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Uses of Nitric Acid

Gold cannot b...

Question

Gold cannot be extracted from an alloy using nitric acid.

A

True

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B

False

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Solution

The correct option is B
False

Nitric acid will not dissolve gold, but it will dissolve most of the other metals.

It can be used to dissolve the non-gold portion of the alloy, leaving the gold behind.

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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.

Gold cannot be extracted from an alloy using nitric acid.

Q. Concentrated nitric acid dissolves gold.
If true then enter 1, if false then enter 0.

Q. Boiling cannot be used to concentrate Nitric Acid beyond a certain concentration. True or false ?

Q. 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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Uses of Nitric Acid

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