Question 6
Why metals often lose their shine and appear du
Question 7
Which of the following materials is not lustrous?
(a) Gold
(b) Silver
Vehwood
(d) Diamond
stion 8
vive in w
Answers
Explanation:
1 Some metals often lose their shine and appear dull, because of the action of air and moisture on them. Some metals as a result of oxidation with the atmospheric oxygen form oxides and by which their appearance becomes dull
2 wood
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Answer for Question 6
It is the effect of air and moisture. Metals like iron, alluminium etc. reacts with moist air and get oxidised and they lose their shine. Parts of air like hydrogen sulphide, sulphur, carbonates reacts with metals like silver (reacts with hydrogen sulphide to form silver sulphide) and copper (reacts with sulphur to form copper sulphate) which causes dullness.
Answer for Question 7
Lustrous means shiny appearance. Wood is not lustrous. It has a dull appearance. On the other hand, gold, diamond, and silver are lustrous and shiny.