10) Copper is mixed with gold to make ornaments because alloying
10) Copper is mixed with gold to make ornaments because alloying
The correct option is A increases the hardness of gold
Explanation of the correct option:
When one metal is mixed with other metal or non-metal which leads to increase its physical properties is known as alloying.
(A) Gold is soft, hence it does not retain its shape in jewelry making, hence gold is mixed with copper (20 carat or 22 carat) so that it may become hard and may become suitable for making ornaments.
Explanation of incorrect options:
(B) Malleability refers drawing of metals into thin sheets. Gold is already very soft and malleable.
(C) In making ornaments, we do not need to enhance heating capability of metal.
(D) Fusibility refers to capacity of melting. We do not require capacity of melting in making ornaments.
Hence, the correct option is (A).
increases the hardness of gold
Explanation of the correct option:
When one metal is mixed with other metal or non-metal which leads to increase its physical properties is known as alloying.
(A) Gold is soft, hence it does not retain its shape in jewelry making, hence gold is mixed with copper (20 carat or 22 carat) so that it may become hard and may become suitable for making ornaments.
Explanation of incorrect options:
(B) Malleability refers drawing of metals into thin sheets. Gold is already very soft and malleable.
(C) In making ornaments, we do not need to enhance heating capability of metal.
(D) Fusibility refers to capacity of melting. We do not require capacity of melting in making ornaments.
Hence, the correct option is (A).
