Chemistry (Part-III)

21. The manufacturing of iron from iron-ore in voives the process of_______. [S.S.C. Online Graduate Level (T-I) 6.09.2016]

(a) Oxidation
(b) Reduction
(c) Electrolysis
(d) Fractional distillation

Correct Answer: (b) Reduction

Solution:The manufacturing of iron from iron ore primarily involves the process of Reduction. Iron ore typically contains iron oxides. In the blast furnace, these iron oxides are reduced by carbon monoxide (formed from the reaction of coke with hot air) to produce metallic iron.

22. ________ is a process of forming a thick oxide layer of aluminium. [S.S.C. Online C.H.S.L. (T-I) 12.08.2021]

(a) Ductility
(b) Anodizing
(c) Corrosion
(d) Galvanisation

Correct Answer: (b) Anodizing

Solution:
Anodizing is a process of forming a thick oxide layer of aluminum. This layer is created by electrolysis and provides corrosion resistance and can also be colored for decorative purposes.

23. The process of protecting iron by coating with Zine is called ________. [S.S.C. Online MTS (T-I) 4.10.2017]

(a) Quenching
(b) Galvanising
(d) Metallurgy
(c) Rusting

Correct Answer: (b) Galvanising

Solution:The process of protecting iron by coating it with zinc is called Galvanising. The zinc layer acts as a barrier and also sacrificially corrodes, protecting the iron even if the coating is scratched.

24. The reactions in which oxidation and reduction occur simultaneously are called _________ . [S.S.C. Online CHSL (T-I) 9.01.2017]

(a) Feral Reactions
(b) Redox Reactions
(c) Demug Reactions
(d) Kerol Reactions

Correct Answer: (b) Redox Reactions

Solution:The reactions in which oxidation and reduction occur simultaneously are called Redox Reactions. Oxidation involves the loss of electrons or an increase in oxidation state, while reduction involves the gain of electrons or a decrease in oxidation state. Thesetwo processes always occur together in a redox reaction.

25. What happens in an oxidation reaction? [S.S.C. Online CHSL (T-I) 9.01.2017]

(a) Protons are lost
(b) Electrons are lost
(c) Neutrons are lost
(d) Electrons are gained

Correct Answer: (b) Electrons are lost

Solution:In an oxidation reaction, Electrons are lost. Oxidation can also involve the gain of oxygen or an increase in oxidation state.

26. In which process is there a gain of an electron? [S.S.C. Online Stenographer 14.09.2017]

(a) Decomposition
(b) Reduction
(c) Oxidation
(d) Modification

Correct Answer: (b) Reduction

Solution:In Reduction, there is a gain of an electron. Reduction can also involve the loss of oxygen or a decrease in oxidation state.

27. Which among the following is not a characteristic of oxidation reaction? [S.S.C. Online CHSL (T-I) 10.01.2017 (Shift-II)]

(a) It involves addition of Hydrogen
(b) It involves addition of Oxygen
(c) It involves loss of electrons
(d) It involves addition of electronegative element

Correct Answer: (a) It involves addition of Hydrogen

Solution:

It involves addition of Hydrogen is NOT a characteristic of an oxidation reaction. The addition of hydrogen is typically associated with reduction reactions. Oxidation reactions involve:

Addition of Oxygen
Loss of electrons
Addition of an electronegative element
Increase in oxidation state

28. What is deposited on iron in the process of galvanisation? [S.S.C. Online Graduate Level (T-I) 6.06.2019]

(a) Copper
(b) Tin
(c) Zinc
(d) Aluminium

Correct Answer: (c) Zinc

Solution:Galvanization is a process of protecting iron or steel from rusting by coating them with a thin layer of zinc.

29. Rust needs three components to occur, ___________. [S.S.C. Online Graduate Level (T-I) 6.06.2019]

(a) Helium, Hydrogen and Nitrogen
(b) Iron, Nitrogen and moisture
(c) Steel, Iron and Oxygen
(d) Iron, Oxygen and Moisture

Correct Answer: (d) Iron, Oxygen and Moisture

Solution:Rusting of iron requires three main components: Iron, Oxygen, and Moisture. Iron reacts with oxygen in the presence of water (moisture) to form hydrated iron oxides, which we know as rust.

30. In which process is a protective zinc coating applied on iron to prevent it from rusting? [S.S.C. Online CHSL (T-I) 12.10.2020]

(a) Galvanisation
(b) Smelting
(c) Annealing
(d) Welding

Correct Answer: (a) Galvanisation

Solution:Galvanization is the process of applying a coating of zinc to steel or iron. This is done to protect steel and iron from the process of rusting.