SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Why is ammonia used to test for copper in a solution? Choose the best answer.
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Different people see colors differently.
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The ammonia test can detect smaller amounts of copper than the human eye can detect.
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The odor of ammonia is easily detected by most people.
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All chemical tests are superior to relying on information provided by the senses.
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Explanation:
Detailed explanation-1: -When ammonia reacts with Copper oxide ( C u O ), it produces solid copper and liberates nitrogen gas. In this reaction, the color of black Copper oxide is converted to reddish-brown C u solid. This reaction illustrates the reducing nature of ammonia.
Detailed explanation-2: -Due to the presence of lone pair ammonia has the ability to form complex compounds. Here, in the above given reaction $[Cu(NH 3) 4]^2 + $ is the deep blue coloured complex. This deep blue colouration in this reaction indicates the presence of $Cu^2 + $ ions.
There is 1 question to complete.