give reason for the following
(a) Silicon counts among metalloids.
(b) Carbon is not used is making of aluminium from aluminium oxide.
(c) Metals conduct electricity.
(e) Na, K and Ca metals form hydrides by combination with hydrogen gas, but most of
Give reasons for the following:
bolo
(d) For making gold ornaments, 22-carat gold is preferred to 24-carat gold.
the other metal do not.
OVIES
Answers
Answer:
a) Silicon is in - between metals and non metals. Silicon has 4 electrons in its outer orbitals which it can donate like a metal or it can also accept 4 electrons like a non metal. So, it shows both the properties of metals and non metals. Hence, it is called a metalloid or semi conductor.
b) carbon is used for carbon reduction method in case of condensation of ore , but here aluminium is not preferably good position in the electro chemical series . because of this condensing of aluminium from aluminium oxide is not done by using carbon.
c) Metals conduct electricity because they readily give up their valence electrons.In metals electrons are free to move throughout the structure, and gives rise to properties such as conductivity.
e) Na , K and Ca metals form hydrides by combination with hydrogen gas because these are highly reactive metals and these are react with hydrogen gas , (H2) to form hydrides. But most other metals do not highly reactive so they do not form hydrides.
d) To impart strength, some impurities are mixed such as copper to make the 22 carat gold which is suitable for making ornaments
Answer:
something that will serve you your whole life. The most powerful thing in the world is knowledge because bless
Explanation:
something that will serve you your whole life. The most powerful thing in the world is knowledge because now