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  • Cobalt nitrate on heating in charcoal cavity with gives a blue compound. What is the compound?<

Cobalt nitrate on heating in charcoal cavity with \mathrm{Al_2O_3} gives a blue compound. What is the compound?

Option: 1

\mathrm{CoO}


Option: 2

\mathrm{CoO.Al_2O_3}


Option: 3

\mathrm{CoO_2}


Option: 4

\mathrm{CoAlO_2}


Answers (1)

best_answer

On heating, cobalt nitrate decomposes into cobalt (II) oxide, which gives a characteristic colour with metal oxide present in the cavity.

\mathrm{CoO + Al_2O_3 \rightarrow CoO. Al_2O_3 (blue)}

Hence Option 2 is correct.

 

 

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manish

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