Materials: Metals and Non-Metals
Q1. Fill in the blanks.
Phosphorus is very reactive
Metals are good conductors of heat
Iron is more reactive than copper.
Metals react with acids to produce hydrogen
Most non-metals are bad conductors
Metals are lustrous.
Some metals react with water to produce
metal hydroxides and hydrogen gas.
Metals can be distinguished from non-metals
on the basis of their physical and chemical properties.
A sample of an element contains only one
kind of atoms.
Generally, non-metals react with acids. False
Sodium is a very reactive metal. True
Copper displaces zinc from zinc sulphate
Coal can be drawn into wires. False
Metals are harder than non-metals. True
Metal reacts with oxygen to form metallic oxides.
Q3. Which is more reactive iron or copper?
Q4. Which is less reactive sodium or gold?
Q5. Which one of the two is malleable oxygen or calcium?
Q6. Which of the two is malleable, phosphorus or iron?
Q7. Which metal is used to make foil to wrap food items?
Q8. Which metal foil is used to decorate sweets?
Ans. Silver foil used for decorating sweets.
Q9. The shape of the iron nail and the aluminium wire changes on
beating. Which property of metals is shown by
Q10. What is atom?
Ans. The smallest unit of an element is atom.
Q11. How many naturally occurring elements are there?
Ans. There are no more than 92 naturally occurring
Q12. Why metals are said to be sonorous?
Why are metals sonorous?
metals produce ringing sounds, they are said to be sonorous.
Q13. Why non-metals cannot be drawn into wires?
Non-metals are not ductile. Therefore they cannot be drawn into wires.
Q14. Which of the following can be beaten into thin sheets?
(a) Zinc (b) Phosphorus (c) Sulphur (d) Oxygen
Q15. Which of the following statements is correct?
(a) All metals are ductile.
(b) All non-metals are ductile.
(c) Generally, metals are ductile.
(d) Some non-metals are ductile.
Generally, metals are ductile.
Q16. Complete the following displacement reaction:
Copper sulphate + ______ -----> Zinc sulphate + ______?
Ans. Copper sulphate + zinc -----> Zinc sulphate +
Q17. Name the non-metal essential for our life, which all living
being inhale during breathing.
Q18. Which of the two will produce ringing sound a metallic box
or a wooden box and why?
Ans. A metallic box will produce ringing sound because
metals are sonorous.
Q19. There are two materials A and B. On hammering A is
flattened, but B breaks. Which one is a metal?
Ans. A is a metal because it flattens, i.e., it is
Q20. Name two soft metals which can be cut with a knife.
What are soft metals that can be cut with a knife?
Why can sodium and potassium be cut with a knife?
Which metals can be cut by a knife?
Ans. Metals like sodium and potassium are soft and can
be cut with a knife.
Q21. Give some examples of non-metals.
The examples of non-metals are sulphur, carbon, oxygen, phosphorus, etc.
Q22. Give some examples of metals.
examples of metals are iron, copper, aluminium, calcium, magnesium, etc.