The correct answer is: D. 10, 75, 15
Gunpowder is a mixture of three ingredients: charcoal, saltpetre, and sulphur. The proportions of these ingredients vary depending on the desired properties of the gunpowder. However, the most common proportions are 10:75:15 by weight.
Charcoal is a fuel that provides the oxygen necessary for the combustion reaction. Saltpetre is a source of nitrogen, which is also necessary for combustion. Sulphur is a catalyst that helps to speed up the combustion reaction.
When gunpowder is ignited, the charcoal and saltpetre react to form carbon dioxide and nitrogen gas. The sulphur reacts with the carbon dioxide to form carbon monoxide and sulphur dioxide gas. These gases expand rapidly, creating a pressure wave that propels the projectile.
The proportions of charcoal, saltpetre, and sulphur in gunpowder can be adjusted to achieve different results. For example, gunpowder with a higher proportion of charcoal will burn more slowly, while gunpowder with a higher proportion of saltpetre will burn more quickly. The proportions of the ingredients can also be adjusted to change the power of the gunpowder.
Gunpowder is a dangerous substance and should only be handled by trained professionals.