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

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

Gun power which is used in fireworks rockets consists of a mixture of charcoal , sulphur and potassium nitrate .
Hence d is the correct answer.