Class 10 chemistry MCQs with answers are provided here for chapter 3 Metals and Non-metals. These MCQs are based on the CBSE board curriculum and correspond to the most recent Class 10 chemistry syllabus. Students who wish to do well in their CBSE board exams should study MCQ Questions for Class 10 Science with Answers PDF Free Download. Students can boost their board exam scores by practising chapter-by-chapter CBSE Class 10 Science Multiple Choice Questions with Answers.
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Class 10 Metals and Non-metals MCQs
1. The primary ore of aluminium is which of the following?
a) Kaolinite
b) Bauxite
c) Malachite
d) Cinnabar
Answer: b
Explanation: Aluminium’s primary resource is bauxite. Bauxite is a combination of hydrated iron oxide and hydrated aluminium oxide with the chemical formula Al2O3.2H2O. Kaolinite is another aluminium resource, although it is less abundant than bauxite, and extracting aluminium from kaolinite is a difficult and expensive procedure.
2. Which of the following is not an appropriate ore for iron extraction?
a) Hematite
b) Magnetite
c) Siderite
d) Iron Pyrites
Answer: d
Explanation: FeS2 is the chemical formula for iron pyrite. Because iron pyrite is exothermic and poses a safety risk in mines, it is more cost-effective to recover iron from other ores such as magnetite and hematite. Pyrites are generally unstable, and they have the potential to transform into sulphurous minerals.
3. Cinnabar is used to extract which metal?
a) Zinc
b) Copper
c) Iron
d) Mercury
Answer: d
Explanation: Cinnabar, commonly known as cinnabarite, is a natural and significant mercury ore having the chemical formula HgS. Cinnabar is a hazardous ore that cannot be handled directly due to the presence of high levels of mercury.
4. Aluminium does not have which of the following properties?
a) Aluminium is a poor conductor of heat and electricity
b) Aluminium is light in weight
c) It readily dissolves in HCl
d) Aluminium is highly resistant to corrosion
Answer: a
Explanation: Aluminium is a light metal that dissolves easily in HCl. Aluminium has a strong corrosion resistance and is a good heat and electricity conductor.
5. Which of the following isn’t a cobalt property?
a) Cobalt is a lustrous white metal
b) It is attacked by alkalies
c) Cobalt is malleable
d) Cobalt is ductile
Answer: b
Explanation: Cobalt is a beautiful white metal that resists alkali assault. Cobalt is malleable and ductile. Cobalt has a specific gravity of 8.8.
6. Which one of the following is not a zinc ore?
a) Limonite
b) Zincite
c) Calamine
d) Franklinite
Answer: a
Explanation: Zinc ores include zincite, franklinite, zinc blende, and calamine, among others. Galvanization is a procedure that uses zinc. It’s also employed in the production of electric cells and alloys.
7. When magnesium is alloyed with which of the following elements, the tendency to break under stress is not reduced?
a) Aluminum
b) Silicon
c) Zinc
d) Copper
Answer: d
Explanation: Copper is the correct answer. Magnesium is alloyed with aluminium, silicon, and zinc to minimise the tendency of magnesium to break under stress.
8. Copper and zinc alloy is known as __________
a) Brass
b) Bronze
c) Duralumin
d) Nichrome
Answer: a
Explanation: Brass is a copper-zinc alloy with a substitutional composition. It has several desirable characteristics, including a low melting point, workability, electrical and thermal conductivity, corrosion resistance, and so on.
9. The main component of Duralumin alloy is ____________
a) Copper
b) Nickel
c) Iron
d) Aluminum
Answer: d
Explanation: Duralumin is an age-hardenable aluminium alloy containing primarily copper, manganese, and magnesium. Duralumin is a lightweight alloy that is frequently used in the aerospace sector.
10. In calamine, what is the zinc concentration?
a) 98 percent
b) 94 percent
c) 86 percent
d) 74 percent
Answer: a
Explanation: Calamine has a chemical composition of ZnCO3 with a zinc content of 98 percent. It is abundant and can be manufactured artificially in laboratories. It is used in the treatment of pain and itching.
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