Which among the following is NOT a constituent of gun-powder?
Calcium Carbonate
The correct answer is Calcium Carbonate.
Additional Information: Black Powder Chemistry The chemical reaction of gunpowder combustion is complex, but a simplified overall equation shows the reactants and main products: $$20\text{KNO}_3 + 32\text{C} + 6\text{S} \rightarrow 10\text{K}_2\text{CO}_3 + 6\text{K}_2\text{SO}_4 + 3\text{K}_2\text{S}_2\text{O}_3 + 2\text{K}_2\text{CO}_3 + 4\text{CO}_2 + 10\text{CO} + 16\text{N}_2$$ This reaction produces a large volume of hot gases ($$\text{N}_2$$, $$\text{CO}_2$$, $$\text{CO}$$) and solid residues ($$\text{K}_2\text{CO}_3$$, $$\text{K}_2\text{SO}_4$$, etc.). The rapid expansion of these gases is what provides the explosive force. Calcium carbonate does not participate in this reaction in a way that contributes to the explosive force and is therefore not included in the standard formulation.
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