why does nitric acid does not react with gold and platinum?

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Solution

Gold and platinum are inert metals. They comes below the hydrogen gas in electrochemical series, so these are very less reactive metals and can not replace hydrogen. So gold and platinum can not react with nitric acid.

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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 does not react easily with acid but it reacts with aqua regia. What is aqua regia ? Why does it react with gold?

Q. Nitric acid does not react with :

Q. A noble metal is one which is inert and does not react with acids like

H C l, H N O_{3}, H_{2} S O_{4}

. Select an option with a set of two noble metals.

A noble metal is one which is inert and does not react with acids like $H C l, H N O_{3}, H_{2} S O_{4}$ . Select an option with a set of two noble metals.

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