{"id":3647,"date":"2023-01-02T05:18:37","date_gmt":"2023-01-02T05:18:37","guid":{"rendered":"https:\/\/theexampillar.com\/ncert\/?p=3647"},"modified":"2023-01-31T07:01:43","modified_gmt":"2023-01-31T07:01:43","slug":"ncert-solutions-class-8-science-chapter-4-materials-metals-and-non-metals","status":"publish","type":"post","link":"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-8-science-chapter-4-materials-metals-and-non-metals\/","title":{"rendered":"NCERT Solutions Class 8 Science Chapter 4 Materials: Metals and Non-Metals"},"content":{"rendered":"

NCERT Solutions Class 8 Science\u00a0<\/span><\/h2>\n

The NCERT Solutions in English Language for Class 8 Science Chapter – 4 (Materials : Metals and Non-Metals) <\/strong>has been provided here to help the students in solving the questions from this exercise.<\/span><\/p>\n

Chapter – 4 (Materials : Metals and Non-Metals)<\/span><\/h2>\n

1. Which of the following can be beaten into thin sheets?
\n<\/strong>(a)<\/strong> Zinc
\n(b)<\/strong> Phosphorus
\n(c)<\/strong> Sulphur
\n(d)<\/strong> Oxygen<\/span><\/p>\n

Answer – (<\/strong>a)<\/strong> Zinc<\/span><\/p>\n

2. Which of the following statements is correct?
\n<\/strong>(a)<\/strong> All metals are ductile.
\n(b)<\/strong> All non-metals are ductile.
\n(c)<\/strong> Generally, metals are ductile.
\n(d)<\/strong> Some non-metals are ductile.<\/span><\/p>\n

Answer –\u00a0 <\/strong>(c)<\/strong> Generally, metals are ductile.<\/span><\/p>\n

3. Fill in the blanks.
\n<\/strong>(a)<\/strong> Phosphorus is a very _________non-metal.
\n(b)<\/strong> Metals are\u00a0_________ conductors of heat and ____________ .
\n(c)<\/strong> Iron is ____________reactive than copper.
\n(d)<\/strong> Metals react with acids to produce ____________ gas.<\/span><\/p>\n

Answer – <\/strong><\/span><\/p>\n

(a)<\/strong> Phosphorus is a very\u00a0reactive<\/strong><\/span>\u00a0non-metal.
\n(b)<\/strong> Metals are\u00a0good<\/strong><\/span>\u00a0conductors of heat and\u00a0electricity<\/span>.
\n<\/strong>(c)<\/strong> Iron is\u00a0more<\/strong><\/span>\u00a0reactive than copper.
\n(d)<\/strong> Metals react with acids to produce\u00a0hydrogen<\/strong><\/span>\u00a0gas.<\/span><\/p>\n

4. Mark \u2018T\u2019 if the statement is true and \u2018F\u2019 if it is false.
\n<\/strong>(a)<\/strong> Generally, non-metals react with acids. ( )
\n(b)<\/strong> Sodium is a very reactive metal. ( )
\n(c)<\/strong> Copper displaces zinc from zinc sulphate solution. ( )
\n(d)<\/strong> Coal can be drawn into wires. ( )<\/span><\/p>\n

Answer – <\/strong><\/span><\/p>\n

(a)<\/strong> Generally, non-metals react with acids. (False)<\/strong>
\n(b)<\/strong> Sodium is a very reactive metal. (True)<\/strong>
\n(c)<\/strong> Copper displaces zinc from zinc sulphate solution. (False)<\/strong>
\n(d)<\/strong> Coal can be drawn into wires. (False)<\/strong><\/span><\/p>\n

