Which of the following is not true [Solved]

Question 1

Which of the following is not true?

a. The freezing point of sea water is lower than the freezing point of pure water.

b. The boiling point of a water sample from the Salt Lake is lower than the boiling point of pure water.

c. The freezing point of 0.1 M NaCl0.1 M NaCl is lower than the freezing point of 0.05 M NaCl0.05 M NaCl.

Question 2

Which of the following is not true about the molecule below?

Question 3

Which of the following is NOT true regarding… Which of the following is NOT true regarding the ethics committees at research institutions

Answer to question 1

For Option a

The freezing point of pure solvent is always greater than the freezing point of the solution with the same solvent. According to the colligative property of the solutions, when solute is added to any solvent its freezing point is decreased.

So, this statement is true that freezing point of sea water is lower than the freezing point of pure water.

For Option b

The boiling point of the solution is always greater than that of the solvent. According to the colligative properties of solutions, when solute is added to any solvent its boiling point is increased.

So, this statement is not true because, boiling point of sea water is greater than the boiling point of pure water.

For Option c

The freezing point of concentrated solution is always less than the freezing point of the solution having low concentration. Since, the concentrated solution will have higher amount of solute dissolved in it and according to the colligative property of solution, when solute is added to a solvent its freezing point is decreased.

So, this statement is true that the freezing point of 0.1MNaCl0.1MNaCl is lower than the freezing point of 0.05MNaCl0.05MNaCl.

Answer to question 2

Answer to question 3

option c

They approve and decline all studies. this option is incorrect as the committees does not approve all studies.

Other option are correct as it convey correct information about ethics committee.

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