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(D) The test for zinc ions $(Zn^{2+})$ involves heating the substance with cobalt nitrate $(Co(NO_3)_2)$ on a charcoal cavity. When zinc compounds are

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All of these

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(D) The test for zinc ions $(Zn^{2+})$ involves heating the substance with cobalt nitrate $(Co(NO_3)_2)$ on a charcoal cavity. When zinc compounds are heated with $Co(NO_3)_2$,they form cobalt zincate $(CoZnO_2)$,which is known as Rinmann's green. $ZnO + Co(NO_3)_2 \rightarrow CoZnO_2 + 2NO_2 + \frac{1}{2}O_2$. Since $ZnO$,$3Zn(OH)_2 \cdot ZnCO_3$ (basic zinc carbonate),and $ZnSO_4$ all contain zinc,they can all produce $ZnO$ upon heating,which subsequently reacts to form Rinmann's green. Therefore,all of these compounds can produce the green color.

Which of the following compounds can produce Rinmann's green with $Co(NO_3)_2$ solution?

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