SSC CGL Science – Metals, Non-Metals & Metallurgy – Level 3 · Challenge
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Below H (no H₂) but above Ag → copper.
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SSC CGL Science – Metals, Non-Metals & Metallurgy – Level 3 · Challenge – 8 questions, subject: General Science. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.
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1.
Arrange in orderArrange in decreasing order of reactivity: Fe, Na, Cu, Al.
Correct Answer: D [Na > Al > Fe > Cu]
Explanation:
Answer: Na > Al > Fe > Cu. K Na Ca Mg Al Zn Fe Pb H Cu …
2.
The percentage of iron in pure magnetite, Fe₃O₄ (Fe = 56, O = 16), is about:
Correct Answer: B [72.41%]
Explanation:
Fe₃O₄ = 168 + 64 = 232; 168 ÷ 232 × 100 ≈ 72.41%.
3.
Statement-basedWhich are correct?
I. Calamine is calcined.
II. Zinc blende is roasted.
III. Zinc oxide is reduced with carbon.
I. Calamine is calcined.
II. Zinc blende is roasted.
III. Zinc oxide is reduced with carbon.
Correct Answer: C [All of I, II and III]
Explanation:
ZnCO₃ calcined; ZnS roasted; ZnO + C → Zn + CO.
4.
Which metal is obtained by electrolysis of its molten chloride, because carbon cannot reduce its oxide?
Correct Answer: D [Sodium]
Explanation:
Answer: Sodium. Top metals need electrolysis.
5.
In the extraction of iron, limestone is added to the blast furnace in order to:
Correct Answer: A [remove silica gangue as slag]
Explanation:
Answer: remove silica gangue as slag. CaO + SiO₂ → CaSiO₃ (slag).
6.
In the Hall–Héroult process, cryolite is added to alumina to:
Correct Answer: B [lower the melting point and increase conductivity]
Explanation:
Alumina alone melts above 2000 °C.
7.
The percentage of copper in pure copper glance, Cu₂S (Cu = 63.5, S = 32), is about:
Correct Answer: A [80%]
Explanation:
Answer: 80%. 127 ÷ 159 × 100 ≈ 79.9%.
8.
A metal X does not react with dilute HCl but displaces silver from silver nitrate solution. X is most likely:
Correct Answer: C [Copper]
Explanation:
Below H (no H₂) but above Ag → copper.
➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 General Science book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-general-science
📘 SSC CGL 2026 – General Science (Tier I + Tier II)
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