Where in the laboratory is long, unrestrained hair most likely to be a safety concern?
near an open flame
close to a fume hood
next to a concentrated sodium chloride solution
by a cabinet that contains flammable liquids

Option (a) is the correct answer.

Explanation:

Near an open flame the long, unrestrained hair is most likely to be a safety concern because hair catches fire very easily. Therefore, in the laboratories it is usually advised to tie your hairs properly in order to avoid any kind of accident.

There are also many chemicals that too can burn hairs but since they are kept in bottles therefore, they don't cause any harm as long as the bottle is in place.

Thus, we can conclude that near an open flame we should work more carefully.

answer: option (b) is the correct answer.

explanation:

a covalent bond is formed by sharing of electrons. whereas polarity arises due to difference in electronegativity of two atoms.

therefore, more is the electronegativity of an atom which combines with the titanium, more readily it will induce a partial positive and negative charge.

thus, out of the given options fluorine is most electronegative and has an incomplete octet. therefore, it will readily combine with titanium to share the electrons and complete its octet.