Blasting powder is a mixture of _____________
(a) Charcoal, sulphur and saltpetre
(b) Aluminium, phosphorus and saltpetre
(c) Charcoal, calcium and phosphorus
(d) Sodium, sulphur and alum
I have been asked this question in unit test.
Asked question is from Stones topic in portion Air Conditioning, Thermal Insulation, Stones & Ferrous Metals of Construction & Building Materials