Which one among the following is used in making gunpowder ?

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Q: 22 (NDA-I/2015)

Which one among the following is used in making gunpowder ?

question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,38,24,15,38,8,1

keywords: 

{'magnesium sulphate': [0, 0, 1, 1], 'calcium sulphate': [0, 1, 1, 7], 'gunpowder': [0, 0, 0, 1], 'potassium nitrate': [0, 0, 1, 2], 'sodium stearate': [0, 0, 0, 1]}

Option 1: Magnesium sulphate is not used in making gunpowder. Magnesium sulphate is commonly known as Epsom salt and is used for various purposes such as relieving muscle aches and as a fertilizer.

Option 2: Potassium nitrate is the correct answer. This compound, also known as saltpeter, is a key ingredient in gunpowder. It provides the oxygen necessary for the combustion reaction that propels the bullet or projectile.

Option 3: Sodium stearate is not used in making gunpowder. Sodium stearate is a common ingredient in soap and is used as a lubricant and emulsifier.

Option 4: Calcium sulphate is not used in making gunpowder. Calcium sulphate is commonly known as gypsum and is used in building materials and as a food additive.

Therefore, the correct answer is option 2, Potassium nitrate.