CBSE Class 8 Science Materials Metals And Non Metals Worksheet Set A

Read and download free pdf of CBSE Class 8 Science Materials Metals And Non Metals Worksheet Set A. Students and teachers of Class 8 Science can get free printable Worksheets for Class 8 Science in PDF format prepared as per the latest syllabus and examination pattern in your schools. Standard 8 students should practice questions and answers given here for Science in Grade 8 which will help them to improve your knowledge of all important chapters and its topics. Students should also download free pdf of Class 8 Science Worksheets prepared by school teachers as per the latest NCERT, CBSE, KVS books and syllabus issued this academic year and solve important problems provided here with solutions on daily basis to get more score in school exams and tests

Materials Metals And Non Metals Class 8 Science Worksheet Pdf

Class 8 Science students should refer to the following printable worksheet in Pdf for Materials Metals And Non Metals in standard 8. This test paper with questions and answers for Grade 8 Science will be very useful for exams and help you to score good marks

Class 8 Science Worksheet for Materials Metals And Non Metals

Metals and non-Metals
Question 1. Which of the following can be beaten into thin sheets?
(a) Zinc (✓)    (b) Phosphorus    (c) Sulphur    (d) Oxygen
 
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.
 
Question 3 Fill in the blanks.
 
(a) Phosphorus is a 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. ( F)
(b) Sodium is a very reactive metal. ( T)
(c) Copper displaces zinc from zinc sulphate solution. ( F)
(d) Coal can be drawn into wires. ( F)
 
Question 5. Some properties are listed in the following Table. Distinguish between metals and non-metals on the basis of these properties.

8th.sci.eng.july.Aug 3

 

Question 6- Give reasons for the following.

(a) Aluminium foils are used to wrap food items. 
Ans- Because aluminium metal is malleable. Therefore, it can be beaten into thin foils. Also a layer of aluminium oxide on aluminium foil make it non reactive with food. 
 
(b) Immersion rods for heating liquids are made up of metallic substances. 
Ans- Because metals are good conductors of heat and electricity. 
 
(c) Copper cannot displace zinc from its salt solution. 
Ans- Because copper is less reactive metal than zinc. 
 
(d) Sodium and potassium are stored in kerosene. 
Ans- Because they are highly reactive elements. They can easily catch fire even when in contact with air. 

Question 7. Can you store pickle in an aluminium utensil? Explain. 
Answer- As lemon pickle contains acid so it cannot be stored in metallic vessels as acids readily react with metals to produce hydrogen gas. 

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

8th.sci.eng.july.Aug 4

 

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- (a) No reaction will take place because copper is less reactive than hydrogen. 
Copper sulphate + Sulphuric acid → No reaction 
(b) When iron nails are placed in copper sulphate solution, Cu is displaced by iron and solution turns green 
from blue. Chemical equation is as follows:
Iron nails + Copper sulphate solution → Iron sulphate + copper. 
                    (blue)                                  (light green) 
Question 10. Soloni 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- (a) When charcoal is burnt in air, carbon dioxide gas is evolved. This gas when passed into the lime water, turns it milky. This is the test for CO2 gas. 
(b) Carbon + Oxygen → Carbon dioxide gas. 

Question 11. One day Reeta went to a jeweller’s shop with her mother. Her mother gave an 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- In polishing, the jeweler put the gold Jewellery in a mild acid solution (aqua regia), which on reaction with acid goes into the solution. So, this process certain amount of gold is lost to the acidic solution. 

Question 12. Write differences between metals and non metals. 
Answer-

8th.sci.eng.july.Aug 5

 


ONE MARK MCQs 

1. Prabhsimran bought an idol (statue) made of copper from a fair, but he was astonished to see that the idol was covered with a light green coating on its surface after some days. The light green coating on the statue is mixture of - 
a) copper hydroxide and copper carbonate (✓)    b) copper sulphate and copper hydroxide 
c) copper sulphate and copper carbonate            d) none of these 

2. Name the metal which is used in thermometer and it is in liquid state at room temperature. 
a) Alcohol    b) Graphite    c) Mercury (✓)    d) Iron 

3. Tejinder accidentally left a non metal in open air, the non metal started burning. Name the non  metal? 
a) Mercury    b) Copper    c) Phosphorus (✓)    d) none of these 

4. In temples, bells are made up of metal instead of wood. Metal produces sound waves that’s why they are known as……………………. 
a) Conductors   b) Ductile   c) Weak     d) sonorous (✓) 

5. While performing test for the gas evolved, when the teacher brought a burning matchstick near the mouth of the test tube, the gas evolved burnt by producing a pop sound. Name the gas evolved. 
a) Carbon dioxide    b) Oxygen    c) Nitrogen    d) Hydrogen (✓) 

