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Physical and Chemical Changes — CHEMISTRY STD 8 — Question

ICSE BoardEnglish MediumSTD 8CHEMISTRYPhysical and Chemical Changes2 Marks
Question
A bright light is seen evolved when a strip of magnesium is heated.
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Answer

Magnesium is heated producing a bright light to form $\ce{MgO}$ in air is a chemical change as the composition changes $\ce{(MgO}$ white powder$)$ is formed, is irreversible. We cannot get magnesium back from $\ce{MgO}$.

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