5. Some properties are listed in the following table. Distinguish between metals and non-metals on the basis of these properties.<\/strong><\/span><\/p>\n\n\n\n\n\n\n\n\n\n
Properties<\/strong><\/span><\/td>\nMetals<\/strong><\/span><\/td>\nNon-metals<\/strong><\/span><\/td>\n<\/tr>\n
1. Appearance<\/span><\/td>\n<\/td>\n<\/td>\n<\/tr>\n
2. Hardness<\/span><\/td>\n<\/td>\n<\/td>\n<\/tr>\n
3. Malleability<\/span><\/td>\n<\/td>\n<\/td>\n<\/tr>\n
4. Ductility<\/span><\/td>\n<\/td>\n<\/td>\n<\/tr>\n
5. Heat Conduction<\/span><\/td>\n<\/td>\n<\/td>\n<\/tr>\n
6. Conduction of Electricity<\/span><\/td>\n<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Answer – <\/strong><\/span><\/p>\n\n\n\n\n\n\n\n\n\n
Properties<\/strong><\/span><\/td>\nMetals<\/strong><\/span><\/td>\nNon-metals<\/strong><\/span><\/td>\n<\/tr>\n
1. Appearance<\/span><\/td>\nLustrous<\/span><\/td>\nDull<\/span><\/td>\n<\/tr>\n
2. Hardness<\/span><\/td>\nHard<\/span><\/td>\nSoft<\/span><\/td>\n<\/tr>\n
3. Malleability<\/span><\/td>\nHave property of Malleability<\/span><\/td>\nDo not have a property of Malleability<\/span><\/td>\n<\/tr>\n
4. Ductility<\/span><\/td>\nHave property of Ductility<\/span><\/td>\nDo not have the property of Ductility<\/span><\/td>\n<\/tr>\n
5. Heat Conduction<\/span><\/td>\nGood conductor of Heat<\/span><\/td>\nBad Conductor of Heat<\/span><\/td>\n<\/tr>\n
6. Conduction of Electricity<\/span><\/td>\nGood conductor of Electricity<\/span><\/td>\nThe bad conductor of Electricity<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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

Answer – <\/strong><\/span><\/p>\n

(a)<\/strong> Aluminium foils are used to wrap food items because aluminium metal is malleable. Therefore, it can be beaten into thin foils.\u00a0<\/span><\/p>\n

(b)<\/strong> Metals are good conductors of heat and electricity. Therefore, immersion rods for heating liquids are made of metallic substances.<\/span><\/p>\n

(c)<\/strong> Copper cannot displace zinc from its salt solution because zinc is more reactive than copper.<\/span><\/p>\n

(d)<\/strong> Sodium and potassium are stored in kerosene because they are highly reactive elements. They can easily catch fire even when in contact with air.<\/span><\/p>\n

7. Can you store lemon pickle in an aluminium utensil? Explain.<\/strong><\/span><\/p>\n

Answer –\u00a0 <\/strong>Lemon pickle cannot be stored in aluminium utensils because lemon pickle contains acids, which can react with aluminium (metal) liberating hydrogen gas. This can lead to the spoiling of the pickle.<\/span><\/p>\n

8. Match the substances given in Column A with their uses given in Column B.<\/b><\/span><\/p>\n\n\n\n\n\n\n\n\n\n
A<\/strong><\/span><\/td>\nB<\/strong><\/span><\/td>\n<\/tr>\n
(i) Gold<\/span><\/td>\n(a) Thermometers<\/span><\/td>\n<\/tr>\n
(ii) Iron<\/span><\/td>\n(b) Electric wire<\/span><\/td>\n<\/tr>\n
(iii) Aluminium<\/span><\/td>\n(c) Wrapping food<\/span><\/td>\n<\/tr>\n
(iv) Carbon<\/span><\/td>\n(d) Jewellery<\/span><\/td>\n<\/tr>\n
(v) Copper<\/span><\/td>\n(e) Machinery<\/span><\/td>\n<\/tr>\n
(vi) Mercury<\/span><\/td>\n(f) Fuel<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Answer – <\/strong><\/span><\/p>\n\n\n\n\n\n\n\n\n\n
A<\/strong><\/span><\/td>\nB<\/strong><\/span><\/td>\n<\/tr>\n
(i) Gold<\/span><\/td>\n(d) Jewellery<\/span><\/td>\n<\/tr>\n
(ii) Iron<\/span><\/td>\n(e) Machinery<\/span><\/td>\n<\/tr>\n
(iii) Aluminium<\/span><\/td>\n(c) Wrapping food<\/span><\/td>\n<\/tr>\n
(iv) Carbon<\/span><\/td>\n(f) Fuel<\/span><\/td>\n<\/tr>\n
(v) Copper<\/span><\/td>\n(b) Electric wire<\/span><\/td>\n<\/tr>\n
(vi) Mercury<\/span><\/td>\n(a) Thermometers<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

9. What happens when
\n<\/strong>(a)<\/strong> Dilute sulphuric acid is poured on a copper plate?
\n(b)<\/strong> Iron nails are placed in a copper sulphate solution?
\nWrite word equations of the reactions involved.<\/strong><\/span><\/p>\n