6. Balkaran immersed an iron nail into copper sulphate solution. The blue colour of copper sulphate solution changes to
a) blue to pink    b) blue to green(✓)    c) blue to black    d) none of these 

7. Mohit felt tired after doing a little work only. When he visited his doctor, he was told that he had iron deficiency. Where did Mohit have iron in his body?
a) In bones      b) In blood (✓)            c) In hair              d) none of these

8. Magnesium oxide is obtained by burning magnesium ribbon in air. What is the nature of magnesium oxide? 
a) acidic    b) basic (✓)    c) natural    d) none of these 

9. Raman is beating a piece of material into thin sheet. Which material is Raman beating from the given below 
a) copper (✓)    b) Sulphur    c) chlorine    d) oxygen 

10. Ravinder had seen that blacksmith is hammering iron nail and it turns into sheet. This conversion of nail to sheet depicts which nature of iron. 
a) ductility    b) Malleability (✓)    b) Lustre    d) sonorous 

11. Sarabjit’s mother was holding the metal’s kettle with a piece of cloth because it’s wooden handle was broken . She used cloth to lift the kettle because cloth is: 
a) good conductor of heat    b) poor conductor of heat(✓)    c) friend of heat    d) none of these 

12. Aman had learned that metal are hard but his teacher had cut one of the metal with knife. Name the metal used by the teacher. 
a) Potassium (✓)    b) Copper    c) Aluminum    d) Iron 

13. In the following circuit which material can be used instead of iron nail to complete the circuit.
 8th.sci.eng.july.Aug 6
a) Graphite (✓) b) plastic    c) Wood    d) Rubber

14. Which of the following can be beaten into sheets? 
a) Carbon   b) Phosphorous    c) Iodine    d) Iron (✓) 

15. Balkaran added zinc granules to ferrous sulphate solution . The green colour of ferrous sulphate solution disappeared after some time .What could be the possible cause of this colour disappearance. 
a) zinc is more reactive than iron so it displaces iron from its solution. (✓)
b) iron is more reactive than zinc so the colour disappear. 
c) can’t say anything about the colour change 
d) none of these. 

16. Anhad had dissolved ‘X’ compound into water. He obtained a bright blue coloured solution. Name compound X he had used. 
a) Zinc sulphate   b) Iron sulphate   c) Copper sulphate (✓)    d) none of these

17. Avnoor had used aluminium foil paper to complete the circuit. After inserting the battery , blubs glows. From this what we can say about the nature of aluminium foil. 
a) aluminium is metal (✓)          b) aluminium is non metal 
c) aluminium is bad conductor   d) none of these 

18. Manpreet dipped red litmus paper into rust solution. The colour of red litmus turns blue. What would be the possible cause of this change? 
a) Rust solution is acidic in nature.    b) Rust solution is basic in nature. (✓) 
c) Rust solution is neutral.                d) None of these. 

19. Gagan was taught by his teacher that hydrogen gas is produced when metals react with acid ,but when he placed a metal in dilute hydrochloric acid , no reaction occurred . Which metal did he placed in dilute HCl ?
a) Magnesium     b) Iron     c) Copper (✓)     d) Aluminium 

20. Teacher asked Manpreet about a non metal which has lustre. Name that non metal?
a) Coal b) Chlorine    c) Phosphorus     d) graphite (✓)

21. Simran enquired her mother that why can’t we store or keep lemon pickle in Aluminium vessel?
a) pickle turn sour.                                b) pickle turn sweet 
c) pickle becomes poisonous              d) vessel will get corroded (✓) 

22. Element copper is mainly used to manufacture electrical wires and cooking utensils. Which of the following is NOT a property of copper ? 
a) ductility b) malleability    c) low melting point (✓)     d) good conductor of heat

23. Two elements A and B on burning in air give corresponding oxides . Oxides of both A and B are soluble in water. The aqueous solution of A is alkaline and reacts with aqueous solution of oxide of B to give another compound. Identify A and B.
a) A and B are metals                              b) A and B are non-metals
c) A is metal and B is non-metal (✓)    d) A is non-metal and B is metal

24. Name the least reactive metal out of the following?
a) Silver    b) Gold    c) Copper    d) Platinum(✓) 

25. Harpreet burnt a piece of charcoal (carbon) and collected the gas evolved during the burning process. Name the gas he collected.
a) Oxygen   b) Sulphur dioxide   c) Carbon dioxide (✓)    d) Carbon mono-oxide 

26. Name a metal that is so soft that it can be cut with knife and also it is so reactive that it can not be placed in open air.
a) Phosphorus    b) Iron    c) Potassium (✓)    d) Aluminium 

27. Mehak observed the lustre of new copper utensils is lost after some period of usage . A green coloured layer is formed over them. What is the reason behind this ? 
a) Copper oxide layer is formed over it    b) Copper carbonate layer is formed over it (✓) 
c) Due to corrosion of copper (✓)                d) None of these

