective fire extinguisher? [S.S.C. Online CHSL (T-I) 27.01.2017]

(a) Argon
(b) Halons
(c) Halogen
(d) Helium

Correct Answer: (b) Halons

Solution:Halons is a liquefied, compressed gas that stops the spread of fire by chemically disrupting combustion. It is an extraordinarily effective fire extinguishing agent even at low concentrations.

15. The salt of which of the following element provide color to fireworks? [C.P.O. S.I. 5.06.2016]

(a) Zinc and Sulfur
(b) potassium and mercury
(c) Strontium and Barium
(d) Chromium and Nickel

Correct Answer: (c) Strontium and Barium

Solution:Strontium and Barium Salts of Strontium (producing red colors) and Barium (producing green colors) provide color to fireworks.

16. Which of the following is NOT a good conductor of electricity? [S.S.C. Online CHSL (T-I) 14.10.2020]

(a) Graphite
(b) Bromine
(c) Copper
(d) Silver

Correct Answer: (b) Bromine

Solution: Bromine Bromine is a nonmetal and is not a good conductor of electricity. Graphite is an allotrope of carbon and is a good conductor, while copper and silver are metals and excellent conductors.

17. Magnesium ribbon burns with a dazzling ______ . [S.S.C. JE Mechanical Exam 27.10.2020]

(a) Purple colour flame
(b) Orange colour flame
(c) Blue colour flame
(d) White colour flame

Correct Answer: (d) White colour flame

Solution:White colour flame Magnesium ribbon burns with a dazzling white flame.

18. The chemical name of quartz is ______ . [S.S.C. Online Graduate Level (T-I) 30.08.2016]

(a) Calcium Oxide
(b) Calcium Phosphate
(c) Sodium Phosphate
(d) Sodium Silicate

Correct Answer: (d) Sodium Silicate

Solution: Sodium Silicate : The chemical name of quartz is Silicon Dioxide (

S i O₂

). Sodium Silicate is also known as water glass. Correction: The provided options do not contain the correct chemical name for quartz. Silicon Dioxide (

S i O₂

) is the chemical name of quartz.

19. In which industry is potassium nitrate is used commercially? [S.S.C. Online Graduate Level (T-I) 11.08.2017]

(a) Glass manufacturing
(b) Electroplating
(c) Fire Crackers Manufacturing
(d) Leather Industry

Correct Answer: (c) Fire Crackers Manufacturing

Solution: Fire Crackers Manufacturing Potassium nitrate (

K N O₃

) is commercially used in firecracker manufacturing as an oxidizer.

20. What is washing soda? [S.S.C. Online CHSL (T-I) 3.02.2017]

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

Correct Answer: (d) Sodium Carbonate

Solution:Washing soda is also known as sodium carbonate. Its chemical formula is Na₂CO₃⋅10H₂O. It is an inorganic compound which is used to remove the hardness of water and in washing powders used for washing clothes.