Does Gold Dissolve In Nitric Acid?

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Solution

No, lower karat gold alloys will dissolve more quickly than higher karat alloys because they contain more copper or silver, which dissolve in nitric acid, while gold does not.

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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.

Explain the reason why:
(i) HCl gas fumes in moist air.
(ii) Dilute HCl cannot be concentrated beyond 22.2% by distillation.
(iii) Dilute acids are stronger electrolytes as compared to concentrated acid.
(iv) Liquid ammonia has no action on litmus while liquor ammonia has an effect.
(v) Ammonia is not collected over water.
(vi) Pure nitric acid does not dissolve gold or platinum, but aqua regia dissolves them.

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

Cu does not dissolve in HCl but dissolves in nitric acid. Explain why?

Why Cu does not dissolve in Hcl but in Nitric acid it is oxidised ?

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