Osmosis

Q. Equal moles of benzene and toluene and makes the vapour pressure of benzene and toluene in pure state are 700 and 600 mmhg respectively the mole fraction of benzene in vapour state is

Q. 6. at 88degree celsius benzene has a vapour pressure of 900 torr and toluene has a vapour pressure of 360 torr what s the mole fraction of benzene in the mixture of toluene that will boil at 88degree celsius at 1atm pressure benzene - toluene form an ideal solution.

Q. Osmotic pressure of a solution containing 7 g of a protein per 100 mL of solution is 25 mm of Hg at${37}^{0}C$. Calculate the molecular mass of protein. R= 0.082 L atm $mo{l}^{-1}{K}^{-1}$.

1. $10050g/mol$
2. $92432g/mol$
3. $25743g/mol$
4. $54094g/mol$

Q.

The boiling point of C6H6 , CH3OH , C6H5NH2 and C6H5NO2 are 800C , 650C , 1840C and 2120C respectively. Which will show highest vapour pressure at room temperature?

1. C6H5NO2

2. C6H6

3. CH3OH

4. C6H5NH2

Q.

Assertion (A) When a solution is separated from the pure solvent by a semipermeable membrane, the solvent molecules pass through it from pure solvent side to the solution side.
Reason (R) Diffusion of solvent occurs from a region of high concentration solution to a region of low concentration solution.

Q. What happens when a cell is placed in a hypertonic solution?

1. There will be a net flow of water out of the cell, and the cell will lose volume.
2. There will be a net flow of water into the cell, and the cell will gain volume.
3. There will be no net flow of water into or out of the cell, and the cell’s volume will remain stable.
4. None of the above

Q. correct observation .1)0.1M urea , 2) 0.1M Nacl , 3) 0.1M cacl2 a)vapour pressure of 1 is lowest b)relative lowerimg of vapour pressure is maximum in 3 c)freezing poimt is maximum for 3 d)boilimg point is minimum for

Q.

What happens when rheo leaves are boiled in water first and then a drop of sugar syrup is put on it?

Q.

What are some examples of osmosis in real life?

Q. Which of the following is true for osmosis?

1. Solute molecules move from higher to lower concentration
2. Solvent molecules move from higher concentration to lower concentration
3. Solvent molecules move from lower to higher concentration
4. Solute molecules move from lower to higher concentration

Q.

Which of the following statements is false?
(a) Units of atmospheric pressure and osmotic pressure are the same
(b) In reverse osmosis, solvent olecules move through a semipermeable membrane from a region of lower concentration of solute to a region of higher concentration.
(c) The value of molal depresiion constant depends on nature of solvent
(d) Relative lowering of vapour pressure, is a dimensionless quantity

Q. Benzene and chloroform are mixed together. Mole fraction of benzene is 0.45.calculate %by mass of benzene.

Q.

The osmotic pressure of a solution depends on

1. Temperature.

2. Nature Of Solvent

3. Molar Concentration Of Solute.

4. Both A and C.

Q. After removing the outer shell of the 2 eggs in dilute HCl one is placed in distilled water and the other in a saturated solution of NaCl what will you observe and why?

Q.

Two solutions $S_1$ and $S_2$ containing 0.1 M NaCl (aq) and 0.05 M $BaC{l}_2\left(aq\right)$ are separated by semipermeable membrane. Which among the following statement(s) is/are correct? (Assume complete dissociation of both the electrolytes).

1. S₁ and S₂ are isotonic
2. S₁ is hypertonic while S₂ is hypotonic
3. S₁ is hypertonic while S₂ is hypertonic
4. Osmosis will take place from S₁ to S₂

Q. Osmosis occurs only with water or aqueous solutions.

1. True
2. False

Q.

Question 46
Give an example of a material used for making semipermeable membrane for carrying out reverse osmosis.

Q.

Question 12
An unripe mango placed in a concentrated salt solution to prepare pickle shrivels because .............. .
(a) it gains water due to osmosis
(b) it loses water due to reverse osmosis
(c) it gains water due to reverse osmosis
(d) it loses water due to osmosis

Q.

Two solutions A and B are separated by semi- permeable membrane. If liquid flows form A to B then

1. A is less concentrated than B

2. Both have same concentration
3. A is more concentrated than B

4. None of these

Q.

Question 59
When kept in water, raisin swells in size. Name and explain the phenomenon involved with the help of a diagram. Give three applications of the phenomenon.

Q.

The process of movement of solvent through a semipermeable membrane from the solution to the pure solvent by applying excess pressure on the solution side is called

1. Diffusion

2. Osmosis

3. Reverse osmosis

4. Association

Q.

Semipermeable membrane is that which permits the passage of:

1. Solute molecules only
2. Solvent molecules only
3. Solute and solvent molecules both
4. Neither solute nor solvent molecules

Q. Explain why water does not gather in the hollowed out portions of A and D.

1. In A no concentration gradient occurs, in D no semipermeable membrane present
2. In A no semipermeable membrane, in D no concentration gradient
3. Both A and B
4. None of these

Q.

Which of the following components form an ideal solution?

1. Ethyl alcohol and benzene

2. Water and nitric acid

3. Acetone and aniline

4. Benzene and toluene

Q. Which of the following is required for osmosis to take place?

1. Semi-permeable membrane
2. Same concentration of solvent
3. High temperature
4. Pressure greater than osmotic pressure

Q.

Give reasons: Wilted lettuce leaves become crisp when placed in cold water for a while.

Q.

If you are provided with some vegetables to cook. You generally add salt into the vegetables during cooking process. After adding salt, vegetables release water. What mechanism is responsible for this?

Q.

What is the meaning of plasmolysis?

Q. What is the difference between concentrated, aqueous and dilute solution?

Q.

A solution of ethanol, C₂H₅OH, is prepared by dissolving 25.0 mL of ethanol in enough water to give a total volume of 250.0 mL. What is the volume percent of ethanol?

1. 10.0 %

2. 225 %

3. 9.09 %

4. 1.00 %