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CHEMISTRY

JAMB 2011 - Question 33

Chemistry 2011 JAMB Past Questions - Question 33: A few drops of concentrated HNO3is added to an unknown solution and boiled for a while. If this produces a brown solution, the cation present is likely to be

Choose the correct answers from the options given.

A few drops of concentrated HNO3is added to an unknown solution and boiled for a while. If this produces a brown solution, the cation present is likely to be

A: Pb²+

B: Cu²+

C: Fe³+

D: Fe²+

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Correct Answer

Explanation

The formation of a brown solution upon the addition of concentrated nitric acid (HNO?) and subsequent boiling typically indicates the presence of Fe³+ ions. This reaction forms iron(III) nitrate, which can produce a brown coloration.

So, the likely cation present in the unknown solution is Fe³+ (Iron(III)).