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With what, magnesium ribbon is cleaned b...

With what, magnesium ribbon is cleaned before buning it in air.

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Magnesium ribbon should be cleaned before burning in air to remove any oxide layer formed on it, as oxide layer is insulating in nature which otherwise will slowdown the burning.
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CAUTION: This activity needs the teacher's assistance. It would be better if students wear suitable eyeglasses. • Clean a magnesium ribbon, about 3-4 cm Tong by rubbing it with sand paper. Hold it with a pair of tongs. Burn it using a spirit lamp or a burner and collect the ash so formed in a watch glass as shown in Fig. Burn the magnesium ribbon keeping it away as far as possible from your eyes. What do you observe ?