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Reaction of Acids and Bases with Metals

Give reason :...

Question

Give reason :
Crude gold can be purified by the addition of conc nitric acid to it but crude copper can not be purified by the addition of conc nitric acid to it.

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Solution

Since Pure gold does not react with acid that is Conc Nitric acid thus crude gold can be purified by treating it with conc nitric acid.
While copper reacts with nitric acid to form copper nitrate ,thus crude copper can not be purified by nitric acid.

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Q. In the laboratory preparation of nitric acid from -

K N O_{3}

N a N O_{3}

, on the addition of conc. sulphuric acid and copper in the prepared nitric acid give _____________ .

Q. Assertion :Rectified spirit can be further purified by adding a dehydrating agent.
Reason: Addition of

H_{2} S O_{4}

to 96% ethyl alcohol gives 100% ethyl alcohol.

Q. The yellowish tinge of nitric acid cannot be removed by the dropwise addition of water to it.

Q. Give reasons for the following:
(i) In laboratory preparation of nitric acid all the apparatus including cork should be made up of glass.
(ii) Commercial nitric acid is yellow in colour, but when it is diluted with water, it turns colourless.
(iii) Aluminium does not react with nitric acid of any concentration.
(iv) Conc. nitric acid renders iron passive.
(v) Nitric acid is used in purification of gold.
(vi) Aqua regia dissolves gold and platinum.
(vii) Nitric acid usually does not yield hydrogen from acids.
(viii) Lightning is a blessing in disguise.
(ix) Concentrated nitric acid is brown in colour.
(x) Concentrated nitric acid is a stronger oxidizing agent.

___% nitric acid is obtained by distilling 68% nitric acid with Conc. $H_{2} S O_{4}$ .

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