Imat 2017 question 48

Practice Question Solving
1

Consider the following list of particles:

  1. molecules
  2. ions
  3. single atoms
    Which one of the following options correctly describes the particles that are present in an
    aqueous solution of sodium chloride?
    A. 1 and 2 only
    B. 1, 2 and 3
    C. 3 only
    D. 1 only
    E. 2 only

Hi, can someone please explain why the answer for this question is A? I don’t get why 1 is correct as I thought ionic compounds cannot be molecules. Also could you explain why 3 is wrong? Thank you

2

Hi!
Sodium chloride will dissociate into sodium and chloride ions.
In the aqueous solution we also have water molecules.
We do not however have any free single atoms. So only 1 and 2 are correct thus A is the correct answer.
Hope it helps:)

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