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 ___________________.
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Ans:
Heat and electricity
Q2: When we beat the aluminium wire its shape changed, which property of metals is shown by this?
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Ans:
Property of malleability of metals.
Q3: When we beat a coal its shape do not changed, rather is break down into small pieces, why so?
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Because coal is non-metal and it is not malleable.
Q4: Give examples of some metals and non-metals.
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Examples of metals: iron, magnesium, copper, calcium etc.
Examples of non-metals: sulphur, carbon, phosphorus, oxygen etc.
Q5: Non- metals are bad conductor of electricity. Give example to support this statement.
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Handles of metallic pan or other cookwares are made of wood or plastics which are non-metal and bad conductor of electricity.
Q6: Which of the following are good conductor of electricity and which one is bad conductor?
An iron pan
an aluminium utensil
wood
plastic handle of a pan
nail
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Ans:
Good conductor: An iron pan, an aluminium utensil and nail
Bad Conductor: wood and plastic handle of a pan
Q7: Why we can see wires of aluminium and copper but not of coal or wood?
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Because wires of aluminium and coppers are made on the basis of property of metals called ductile, since wood and coal are non-metals and they don�t show this property so it is not possible to make wires of these materials.
Q8: Why bells in temples are made up of metal?
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Because metals produce ringing sounds are are said to be sonorous.
Q9: Which of the two will produce ringing sound a metallic box or a wooden box?
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a metallic box
Q10: What is sonorous?
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Metals are called sonorous because they produce ringing sounds.
Q11: Define ductility.
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Ductility is the property of metal by which it can be made into thin wires.
Q12: Define malleability.
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The property of metals by which it can be can be made into thin sheets is called malleability.
Q13: Sulphur is ductile or not?
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No
Q14: Which one of the two is malleable oxygen or calcium?
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Calcium
Q15: Name the metal which is found in liquid state at room temperature?
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Mercury
Q16: Name the metal which is soft and can be cut easily with a knife.
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sodium and potassium
Q17: Which of the two is malleable, phosphorus or iron?
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Iron
Q18: Metals like gold, silver, platinum etc. retain their lustre because they do not react with air, water or _________
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Acids
Q19: What do you mean by noble metals?
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Metals like gold, silver, platinum etc. retain their lustre because they do not react with air, water or acids, thus they are called noble metals.
Q20: Why 24 carat gold is mixed with some silver or copper to make ornaments?
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24 carat gold is very soft and cannot be used for making ornaments, thus it is mixed with some silver or copper to make it hard.
Q21: Metal reacts with oxygen to form__________________
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Ans:
Metallic oxides
Q22: Tick the wright answer.
Metal reacts with water to form
Oxide
Chloride
Hydroxide
None of these
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Ans:
Hydroxides
Q23: Complete the following reaction of magnesium and oxygen