Chemistry - Study Mode

[#911] Which of the following methods is used in determining the number average molar mass of a macromolecule?
Correct Answer

(B) Osmotic pressure

Explanation

Solution: Osmotic pressure method is the best method for the determination of molecular weight of polymers and proteins, since osmotic pressure, though very small, is measurable.

[#912] Molality of pure water is
Correct Answer

(D) 55.5

Explanation

Solution: Just like there's a real molar concentration for water by itself ( 55.348 M ), there is a real molality for water by itself ( 55.510 m ).

[#913] A solution is
Correct Answer

(A) A homogeneous mixture of two or more substances

Explanation

Solution: In chemistry, a solution is a special type of homogeneous mixture composed of two or more substances.

[#914] Which one is the most dense liquid from the below?
Correct Answer

(B) Choloform

Explanation

Solution: Choloform is the most dense liquid from below.

[#915] Which of the following partially miscible liquid pairs has both lower and upper critical solution temperature?
Correct Answer

(C) Glycerine and m-toluene

Explanation

Solution: Glycerine and m-toluene has both lower and upper critical solution temperature.