Which one of the following metals will give b | vedclass

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(C) The charcoal cavity test with $Co(NO_3)_2$ is used for the identification of certain metals. When aluminum salts are heated with $Na_2CO_3$ and $C

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$Al$

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(C) The charcoal cavity test with $Co(NO_3)_2$ is used for the identification of certain metals. When aluminum salts are heated with $Na_2CO_3$ and $Co(NO_3)_2$ on a charcoal piece,they form cobalt aluminate $(CoAl_2O_4)$,which is known as Thenard's blue. The reaction is: $2Co(NO_3)_2 \rightarrow 2CoO + 4NO_2 + O_2$ and $CoO + Al_2O_3 \rightarrow CoAl_2O_4$ (blue ash).

Which one of the following metals will give blue ash when its salt is heated with $Na_2CO_3$ solid and $Co(NO_3)_2$ on a charcoal piece?

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