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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
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.
Q2
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.
Q3
Differentiate between metal and non-metal on the basis of their chemical properties.
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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
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Chapter 9: Heredity and Evolution
12 questions
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Chapter 10: Light -Reflection and Refraction
34 questions
11
Chapter 11: The Human Eye and Colourful World
18 questions
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Chapter 12: Electricity
49 questions
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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: 3 mins
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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In tarnished copper vessel there is a layer formed due to corrosion as copper reacts with and forms copper carbonate because of that copper loses its shiny brown surface forg a green layer over it which is basic in nature which is dissolved in the citric acid present in lemon or tamarind juice. Thus the vessel gets thoroughly cleaned.
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Practice more questions from Science (NCERT)
Q1
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.
Q2
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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Differentiate between metal and non-metal on the basis of their chemical properties.
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| Question Text | 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. |
| Updated On | Dec 25, 2023 |
| Topic | Metals and Non-metals |
| Subject | Science |
| Class | Class 10 |
| Answer Type | Text solution:1 Video solution: 6 |
| Upvotes | 552 |
| Avg. Video Duration | 3 min |
