Q21Short answer
Boojho wants to separate the following materials as combustible and non-combustible. Can you help him? Charcoal, chalk, stone, iron rod, copper coin, straw, cardboard, glass, paper, candle, wood.
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(a) Combustible — charcoal, straw, card board, paper, candle wood, (b) Non-combustible — chalk, stone, iron rod, copper coin, glass.