CBSE Science Class 8

Materials: Metals and Non- Metals

Materials: Metals and Non- Metals - Chapter Wise CBSE Solved Question and Answer Based On NCERT

Very Short Q&A:

Q1: All metals are good conductor of __________ and ___________________.
View Answer
Q2: When we beat the aluminium wire its shape changed, which property of metals is shown by this?
View Answer
Q3: When we beat a coal its shape do not changed, rather is break down into small pieces, why so?
View Answer
Q4: Give examples of some metals and non-metals.
View Answer
Q5: Non- metals are bad conductor of electricity. Give example to support this statement.
View Answer
Q6: Which of the following are good conductor of electricity and which one is bad conductor?
  1. An iron pan
  2. an aluminium utensil
  3. wood
  4. plastic handle of a pan
  5. nail
View Answer
Q7: Why we can see wires of aluminium and copper but not of coal or wood?
View Answer
Q8: Why bells in temples are made up of metal?
View Answer
Q9: Which of the two will produce ringing sound a metallic box or a wooden box?
View Answer
Q10: What is sonorous?
View Answer
Q11: Define ductility.
View Answer
Q12: Define malleability.
View Answer
Q13: Sulphur is ductile or not?
View Answer
Q14: Which one of the two is malleable oxygen or calcium?
View Answer
Q15: Name the metal which is found in liquid state at room temperature?
View Answer
Q16: Name the metal which is soft and can be cut easily with a knife.
View Answer
Q17: Which of the two is malleable, phosphorus or iron?
View Answer
Q18: Metals like gold, silver, platinum etc. retain their lustre because they do not react with air, water or _________
View Answer
Q19: What do you mean by noble metals?
View Answer
Q20: Why 24 carat gold is mixed with some silver or copper to make ornaments?
View Answer
Q21: Metal reacts with oxygen to form__________________
View Answer
Q22: Tick the wright answer.

Metal reacts with water to form
  1. Oxide
  2. Chloride
  3. Hydroxide
  4. None of these
View Answer
Q23: Complete the following reaction of magnesium and oxygen

2 Mg + O2 ---> __________________
MgO+ H2O ---> ____________________
View Answer
Q24: Give example of this: Metals react with water to form metal hydroxides and hydrogen. Write the equation for this reaction.
View Answer
Q25: Complete the following equation:

Zinc reacts with dilute hydrochloric acid to form zinc chloride and hydrogen.
Zn + 2 HCl ---> ______ + H2
View Answer
Q26: Complete the following displacement reaction:

Copper sulphate + ______ -----> Zinc sulphate + ______
View Answer
Q27: State whether true of false

A less reactive metal can replace a more reactive metal, but a more reactive metal cannot replace a less reactive metal.
View Answer
Q28: State the uses of iron.
View Answer
Q29: Name the non-metal used in fertilizer to enhance the growth of plants.
View Answer
Q30: Name the non-metal essential for our life, which all living being inhale during breathing
View Answer
Q31: State the uses of aluminium.
View Answer
Q32: State the uses of gold and silver.
View Answer
Q33: What is corrosion?
View Answer
Q34: What is galvanisation?
View Answer
Q35: Complete the following reaction:

Rusting of iron is an oxidation reaction, which is takes place as
3Fe + O2 + _______ 3 FeO + H2
View Answer
Q36: Non-metals generally do not react with acids but metals react with acids and produce hydrogen gas that burns with a _____________ sound .
View Answer
Q37: Which is more reactive iron or copper?
View Answer
Q38: Which is less reactive sodium or gold?
View Answer
Q39: Sodium is very reactive metal, yes or no?
View Answer
Q40: Rusting of iron can be prevented by coating its surface with new iron metal, yes or no?
View Answer



Chapter 4 Materials: Metals and Non- Metals