Which among the following is NOT a constituent of gun-powder?

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SSC Selection Post - 2019

General Science

Which among the following is NOT a constituent of gun-powder?

This question was previously asked in

SSC Selection Post 2019 Graduation Level Question Paper (16 Oct, 2019) (Shift 3)

Charcoal

Calcium Carbonate

Sulfur

Potassium nitrate

The correct answer is

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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