Advertisements
Advertisements
Question
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?
Advertisements
Solution
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.
APPEARS IN
RELATED QUESTIONS
Very Short Answer Type Question:
Select a lustrous material out of the following substances.
Short Answer Type Question:
Why is water important for our body?
Match the objects that are made of the same material.
| A | B | C |
 |
 |
 |
 |
 |
 |
 |
 |
 |
Select those objects from the following which shine:
Glass bowl, plastic toy, steel spoon, cotton shirt
A piece of wood floats on water.
Pick one material from the following which is completely soluble in water.
Which of the following materials is not lustrous?
Which of the following statements is not true?
Match the objects given in Column I with the materials given in Column II.
| COLUMN I | COLUMN II | ||
| (a) | Surgical instruments | (i) | Plastic |
| (b) | Newspaper | (ii) | Animal product |
| (c) | Electrical switches | (iii) | Steel |
| (d) | Wool | (iv) | Plant product |
Differentiate among opaque, translucent and transparent materials, giving one example of each.
