Question

1.If a solution is saturated, undissolved solute must be visible.

TRUE or FALSE

2. which of the following solutions would be hypotonic relative to red blood cells?

isotonic saline solution, 0.20 M saline solution, 0.25 osmol saline solution, 0.99% saline solution

3. In the redox reaction BaSO4 + 4C ---> BaS + 4CO the reducing agent is

BaSO4, C, BaS, CO

4. Which of the following solutions has an osmolarity of 3.0 osmol?

1.5 M glucose, 1.5 M NaCl, 1.0 M Na3PO4, 3.0 M KBr

Answer 1

1. False   (because saturated solution means maximum amount of salt is dissolved.no more solute will be soluble.so that undissolved solute will be not visible)

2. no clear information

3. BaSO4 + 4C ---> BaS + 4CO

reducing agent : the compound(or) element which involves in oxidation acts as reducing agent.

answer: C

4. osmolarity = i*molarity

    i = vanthoffs factor = 2

   osmolarity = 2*1.5 = 3 osmol

answer: 1.5 M NaCl