Answer –
\n<\/strong>(a)<\/strong> Copper sulphate is formed and hydrogen gas is released.<\/span>
\nCopper + Dilute Sulphuric Acid \u2192 Copper sulphate + Hydrogen (gas)<\/span>
\nCu + H2<\/sub>SO4<\/sub> (conc.) \u2192 CuSO4<\/sub>\u00a0+ H2<\/sub><\/span><\/p>\n

(b) <\/strong>Brown coating is deposited on the iron nails. This is because of the displacement of copper from copper sulphate solution by iron.<\/span>
\nIron + Copper sulphate (solution) \u2192 Iron sulphate (solution) + Copper<\/span>
\nFe + CuSO4 <\/sub>\u2192 FeSO4<\/sub>\u00a0+ Cu<\/span><\/p>\n

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

Answer –
\n<\/strong>(a)<\/strong> Saloni needs to add some water in the test tube in which the gas is collected. She needs to cover the tube and shake it well. Now she will test the solution with both red and blue litmus. Blue litmus turns to red which shows that the gas is acidic in nature.<\/span><\/p>\n

(b)<\/strong> Charcoal reacts with oxygen to form carbon dioxide gas.
\nC <\/span>+ <\/span><\/span>O<\/span>2 <\/span><\/span><\/span><\/sub>\u200b<\/span><\/span><\/span><\/span><\/span>\u27f6 <\/span><\/span>C<\/span>O<\/span>2<\/span><\/span><\/span><\/sub>\u200b
\nCarbon dioxide gas reacts with water to form carbonic acid which is acidic in nature and turns blue litmus red.
\nC<\/span>O<\/span>2 <\/span><\/span><\/span><\/sub>\u200b + <\/span>H<\/span>2<\/span><\/span><\/span><\/sub>\u200bO <\/span>\u27f6 <\/span>H<\/span>2<\/span><\/span><\/span><\/sub>\u200bC<\/span>O<\/span>3<\/span><\/span><\/span><\/sub>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>
\n<\/span><\/p>\n

11. One day Reeta went to a jeweller\u2019s 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?<\/strong><\/span><\/p>\n

Answer –\u00a0 <\/strong>Gold is metal it is washed in acidic solution. Some gold dissolve in acid to form oxide. This causes the loss of gold in the form of gold oxide. In this process certain amount of gold is lost to the acidic solution.<\/span><\/p>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n
NCERT Class 8th\u00a0<\/sup>Solution\u00a0<\/strong><\/span><\/td>\n<\/tr>\n
NCERT Solutions Class 8 English<\/a><\/span><\/strong><\/span><\/td>\n<\/tr>\n
NCERT Solutions Class 8 Hindi<\/a><\/span><\/strong><\/span><\/td>\n<\/tr>\n
NCERT Solutions Class 8 Mathematics<\/a>\u00a0<\/span><\/strong><\/span><\/td>\n<\/tr>\n
NCERT Solutions Class 8 Sanskrit<\/span><\/strong><\/span><\/a><\/td>\n<\/tr>\n
NCERT Solutions Class 8 Science<\/a><\/span><\/strong><\/span><\/td>\n<\/tr>\n
NCERT Solutions Class 8 Social Science<\/a><\/span><\/strong><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

NCERT Solutions Class 8 Science\u00a0 The NCERT Solutions in English Language for Class 8 Science Chapter – 4 (Materials : Metals and Non-Metals) has been provided here to help the students in solving the questions from this exercise. Chapter – 4 (Materials : Metals and Non-Metals) 1. Which of the following can be beaten into […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[535],"tags":[543,544,538,5],"class_list":["post-3647","post","type-post","status-publish","format-standard","hentry","category-class-8-science","tag-ncert-class-8-science-chapter-4-materials-metals-and-non-metals-in-english","tag-ncert-solutions-class-8-science-chapter-4-in-english","tag-ncert-solutions-class-8-science-in-english","tag-ncert-solutions-in-english"],"yoast_head":"\nNCERT Solutions Class 8 Science Chapter 4 Materials: Metals and Non-Metals | TheExamPillar NCERT<\/title>\n<meta name=\"description\" content=\"NCERT Solutions Class 8 Science\u00a0The NCERT Solutions in English Language for Class 8 Science Chapter - 4 (Materials : Metals and Non-Metals) has been provided here to help the students in solving the questions from this exercise.Chapter - 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