Which of the following mixtures could not be separated by filtration? salty water muddy water orange juice with pulp in it dusty air

Option (a) is the correct answer.

Explanation:

Filtration is a technique or process in which solid that is suspended in a liquid is separated from the liquid.

For example, a muddy water can be filtered as particles of mud can be separated from the water.

Particles of salt being ionic in nature completely dissolve in water and it forms a homogeneous solution. Therefore, a mixture of salt water cannot be separated.

Thus, we can conclude that out of the given options salty water is the mixture which cannot be separated by filtration.

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.