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| Q.31 | Which of the following chemicals are vastly used in gunpowder of fireworks? | |
| Ans | 1. Potassium sulphate and Phosphorous | |
| 2. Potassium nitrate, sulphur and charcoal | ||
| 3. Silver nitrate and sulphur | ||
| 4. Silver nitrate and charcoal |
Correct Ans: 2
