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Which of the following is not an ingredient in the preparation of fireworks ?

$(a)\;\text{Charcoal} \\ (b)\;\text{Sulphur} \\(c)\;\text{Potassium nitrate} \\ (d)\;\text{Soil} $

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Gun power which is used in fireworks rockets consists of a mixture of charcoal , sulphur and potassium nitrate .
Hence d is the correct answer.
answered Mar 7, 2014 by meena.p
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