What is a mixture of potassium nitrate Charcoal and Sulphur called...? Mcqs

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What is a mixture of potassium nitrate Charcoal and Sulphur called...?

(A) Paint

(B) Aluminum

(C) Brass

(D) Gunpowder

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Source: This question is taken from the Sub Inspector BS 14 (open Marit) 2016

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