i'm pretty sure the answer you chose is correct
The dust particles in the water can be helped to settle down faster by Alum.
So, your answer is option B. Alum.
Hope this helps!
D Snack Mix because they are individual parts that can easily be seperated
<u>Answer:</u> The correct option is 1 mole of acetic acid was required for 2 moles of sodium bicarbonate
<u>Explanation:</u>
We are given:
Average number of drops of sodium bicarbonate = 142
The chemical equation for the reaction of sodium bicarbonate and acetic acid in vinegar follows:

From the stoichiometry of the reaction:
1 mole of sodium carbonate reacts with 1 mole of acetic acid in vinegar.
Hence, the correct option is 1 mole of acetic acid was required for 2 moles of sodium bicarbonate