28. What is the nature of oxide of non metal ? 
a) Basic    b) Acidic (✓)    c) Neutral     d) None of these 

29. Name the type of reaction in which more reactive metal displaces less reactive metal from its salt solution? 
a) Combination reaction           b) Displacement reaction (✓) 
c) Decomposition reaction     d) Doubled displacement reaction 

30. Which of the following is not a ductile element? 
a) Silver    b) Copper    c) Sulphur (✓)    d) Aluminium 

31. Teacher gave Vicky four different samples of elements and asked him which sample can be beaten into sheet by hammering? 
a) Crystal of iodine   b) Piece of sulphur   c) Piece of iron (✓)   d) Piece of zinc 

32. Name the Non metal element whose isotope is good conductor of electricity? 
a) Gallium    b) Silicon    c) Carbon (✓)    d) Copper 

33. Study the characteristics of substance ‘X’ given below.
1. High melting point 
2. Good conductor of electricity
3. Malleable
Based on the above characteristics, what could ‘X’ be? 
a) Silicon    b) Sodium chloride   c) Iron (✓)    d) Carbon 

34. Which of the following element react vigorously with oxygen? 
a) Carbon    b) Sodium (✓)    c) Silver    d) Gold 

35. Out of the following which is safer to store Sodium and Potassium? 
a) Water     b) Kerosene oil (✓)    c) Glass bottle     d) Plastic bottle 

36. Which of the following non metal can be safely kept in water? 
a) Oxygen    b) Phosphorous (✓)    c) Nitrogen    d) Chlorine 

37. Which gas is produced when Aluminium metal reacts with Sodium Hydroxide solution? 
a) Oxygen    b) Hydrogen (✓)     c) Carbon dioxide     d) nitrogen 

38. What is the nature of Sulphur dioxide gas? 
a) Acidic (✓)    b) Basic    c) Neutral    d) Both 

39. Inside of food cans are coated with tin and not with zinc because 
a) Zinc is costlier than tin                   b) zinc has higher melting point than tin 
c) Zinc is more reactive than tin (✓)    d) zinc is less reactive than tin 

40. Name the non metal whose violet colored solution is used as an antiseptic? 
a) Phosphours    b) Iodine (✓)    c) Sulphur     d) Calcium


More questions-

Question. Differentiate between metal and non-metal on the basis of chemical properties.
Ans. Difference between metals and non-metals on the basis of chemical properties.

Metals and Non metals_1

Question. (i) Write the electron-dot structures for sodium and magnesium.
(ii) What are the ions present in Na2O and MgO.
Ans. (i) Electron-dot structures of sodium and magnesium:

Metals and Non metals_2

      

(ii) Ion present in Na2O is Na+ and O2-
             Ion present in MgO is Mg2+ and O2-

Question. A green layer is gradually formed on a copper plate left exposed to air for a week in a bathroom. What Could this green substance be?
Ans. It is due to the formation of basic copper carbonate (CuCO3.Cu(OH)2.

Question. Which gas is liberated when a metal reacts with an acid? How will you test the presence of this gas?
Ans. Hydrogen gas is formed. Bring a burning matchstick near to it, H2 will burn explosively with ‘pop’ Sound.

Question. (a) In the formation of compound between two atoms A and B, A loses two electrons and B gains one Electron.
(i) What is the nature of bond between A and B?
(ii) Suggest the formula of the compound formed between A and B.
(b)On similar lines explain the formation of MgCl2 molecule.
(c)Common salt conducts electricity only in the molten state. Why?
(d)Why is melting point of NaCl high?
Ans. (a)

Metals and Non metals_3

Metals and Non metals_4

(c)Common salt is an ionic compound which conducts electricity only in molten state because in molten state
The electrostatic forces of attraction between opposite charged ions are overcome due to heat.
Thus ions Move freely and conduct electricity.
(d) NaCl is an ionic compound so there is a strong force of attraction between the positively charged Na Ion and negatively charged chloride ion. Therefore, a considerable amount of energy is required

Question. Explain the following:
(a) Reactivity of Al decreases if it is dipped in HNO3.
(b) Carbon cannot reduce the oxides of Na or Mg.
(c) Iron articles are galvanized.
Ans. (a) When Al metal reacts with HNO3, Al2O3 is formed which further gets deposited on aluminum metal. Hence, more Al metal is not available for the reaction because Al2O3 layer is passive in nature.
(b) Na and Mg both metals are very reactive. These metals have more affinity towards oxygen than carbon. Hence, carbon cannot reduce the oxides of these metals.
(c) Galvanization is a process to protect iron from rusting. Iron get rusted when come in contact with air and moisture.


Please refer to attached file for CBSE Class 8 Science Worksheet - Materials-Metals and Non-Metals Part A

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