Chemistry, asked by lakshmisatyakameswar, 7 months ago

Give Reasons for the following
1. Metals conduct Electricity
2. Reaction of nitric Acid with metals generally does not evolve hydrogen gas.
3. For making gold Ornaments,22 carat Gold is preferred to 24 carat Gold

Answers

Answered by SHRISTIMOHAN
3

i) Metals conduct electricity because they have free  electrons to move. The free electrons in metals are responsible for the high electrical conductivity .The free electrons  offer little resistance to the flow of current. Silver and copper are the best conductor of electricity.

ii) Reaction of metals with nitric acid does not evolve hydrogen gas. It is because HNO3 is a strong oxidizing agent. It oxidises H2 to produce water and itself gets reduced to any of its oxides such as N2O(dinitrogen monoxide),NO(nitrogen monoxide) or NO2(nitrogen dioxide).

iii) Pure gold is 24 carat and is very soft. Therefore it is not suitable for making jewellery. It is alloyed with Cu or Ag to make it hard. Generally 22 carat gold is used for making ornaments which contains 22 parts of pure gold and 2 parts of either Cu or Ag.

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