Question

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substance which does not vapourise and hence does not produce a flame​

Answer 1

Explanation:

Coal is the substance which does not vapourises and doesn't pdoduces flame

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Answer 2

Answer:coal

Explanation:Coal does not produce flame when burnt because it does not vapourizes, only those substances which vapourizes on burning produce flame like wax , natural gas. Substances that undergoes rapid combustion have lower ignition temp..and coal do not vaporize while burning that's why does not produce flame.