Answer: Option (A) is the correct answer.
Explanation:
While performing an experiment in a laboratory it is safe to tie back long hair and loose clothing because if hairs are kept open during an experiment then it is possible that it will catch fire and can lead to a miss-happening.
Whereas loose clothes should be preferred so that the person who is performing the experiment should feel comfortable. If a person is wearing tight clothes, then the person will not feel comfortable.
Eating or drinking from laboratory glassware is dangerous as they laboratory glassware are not necessarily washed properly. So, it does contain some amount of chemicals in it as a result, they cannot be used.
Touching hot objects with your bare hands can lead to burning of skin. Hence, it should be avoided.
Testing an odor by directly inhaling the vapor should be avoided as by inhaling a reagent in laboratory we intake the reagent into our digestive system which can be very harmful.
Thus, we can conclude that out of the given options, tying back long hair and loose clothing is an example of a safe laboratory procedure.
