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NCERT Class VIII Science Solutions: Chapter 4 - Materials: Metals and Non-Metals Part 1
Question 1:
Which of the following can be beaten into thin sheets?
- Zinc
- Phosphorus
- Sulphur
- Oxygen
Answer:
A. Zinc
As Zinc is a metal and metal has property of malleability (Can be converted in sheet by beating) . Rest of these are non-metals.
Question 2:
Which of the following statements is correct?
- All metals are ductile.
- All non-metals are ductile.
- Generally, metals are ductile.
- Some non-metals are ductile.
Answer:
C. Generally, metals are ductile.
Mercury (metal) is liquid at room temperature and cannot be drawn into wires. Therefore, it is non-ductile. So the option (a) is incorrect. Not a single non-metal is ductile, so option (b) and (d) are incorrect.
Question 3:
Fill in the blanks:
- Phosphorus is very ________ non-metal.
- Metals are ________ conductors of heat and ________.
- Iron is ________ reactive than copper.
- Metals react with acids to produce ________ gas.
Answer:
- Phosphorus is very reactive non-metal.
- Metals are good conductors of heat and electricity.
- Iron is more reactive than copper.
- Metals react with acids to produce Hydrogen gas.
Question 4:
Mark βTβ if the statement is true and βFβ if it is false.
- Generally, non-metals react with acids. ()
- Sodium is a very reactive metal. ()
- Copper displaces zinc from zinc sulphate solution. ()
- Coal can be drawn into wires. ()
Answer:
- Generally, non-metals react with acids. (False)
Generally, metals react with acids and release gas.
- Sodium is a very reactive metal. (True)
Sodium, Potassium, Calcium etc. , are very reactive metals.
- Copper displaces zinc from zinc sulphate solution. (False)
The reactivity of zinc is higher than copper. So, copper cannot displace zinc from zinc sulphate solution.
- Coal can be drawn into wires. (False)
- Coal is a non-metal, so it is non ductile.