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Chemistry (Part-V)

📆 October 29, 2024

Total Questions: 23

1. Which of the following metals is used to make cooking vessels? [S.S.C. JE Mechanical Exam 27.10.2020]

Correct Answer: (c) Copper
Solution:Copper is a metal commonly used to make cooking vessels due to its good thermal conductivity, allowing heat to spread evenly for efficient cooking. It's also relatively durable and has some antimicrobial properties. Barium, sodium, and potassium are not suitable for cooking vessels due to their reactivity or other properties.

2. Which one of the following is not an example of an allotrope? [S.S.C. Online Graduate Level (T-I) 11.08.2017]

Correct Answer: (d) Steel
Solution:Steel is NOT an example of an allotrope. Allotropes are different structural modifications of an element in the same physical state. Diamond and graphite are allotropes of carbon, and ozone (O₃) is an allotrope of oxygen (O₂). Steel, on the other hand, is an alloy, which is a mixture of metals or a metal with a non-metal (primarily iron with carbon, often including other elements like nickel and chromium). While iron itself has allotropes (alpha, gamma, delta), steel as a mixture is not an allotrope.  

3. Which of the following is not used in the manufacture of stainless steel? [S.S.C. Online MTS (F-I) 16.06.2019]

Correct Answer: (b) Sulfur
Solution: Sulfur is generally NOT used in the manufacture of stainless steel. Stainless steel is primarily an alloy of iron with a minimum of 10.5% chromium. Nickel and carbon are also often added to enhance properties like corrosion resistance, strength, and formability. Sulfur is usually considered an impurity in steel and can negatively affect its weldability and ductility.

4. When is mixed with nickel and chromium, we get stainless steel. [S.S.C. JE Electrical Exam 10.12.2020]

Correct Answer: (c) Iron
Solution:Iron is mixed with nickel and chromium to produce stainless steel. The addition of chromium provides corrosion resistance, while nickel enhances ductility and strength.

5. Gold is alloyed with which metal to make it harder? [S.S.C. Online MTS (T-I) 3.10.2017]

Correct Answer: (a) Cu
Solution:Cu (Copper) is often alloyed with gold to increase its hardness and durability for jewelry and other applications. Pure gold is quite soft and easily scratched.

6. Which of the following is NOT a electrical insulator? [S.S.C. JE Electrical Exam 24.03.2021]

Correct Answer: (c) Gold
Solution: Gold is NOT an electrical insulator; it is an excellent conductor of electricity. Diamond, rubber, and glass are all good electrical insulators, meaning they resist the flow of electric current.

7. Which alloy contains lead and tin? [S.S.C. Online Constable GD 3.03.2019]

Correct Answer: (d) Solder
Solution:Solder is an alloy that contains lead and tin as its primary components. It is used for joining metal pieces together.

8. Identify the alloy among the following of which lead is a component. [S.S.C. Online M.T.S. (T-I) 26.10.2021]

Correct Answer: (a) Solder
Solution:Solder is the alloy among the options listed that contains lead as a component. Constantan is a copper-nickel alloy, Nickel is a pure element (or can be an alloy primarily composed of nickel), and Alnico is an alloy containing aluminum, nickel, and cobalt with iron, and sometimes copper.

9. The mineral named 'Calaverite' is a telluride mineral containing: [S.S.C. Online MTS (T-I) 20.10.2021]

Correct Answer: (c) Gold
Solution:Gold is a primary component of the telluride mineral named 'Calaverite'. Calaverite is a gold telluride with the chemical formula AuTe₂. It can also contain some silver.

10. Gunmetal is made of which alloy? [S.S.C. Online MTS (T-I) 2.08.2019]

Correct Answer: (a) Copper, Tin, Zinc
Solution:Copper, Tin, Zinc is the alloy composition of gunmetal. Gunmetal is an alloy consisting of 88% copper, 10% tin, and 2% zinc.  While the exact proportions can vary, these are the main metals that make up gunmetal. It was historically used for making cannons but now has other applications due to its corrosion resistance and strength.
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