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Alloys

📆 October 21, 2024

Total Questions: 42

1. Out of the following which is not an alloy? [M.P.P.C.S. (Pre) 1998]

Correct Answer: (d) Copper
Solution:Copper is a metal, however steel, brass and bronze are alloys.

2. Statement (A): Galvanized iron does not rust. [U.P. Lower Sub. (Pre) 2002]

Statement (R): Zinc has the efficiency of oxidation.
Code:

Correct Answer: (a) Both (A) and (R) are correct, and (R) is the right clarification of (A).
Solution:

Galvanization is the process of applying a protective zinc coating on steel or iron to prevent them from rusting and oxidation. The zinc forms a barrier between atmospheric oxygen and the underlying iron or steel. It does this by transferring electrons and oxidizing more quickly than iron. This rapid zinc oxidation prevents ferrous metals from rusting until the zinc has exhausted its free-electron capacity or the protective coating has worn away.

3. Galvanized iron pipes have a coating of: [63rd B.P.S.C. (Pre) 2017]

Correct Answer: (a) Zinc
Solution:

Galvanization is the process of applying a protective zinc coating on steel or iron to prevent them from rusting and oxidation. The zinc forms a barrier between atmospheric oxygen and the underlying iron or steel. It does this by transferring electrons and oxidizing more quickly than iron. This rapid zinc oxidation prevents ferrous metals from rusting until the zinc has exhausted its free-electron capacity or the protective coating has worn away.

4. The plates of galvanized iron remain protected from rust because of the existence of: [I.A.S. (Pre) 1994]

Correct Answer: (c) Zinc
Solution:

Galvanization is the process of applying a protective zinc coating on steel or iron to prevent them from rusting and oxidation. The zinc forms a barrier between atmospheric oxygen and the underlying iron or steel. It does this by transferring electrons and oxidizing more quickly than iron. This rapid zinc oxidation prevents ferrous metals from rusting until the zinc has exhausted its free-electron capacity or the protective coating has worn away.

5. Galvanized iron is coated with: [Chhattisgarh P.C.S. (Pre) 2011]

Correct Answer: (d) Zinc
Solution:Galvanization is the process of applying a protective zinc coating on steel or iron to prevent them from rusting and oxidation. The zinc forms a barrier between atmospheric oxygen and the underlying iron or steel. It does this by transferring electrons and oxidizing more quickly than iron. This rapid zinc oxidation prevents ferrous metals from rusting until the zinc has exhausted its free-electron capacity or the protective coating has worn away.

6. Which one of the following is essential in corrosion of iron metal? [U.P. R.O./A.R.O. (Pre) (Re. Exam) 2016]

Correct Answer: (b) Oxygen and moisture
Solution:Oxygen and moisture are essential in the corrosion of iron metal. Iron corrosion is generally characterized by the formation of rust due to an electrochemical process in the presence of oxygen and moisture (water) in the surrounding environment. When iron reacts with water and oxygen, iron (II) hydroxide is formed. The latter further reacts with oxygen and water to form hydrated iron (III) oxide—widely known as rust.

7. Which metal is generally used for coating of brass utensils to prevent copper contamination? [R.A.S/R.T.S (Pre) 2018]

Correct Answer: (a) Tin
Solution:The coating of tin on brass utensils prevents copper contamination. Tin is a soft and white metal like silver. Its symbol is Sn with atomic number 50.

8. Aluminium surface is often "Anodized". This means the deposition of a layer of— [I.A.S. (Pre) 2000]

Correct Answer: (b) Aluminium Oxide
Solution:Anodizing is an electrochemical process by which the surface of a metal is made durable and rust-resistant. In this process, a layer of aluminium oxide is deposited on aluminium.

9. Alloy of which metal is used to make aeroplanes and parts of the compartment of the train? [43rd B.P.S.C. (Pre) 1999]

Correct Answer: (c) Aluminium
Solution:Low density and strength make aluminium ideal for the construction of aircraft, lightweight vehicles, and ladders. An alloy of aluminium called Duralumin is often used instead of pure aluminium because of its improved properties. Easy shaping and corrosion resistance make aluminium a good material for drinking cans and roofing materials.

10. Mercury-metal mixture is— [39th B.P.S.C. (Pre) 1994]

Correct Answer: (c) Mercury mixed alloy
Solution:An amalgam is a substance formed by the reaction of Mercury with another metal. Almost all metals can form amalgams with Mercury, the notable exception being Iron.
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