1. Which property is due to delocalised electrons?
- Conductivity
- Brittleness
- Insolubility
- Softness
Answer: A) Conductivity
MCQs / Chemistry / Metallic bonding & alloys
Metallic bonding & alloys MCQs — Chemistry
27 multiple-choice questions on Metallic bonding & alloys from Chemistry, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.
2. Copper is both
- malleable and conductive
- brittle and insulating
- soft and non-conductive
- ionic and conductive
Answer: A) malleable and conductive
3. A metal conducts electricity because it contains
- mobile ions
- delocalised electrons
- molecules
- protons
Answer: B) delocalised electrons
4. Metallic bonding consists of
- positive ions and delocalised electrons
- molecules only
- oppositely charged ions
- atoms sharing electrons
Answer: A) positive ions and delocalised electrons
Explanation: Metallic bonding is the attraction between a lattice of positive metal ions and a 'sea' of delocalised electrons.
5. Which statement about metals is correct?
- They contain molecules
- They conduct electricity due to mobile electrons
- They are brittle
- They have low melting points
Answer: B) They conduct electricity due to mobile electrons
6. Brass is
- an element
- a compound
- an alloy
- a molecule
Answer: C) an alloy
Explanation: Brass is a mixture of copper and zinc — an alloy, not a compound.
7. Which statement is incorrect?
- Metals contain delocalised electrons
- Metals conduct electricity
- Metallic bonding involves positive ions
- Metals contain giant ionic lattices
Answer: D) Metals contain giant ionic lattices
8. Why is aluminium malleable?
- Layers of ions can slide
- It contains molecules
- It is ionic
- It has weak covalent bonds
Answer: A) Layers of ions can slide
9. The attraction in a metal is between
- molecules and molecules
- positive ions and electrons
- ions and ions only
- atoms and molecules
Answer: B) positive ions and electrons
10. Metals are good conductors because
- ions move freely
- electrons are delocalised
- molecules vibrate
- atoms rotate
Answer: B) electrons are delocalised
11. Which diagram would represent a metal?
- Positive ions surrounded by electrons
- Molecules separated by spaces
- Alternating positive and negative ions
- Covalent network of atoms
Answer: A) Positive ions surrounded by electrons
12. Copper has
- a giant metallic structure
- a giant ionic structure
- simple molecules
- covalent molecules
Answer: A) a giant metallic structure
13. Which particles move to carry electrical charge in a metal?
- Protons
- Neutrons
- Electrons
- Positive ions
Answer: C) Electrons
14. An alloy is
- a mixture containing a metal and other element(s)
- a pure metal
- an ionic compound
- a covalent compound
Answer: A) a mixture containing a metal and other element(s)
Explanation: An alloy is a mixture of a metal with one or more other elements, usually to make it harder or more resistant to corrosion.
15. Which row correctly matches each substance with its type of bonding?
- Sodium – Metallic
- Chlorine – Covalent
- Sodium chloride – Ionic
- All of these
Answer: D) All of these
Explanation: Sodium is a metal (metallic), chlorine is a non-metal molecule (covalent), sodium chloride is a metal + non-metal (ionic). All three rows are correct.
16. When a metal is hammered, it changes shape because
- layers slide past one another
- ions disappear
- electrons are lost
- molecules break apart
Answer: A) layers slide past one another
17. Which statement describes metallic bonding?
- Positive ions in a sea of electrons
- Molecules joined by weak forces
- Oppositely charged ions attract
- Atoms share electrons
Answer: A) Positive ions in a sea of electrons
18. Which substance contains positive ions surrounded by electrons?
- Magnesium
- Water
- Carbon dioxide
- Sodium chloride solution
Answer: A) Magnesium
19. In a metallic structure, the large particles are
- electrons
- positive metal ions
- molecules
- negative ions
Answer: B) positive metal ions
20. What is meant by a delocalised electron?
- Shared between two atoms only
- Free to move throughout the metal
- Stuck to one atom
- Lost from the metal
Answer: B) Free to move throughout the metal
21. Which property of iron is due to metallic bonding?
- Conductivity
- Low melting point
- Brittleness
- Insolubility
Answer: A) Conductivity
22. Why are metals malleable?
- Layers of ions can slide over each other
- Weak covalent bonds break
- Molecules move freely
- Ions leave the structure
Answer: A) Layers of ions can slide over each other
Explanation: Metallic bonds are non-directional, so layers of ions can slide over each other without the structure breaking.
23. Which metal property is explained by metallic bonding?
- Malleability
- Transparency
- Solubility in water
- Low density
Answer: A) Malleability
24. Which substance shows metallic bonding?
- Aluminium
- Water
- Carbon dioxide
- Chlorine
Answer: A) Aluminium
25. What is a similarity between metals and ionic compounds?
- Both contain positive ions
- Both contain molecules
- Both have weak forces
- Both are gases
Answer: A) Both contain positive ions
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