A white solid leaves a residue upon dry heating that is yellow when hot and white when cold. This ob — Qualitative and Quantitative Analysis Chemistry Question
Question
A white solid leaves a residue upon dry heating that is yellow when hot and white when cold. This observation strongly indicates the presence of:
Answer: B
💡 Solution & Explanation
Zinc salts decompose to leave a white residue of $ZnO$, which exhibits a characteristic colour change: it is yellow when hot and turns white when cold.
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