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प्रश्न
lt was Paheli’s birthday. Her grandmother gave her two gifts made of metals, one old dull silver spoon and a pair of lustrous gold earrings. She was surprised to see the difference in the appearance of the two metals. Can you explain the reason for this difference?
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उत्तर
Gold is a noble metal it does not react with the gases present in the atmosphere. Silver reacts with some gases like hydrogen sulphide and loses its shine in moist air.
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संबंधित प्रश्न
Very Short Answer Type Question:
List three liquids which are transparent.
Look at the pictures and identify the materials by which they are made of:
(paper, clay, glass, wood, plastic, metal rubber, wax
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| ____________ | ____________ | ____________ | ___________ | _____________ |
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| ____________ | ____________ | ____________ | ____________ | ____________ |
Write whether the given materials are hard or soft.
| Wood | Eraser | Cotton |
| ______ | ______ | ______ |
Sort the given objects as rough or smooth.
| Wet soap | Coir | Feather | Stone |
| ______ | ______ | ______ | ______ |
| Glass ball | Paperboard | Sand paper | Plastic spoon |
| ______ | ______ | ______ | ______ |
When can you say a material is waterproof material?
Select those objects from the following which shine:
Glass bowl, plastic toy, steel spoon, cotton shirt
Stone is transparent, while glass is opaque.
Which among the following is an example of dull material?
Differentiate hard and soft materials.
Which of the following materials is not lustrous?
