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Question

Which of the following reactions are not feasible?


A

Mg+2HClMgH2+Cl2

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B

2Mg+O22MgO

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C

Fe+2HClFeCl2+H2

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D

Au+2HClAuCl2+H2

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Solution

The correct options are
A

Mg+2HClMgH2+Cl2


D

Au+2HClAuCl2+H2


Metals on reaction with Acids release hydrogen gas.

So, the correct reaction is Mg+2HClMgCl2+H2

Gold (Au) does not react with HCl. Hence the reaction

Au+2HClAuCl2+H2 is not feasible.


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