A white solid leaves a residue upon dry heating that is yellow when hot and white when cold. Upon heating this white residue with a drop of cobalt nitrate in a charcoal cavity, a distinct green mass i

Question

A white solid leaves a residue upon dry heating that is yellow when hot and white when cold. Upon heating this white residue with a drop of cobalt nitrate in a charcoal cavity, a distinct green mass is formed. The white solid originally tested is likely:

Prashant Kotian · Accepted Answer

Correct answer: C. Zinc salts decompose to leave a white residue of , which is famously yellow when hot and white when cold. When is heated with cobalt nitrate, it forms a double oxide , known as Rinmann's green. Thus, the original solid contains .

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