NCERT Solution For Class 8 Science, Chapter 4 – Materials: Metals and Non-Metals

NCERT Solutions is known as an extremely helpful resource for preparing for the exam. Takshila Learning provides its learners with access to a wealth of NCERT problems and their solutions. CBSE Class 8 Science NCERT Solutions are built by subject matter experts, so be sure to train learners for a good grade. The questions set out in the NCERT Books are prepared in compliance with the requirements of the CBSE.

NCERT Solution For Class 8 Science, Chapter 4 – Materials: Metals and Non-Metals provides us with all-inclusive information on all concepts. As students would have to learn the basics about the subject in class 8, this curriculum for class 8 is comprehensive study material, which explains the concepts in a great way.

Question 1.
Which of the following can be beaten into thin sheets?
(a) Zinc
(b) Phosphorus
(c) Sulphur
(d) Oxygen

Answer:
(a) Zinc

Question 2.
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.

Answer:
(c) Generally, metals are ductile

Question 3.
Fill in the blanks.
(a) Phosphorus is a very ____ non-metal.
(b) Metals are _____ conductors of heat and _____
(c) Iron is ______ reactive than copper.
(d) Metals react with acids to produce ______ gas.

Answer:
(a) reactive
(b) good, electricity
(c) more
(d) hydrogen

Question 4.
Mark ‘T’ if the statement is true and ‘F’ if it is false.
(a) Generally, non-metals react with acids.
(b) Sodium is a very reactive metal.
(c) Copper displaces zinc from a zinc sulphate solution.
(d) Coal can be drawn into wires.

Answer:
(a) False
(b) True
(c) False
(d) False

Question 5.
Some properties are listed in the following table. Distinguish between metals and non-metals on the basis of these properties.

Answer:

Question 6.
Give reasons for the following.
(a) Aluminium foils are used to wrap food items.
(b) Immersion rods for heating liquids are made up of metallic substances.
(c) Copper cannot displace zinc from its salt solution.
(d) Sodium and potassium are stored in kerosene.

Answer:
(a) Aluminium is highly flexible and it can be easily beaten in sheets to make its foil for wrapping and draping purposes and is also soft and does not react with food items, that is why aluminium foils are used to wrap food items.
(b) Immersion rods are made up of metallic substances because metals are fair conductors of heat and electricity, they also get hot extremely soon on the passage of electric current and warm the water.
(c) Copper is less reactive than zinc, so it cannot displace zinc from its solution.
(d) Sodium and potassium are highly reactive, so they are stocked in kerosene.

Question 7.
Can you store the lemon pickle in an aluminium utensil? Explain.

Answer:
No, we cannot store the lemon pickles in an aluminium utensil because aluminium is a metal and metals readily respond with acids to generate hydrogen. When aluminium comes in connection with lemon, which is acidic, it would respond to give hydrogen and the pickle will be spoiled.

Question 8.
Match the substances given in column A with their uses given in column B.

Answer:
(i) (d)
(ii) (e)
(iii) (c)
(iv) (f)
(v) (b)
(vi) (a)

Question 9.
What happens when
(a) Dilute sulphuric acid is poured on a copper plate?
(b) Iron nails are placed in a copper sulphate solution?
Write word equations of the reactions involved.

Answer:
(a) No reaction because copper is very less reactive.
(b) Iron being more reactive than copper will renovate copper from its solution and brown coating of copper is placed on the iron nails. Also, the blue color turns green.
Iron + Copper sulphate (solution) → Iron sulphate (solution) + Copper

Question 10.
Saloni took a piece of burning charcoal and collected the gas evolved in a test tube.
(a) How will she find the nature of the gas?
(b) Write down the word equations of all the reactions taking place in this process.

Answer.

(a) She can find the nature of the gas by using a wet litmus paper. After bringing the litmus paper in contact with the gas, if it turns the blue litmus paper into red, it is acidic. Similarly, if it turns the red litmus into blue, it is basic.
(b) (i) Carbon + Oxygen → Carbon dioxide
(ii) Carbon dioxide + Lime water → Milky

Question 11.
One day Reeta went to a jeweller’s shop with her mother. Her mother gave old gold jewellery to the goldsmith to polish. The next day when they brought the jewellery back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss of weight?

Answer:
The gold jewellery is dipped into an acidic solution called aqua regia (a mixture of hydrochloric acid and nitric acid) for polishing. On dipping the gold jewellery in the acid solution, the outer layer of gold dissolves and the inner shiny layer appears. This causes a slight loss in weight.

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