What is a mixture of potassium natrate, powdered charcoal and sulphur called?

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Q: 34 (NDA-I/2008)
What is a mixture of potassium natrate, powdered charcoal and sulphur called?
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question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,27,17,2,7,8,27

keywords: 

{'powdered charcoal': [0, 0, 1, 0], 'mixture': [0, 0, 1, 5], 'gun powder': [0, 0, 1, 1], 'potassium natrate': [0, 0, 1, 0], 'cement': [0, 0, 1, 4], 'sulphur': [0, 0, 0, 2], 'paint': [0, 0, 1, 4], 'glass': [0, 0, 1, 4]}