Learning these 15 MCQs on Metals and Non-Metals is essential for your Class 10 chemistry. 📚 They cover key concepts that will not only help you ace your exams but also strengthen your understanding of the subject. 🧠Plus, it’s a fun way to test your knowledge and build confidence! 🚀 So, dive in, and let’s make chemistry a breeze! 💪
1. Which of the following metal is obtained by electrolytic reduction process?
- (a) Cu
- (b) Ag
- (c) Fe
- (d) Al
Answer: (d) Al
Explanation: Aluminum (Al) is obtained by the electrolytic reduction of alumina (Al₂O₃) using the Hall-Héroult process. The other metals listed can be extracted through other methods, like smelting or chemical reduction.
2. Cinnabar is an ore of which metal?
- (a) Tin
- (b) Aluminium
- (c) Magnesium
- (d) Mercury
Answer: (d) Mercury
Explanation: Cinnabar (HgS) is the principal ore of mercury. It is a bright red mineral composed of mercury sulfide.
3. Which of the following does not conduct electricity?
- (a) Solid KCl
- (b) Fused KCl
- (c) Aluminium
- (d) Iron
Answer: (a) Solid KCl
Explanation: Solid potassium chloride (KCl) does not conduct electricity because its ions are not free to move. In its molten state (fused KCl) or when dissolved in water, KCl does conduct electricity due to the mobility of its ions.
4. Which of the following is not an ionic compound?
- (a) Sodium oxide
- (b) Carbon tetrachloride
- (c) Magnesium chloride
- (d) Sodium chloride
Answer: (b) Carbon tetrachloride
Explanation: Carbon tetrachloride (CClâ‚„) is a covalent compound, not an ionic one. It consists of covalently bonded atoms of carbon and chlorine.
5. Which metal is associated with haemoglobin?
- (a) Calcium
- (b) Aluminium
- (c) Magnesium
- (d) Iron
Answer: (d) Iron
Explanation: Iron is a key component of hemoglobin, the protein in red blood cells that carries oxygen throughout the body.
6. The liquid non-metal is
- (a) Carbon
- (b) Hydrogen
- (c) Bromine
- (d) Chlorine
Answer: (c) Bromine
Explanation: Bromine is the only non-metal that is a liquid at room temperature.
7. Choose the correct option for brass:
- (a) Cu-Hg
- (b) Cu-Mg
- (c) Cu-Fe
- (d) Cu-Zn
Answer: (d) Cu-Zn
Explanation: Brass is an alloy made of copper (Cu) and zinc (Zn).
8. The colour of Iron(II) sulphate solution is:
- (a) Blue
- (b) Yellow
- (c) Green
- (d) Orange
Answer: (c) Green
Explanation: Iron(II) sulfate solution typically has a pale green color.
9. Electric wires have a coating of insulating material. The material, generally used is:
- (a) Graphite
- (b) Phosphorus
- (c) PVC
- (d) Bromine
Answer: (c) PVC
Explanation: Polyvinyl chloride (PVC) is commonly used as an insulating material for electric wires due to its excellent electrical insulation properties.
10. Ore ‘X’ of metal ‘M’ releases Carbon dioxide on heating. ‘X’ can be:
- (a) MNO₃
- (b) MCO₃
- (c) MSO₃
- (d) MSOâ‚„
Answer: (b) MCO₃
Explanation: Metal carbonates (MCO₃) decompose upon heating to release carbon dioxide (CO₂) and the corresponding metal oxide.
11. Which of these melts easily?
- (a) Steel
- (b) Diamond
- (c) Stainless steel
- (d) Solder
Answer: (d) Solder
Explanation: Solder is an alloy that melts at a relatively low temperature, making it ideal for joining metal parts together in electronics and plumbing.
12. PbO(s) + C(s) → Pb(s) + CO(g). The role of ‘C’ in the above reaction is of a:
- (a) Catalyst
- (b) Reducing agent
- (c) Oxidizing agent
- (d) Solvent
Answer: (b) Reducing agent
Explanation: In this reaction, carbon (C) acts as a reducing agent by donating electrons to lead oxide (PbO), thereby reducing it to lead (Pb).
13. Which of the following reaction does not occur?
- (a) Lead metal + silver nitrate solution
- (b) Lead metal + zinc sulphate solution
- (c) Magnesium metal + copper sulphate solution
- (d) Copper metal + silver nitrate solution
Answer: (b) Lead metal + zinc sulphate solution
Explanation: Lead cannot displace zinc from zinc sulfate solution because zinc is more reactive than lead.
14. Copper is used in silver coins to:
- (a) Reduce melting point
- (b) Increase conductivity
- (c) Reduce solubility
- (d) Increase hardness
Answer: (d) Increase hardness
Explanation: Copper is added to silver in coins to increase the hardness and durability of the coins.
15. Which of the following property is not shown by metals?
- (a) Electrical conduction
- (b) Sonorous in nature
- (c) Dullness
- (d) Ductility
Answer: (c) Dullness
Explanation: Metals are typically shiny, not dull, which is a characteristic of non-metals. They are good conductors of electricity, sonorous, and ductile.