NCERT Solution for Class 8 Science: Metals and Nonmetals
In NCERT solution of science for class 8 chapter 4 named Metals & Non-metals provides questions, answers, solve paper in pdf like form. In class 8 science , solution get all about metal and non-metals.
Question 1:
Which of the following can be beaten into thin sheets? (a) Zinc (b) Phosphorus (c) Sulphur (d) Oxygen
Answer 1: (a) Zinc can be beaten into thin sheets.
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 2:
(c) Generally, metals are ductile.
Question 3:
Fill in the blanks:
(a) Phosphorus is 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 3:
(a) Phosphorus is very reactive non-metal.
(b) Metals are good conductors of heat and electricity.
(c) Iron is more reactive than copper.
(d) Metals react with acids to produce Hydrogen gas.
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 zinc sulphate solution. ( )
(d) Coal can be drawn into wires. ( )
Answer 4:
(a) False
Correct Statement: Generally, metals react with acids.
(b) True
(Since sodium light at the top of reactivity series)
(c) False.
Correct statement: zinc can displaces copper from copper sulphate.
Another card statement: copper cannot displaces zinc from zinc sulredphate.
(d) False.
(Cool that is carbon is a non metal which is non ductile).
Question 5:
Some properties are listed in the following Table.
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 6:
(a) the metal aluminium is highly malleable that is can makes fine sheet from it. Moreover aluminium is not react with food. Hence, aluminium foil is used to cover food
(b) Since, metals are good conductors of heat and electricity. Therefore, metals are used to make immersion rods for heating liquids.
(c) in chemical reactivity series zinc lie above the copper. When copper is less reactive than zinc and unable to displace zinc from zinc sulphate
(d) Since, Sodium and potassium live at the top of chemical reactivity series, they are very reactive elements. They easily react with moisture and carbon dioxide present in air and catch fire. To prevent this sodium and potassium kept under kerosene.
Question 7:
Can you store lemon pickle in an aluminium utensil? Explain.
Answer 7:
Aluminium is an active metal and lie above hydrogen in reactivity series. So it react with acid that is with lemon pickle and spoil it.
Question 8:
In the following Table some substances are given in Column I. In Column II some uses are given. Match the items in column I with those in Column II.
NCERT Solution for Class 8 Science: Metals and Nonmetals
Question 9:
What happens when
(a) Dilute sulphuric acid is poured on a copper plate?
(b) Iron nails are placed in copper sulphate solution? Write word equations of the reactions involved.
Answer 9:
(a) Copper does not react with dilute sulphuric acid.
(b) since iron lie above copper in reactivity series, iron is more active than copper. Therefore, iron displaces copper from copper sulphate and forms iron sulphate and 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 word equations of all the reactions taking place in this process.
Answer 10:
(a) Add some water in the test tube in which gas is collected. Now, cover the test tube. Shake it well. Then using blue and red litmus paper test the gas is acidic or basic in nature. If it turns blue Litmus red then the cash is acidic in nature.
(b) when charcoal that is carbon burns in oxygen it forms carbon dioxide.
carbon. + Oxygen = carbon dioxide
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. 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 in weight?
Answer 11:
The goldsmith polish the old jewelry by putting it into a acid called aqua regia.Aqua regia dissolve the upper visible layer and exposed the inner shiny layer. As a result, the jewelry become shiny but its weight is reduced.
Question 1:
Which of the following can be beaten into thin sheets? (a) Zinc (b) Phosphorus (c) Sulphur (d) Oxygen
Answer 1: (a) Zinc can be beaten into thin sheets.
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 2:
(c) Generally, metals are ductile.
Question 3:
Fill in the blanks:
(a) Phosphorus is 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 3:
(a) Phosphorus is very reactive non-metal.
(b) Metals are good conductors of heat and electricity.
(c) Iron is more reactive than copper.
(d) Metals react with acids to produce Hydrogen gas.
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 zinc sulphate solution. ( )
(d) Coal can be drawn into wires. ( )
Answer 4:
(a) False
Correct Statement: Generally, metals react with acids.
(b) True
(Since sodium light at the top of reactivity series)
(c) False.
Correct statement: zinc can displaces copper from copper sulphate.
Another card statement: copper cannot displaces zinc from zinc sulredphate.
(d) False.
(Cool that is carbon is a non metal which is non ductile).
Question 5:
Some properties are listed in the following Table.
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 6:
(a) the metal aluminium is highly malleable that is can makes fine sheet from it. Moreover aluminium is not react with food. Hence, aluminium foil is used to cover food
(b) Since, metals are good conductors of heat and electricity. Therefore, metals are used to make immersion rods for heating liquids.
(c) in chemical reactivity series zinc lie above the copper. When copper is less reactive than zinc and unable to displace zinc from zinc sulphate
(d) Since, Sodium and potassium live at the top of chemical reactivity series, they are very reactive elements. They easily react with moisture and carbon dioxide present in air and catch fire. To prevent this sodium and potassium kept under kerosene.
Question 7:
Can you store lemon pickle in an aluminium utensil? Explain.
Answer 7:
Aluminium is an active metal and lie above hydrogen in reactivity series. So it react with acid that is with lemon pickle and spoil it.
Question 8:
In the following Table some substances are given in Column I. In Column II some uses are given. Match the items in column I with those in Column II.
Question 9:
What happens when
(a) Dilute sulphuric acid is poured on a copper plate?
(b) Iron nails are placed in copper sulphate solution? Write word equations of the reactions involved.
Answer 9:
(a) Copper does not react with dilute sulphuric acid.
(b) since iron lie above copper in reactivity series, iron is more active than copper. Therefore, iron displaces copper from copper sulphate and forms iron sulphate and 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 word equations of all the reactions taking place in this process.
Answer 10:
(a) Add some water in the test tube in which gas is collected. Now, cover the test tube. Shake it well. Then using blue and red litmus paper test the gas is acidic or basic in nature. If it turns blue Litmus red then the cash is acidic in nature.
(b) when charcoal that is carbon burns in oxygen it forms carbon dioxide.
carbon. + Oxygen = carbon dioxide
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. 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 in weight?
Answer 11:
The goldsmith polish the old jewelry by putting it into a acid called aqua regia.Aqua regia dissolve the upper visible layer and exposed the inner shiny layer. As a result, the jewelry become shiny but its weight is reduced.
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NCERT Solution for Class 8 Science: Metals and Nonmetals
