**Question:**Select the rule about safe Bunsen burner use that is incorrect.**Answer Options:**- ○ Turn off the gas if the Bunsen burner flame extinguishes.- ○ If the Bunsen burner has been ignited and the odor of natural gas is still evident, turn off the burner.- ○ Be sure that the hose fits the burner inlet and gas valve outlet securely.- ○ All of the choices are correct.**Explanation:**This question asks students to identify which rule concerning the safe use of a Bunsen burner is incorrect. It's important for safety that students understand the correct procedures when working with such equipment. Each option highlights a safety practice related to handling gas and burner fittings. The aim is to ensure awareness and prevent accidents in a laboratory setting.

a) Turn off the gas if the Bunsen burner flame extinguishes: Correct The given statement is correct because if you will not turn off the burner once the flame extinguishes, the gas will spill out and that could be dangerous.b) If the bunsen burner has been ignited and the odor of the natural gas is still evident, turn off the burner- Correct The given statement is correct, because odor of natural gas evident when the bunsen burner is ignited implies some leakage of the gas, so the burner should be turned off for the safety purpose.c) Be sure that the hose fits the burner inlet and gas valves outlet securely- CORRECT The given statement is correct because if the hose does not fit the burner valves securely then there is chances of gas leakage.all the given statements are correct. So, option d All of the choices are correct is the right answer