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Chapter 1: Chemical Reactions and Equations
34 questions
2
Chapter 2: Acid,Bases and Salts
39 questions
3
Chapter 3: Metals and Non-metals
38 questions
Q1
What type of oxides are formed when non-metals combine with oxygen?
Q2
Give reasons.
(a) Platinum, gold and silver are used to make jewellery.
(b) Sodium, potassium and lithium are stored under oil.
(c) Aluium is a highly reactive metal, yet it is used to make utensils for cooking.
(d) Carbonate and sulphide ores are usually converted into oxides during the process of extraction.
(a) Platinum, gold and silver are used to make jewellery.
(b) Sodium, potassium and lithium are stored under oil.
(c) Aluium is a highly reactive metal, yet it is used to make utensils for cooking.
(d) Carbonate and sulphide ores are usually converted into oxides during the process of extraction.
Q3
You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels.
View all question4
Chapter 4: Carbon and its Compound
24 questions
5
Chapter 5: Periodic Classification of Elements
30 questions
6
Chapter 6: Life Processes
13 questions
7
Chapter 7: Control and Coordination
12 questions
8
Chapter 8: How do Organism Reproduce?
11 questions
9
Chapter 9: Heredity and Evolution
12 questions
10
Chapter 10: Light -Reflection and Refraction
34 questions
11
Chapter 11: The Human Eye and Colourful World
18 questions
12
Chapter 12: Electricity
49 questions
13
Chapter 13: Magnetic Effects of Electric Current
39 questions
14
Chapter 14: Sources of Energy
24 questions
15
Chapter 15: Our Environment
9 questions
16
Chapter 16: Sustainable Management of Natural Resources
7 questions
Question
Medium
Solving time: 5 mins
Give reasons.
(a) Platinum, gold and silver are used to make jewellery.
(b) Sodium, potassium and lithium are stored under oil.
(c) Aluium is a highly reactive metal, yet it is used to make utensils for cooking.
(d) Carbonate and sulphide ores are usually converted into oxides during the process of extraction.
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Text solution
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(a) Platinum, gold and silver are used to make jewellery because these are low reactive metals. So they rarely corrode and hence do not lose their shine and lustre.
(b) The reaction of these substances with oxygen is highly exothermic which may cause fire, also they react with water to form base so they are kept in oil.
(c) This is because aluium is good conductor of heat and electricity. To prevent its reaction with food at high temperature a protective layer of aluium oxide ( ) is formed which prevent further corrosion.
(d) Carbonate and sulphide ores are usually converted into oxides during the process of extraction because it is easier to obtain metal from its oxide as compared with its sulphides or carbonates ore.
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Practice more questions from Science (NCERT)
Q1
What type of oxides are formed when non-metals combine with oxygen?
Q2
Give reasons.
(a) Platinum, gold and silver are used to make jewellery.
(b) Sodium, potassium and lithium are stored under oil.
(c) Aluium is a highly reactive metal, yet it is used to make utensils for cooking.
(d) Carbonate and sulphide ores are usually converted into oxides during the process of extraction.
(a) Platinum, gold and silver are used to make jewellery.
(b) Sodium, potassium and lithium are stored under oil.
(c) Aluium is a highly reactive metal, yet it is used to make utensils for cooking.
(d) Carbonate and sulphide ores are usually converted into oxides during the process of extraction.
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You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels.
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| Question Text | Give reasons. (a) Platinum, gold and silver are used to make jewellery. (b) Sodium, potassium and lithium are stored under oil. (c) Aluium is a highly reactive metal, yet it is used to make utensils for cooking. (d) Carbonate and sulphide ores are usually converted into oxides during the process of extraction. |
| Updated On | Feb 4, 2022 |
| Topic | Metals and Non-metals |
| Subject | Science |
| Class | Class 10 |
| Answer Type | Text solution:1 Video solution: 1 |
| Upvotes | 164 |
| Avg. Video Duration | 7 min |
