Question

i)Why is gold used for making jewellery?
Ans:-
ii)What do you mean by corrosion?
Ans:-
Ili)No gas is released when sulphur is added to dilute HCI?
Ans:-
iv)Why are electrical cables made from copper?
Ans:-

CBSE CLASS 8
SCIENCE CHAP
METALS
AND
NON METALS​

Answer 1

Answer:

Corrosion is a natural prosses that convert a refined metal into a chemmicaly stable...

Answer 2

1=Gold does not tarnish, rust or corrode. Due to its wonderful qualities and its luster, gold is considered the most important metal in jewellery making. As pure gold is too soft for everyday wear, it is alloyed with a mixture of metals in order to make the gold harder, so it can be used for jewellery.

2=Corrosion is when a refined metal is naturally converted to a more stable form such as its oxide, hydroxide or sulphide state this leads to deterioration of the material.

3=Chlorine is much more reactive than suplhur. hence sulphur cannot replace chlorine from HCL and produce hydrogen gas. ANSWER: No gas is released when sulphur is added withdilute HCl because chlorine is more reactive than sulphur.

4=Copper is commonly used for building wire because of its conductivity, strength, and reliability. Over the life of a building wire system, copper can also be the most economical conductor. Copper used in building wire has a conductivity rating of 100% IACS or better.

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