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Chemistry-

General

Easy

Question

Which one of the following metals will give blue ash when its salt is heated with $N a subscript 2 end subscript C O subscript 3 end subscript$ solid and $C o open parentheses N O subscript 3 end subscript close parentheses subscript 2 end subscript$ on a charcoal piece

$C u$
$M g$
$A l$
$Z n$

The correct answer is: $A l$

$C o A l O subscript 2 end subscript$ is formed which is blue. Follow cobalt nitrate-charcoal test.

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