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Standard X

Chemistry

Reaction of Metallic Oxides and Hydroxides with Acids

A coin is ana...

Question

A coin is analysed by dissolving it in nitric acid. To the resulting solution an excess of aqueous Ammonia is added and the mixture is filtered. A brown precipitate remains in the filter paper and a deep blue solution is obtained as the filtrate. Which metals does the coin contain?

Aluminium and Copper

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Copper and Iron

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Iron and Lead

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Lead and Zinc

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Solution

The correct option is B
Copper and Iron

The brown precipitate indicates the presence of the ferric ion and the deep blue solution confirms the presence of the copper ion.

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Similar questions

Q. A coloured solution known to contain two metal ions was treated with excess cold sodium hydroxide solution. When filtered a whitish solid, slowly changing to brown, was retained on the filter paper and a colourless solution collected as the filtrate. The dropwise addition of hydrochloric acid to the filtrate produced a white ppt. which dissolved in excess acid. Treatment of the residue on filter paper with a solution of a strong oxidiser produced a reddish-violet solution.

Indicate any pairs of ions:

Q. An aqueous solution of a gas (X) shows the following reactions :
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(iii) On addition to a ferric chloride solution, a brown precipitate, soluble in dilute nitric acid, is obtained.

Identify (X).

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Q. A

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A coin is analysed by dissolving it in nitric acid. To the resulting solution an excess of aqueous Ammonia is added and the mixture is filtered. A brown precipitate remains in the filter paper and a deep blue solution is obtained as the filtrate. Which metals does the coin contain?

The correct option is B Copper and IronThe brown precipitate indicates the presence of the ferric ion and the deep blue solution confirms the presence of the copper ion.

The correct option is B
Copper and Iron

The brown precipitate indicates the presence of the ferric ion and the deep blue solution confirms the presence of the copper ion.