CBSE Guess > Papers > Important Questions > Class XII > 2007 > Chemistry > Solutions

Solutions

1 MARK QUESTION

1. Distinguish betweenmolarity andmolality.
2. State Roult's law
3. Why is benzene insoluble in water but soluble in Toluene
4. Why is an increase in temperature observed on mixing chloroform with acetone
5. When is the value of Van't Hoff factor more than one.
6. Why is vapour pressure of solution of glucose in water lower than that of water
7. What is reverse osmosis
8. Give two example of gaseous solutions.
9. What are isotonic solutions
10. What is an azeotrope

2 MARK QUESTION

1. What is osmotic pressure How does it depend on temperature and atmospheric pressure.
2. Illustrate elevation in boiling point with the help of vapour pressure temperature curve of a solution. Show that elevation in boiling point is a colligative property.
3. What is meant by abnormal molecular mass. Illlustrate it with an exam ple
4. Calculate the amount of KCl which must be added to 1 kg of water so that the freezing point is depressed by 2 K [ Kf for water = 1.86 K Kg/ mol]
5. A solution containing 2.56 gm of sulphur in 100 g of carbon disulphide gave a freezing point lowering of 0.383 K Calculate the molecular formulae of Sulphur [ kf of carbon disulphide = 3.83 K kg/mol Atomic mass of S =32 amu]

3 MARK QUESTION

1. 10.0 gm of an organic substance when dissolved in 2 litres of water gave an osmotic pressure of 0.60 atm. at 27 C Calculate the molecular mass of substance.
2. Calculate the freezing oint of 1 molar aqueous solution [ density 1.04 gm/litre] of KCl,. Kf = 1.86
3. State Roult's law for solutions. Why do water and ethanol and chloro form and acetone solutions deviate from Roult's law? State the nature of deviations in each case and give reasons for it.
4. What is the molar concentration of solute particles in human blood if the osmotic pressure is 7 atm. at body temperature 37 C?
5. Explain the term pasmolysis of cell. How water rises from th soil to the top of very tall trees.

NOTE- 1MARK QUESTION (For slow Learners)

1. What is the effect of temperature on (a)morarity (b)molality
2. State henry’s law?
3. State raoult’s low ?
4. What is the ideal solution ?
5. State any two characteristics of ideal solution ?
6. What is non ideal solution ?
7. What type of non idealities are exhibited by clycohexane ethanol & aceton –chloroform mixtureres
8. What are a zeotrops ?
9. Give the example of each minimum boiling &maximum boiling ageotrops
10. What are the colligative propertion ?
11. Why do gases nearly tend to be less soluble in liquids as the temperature is raised?
12. Define (a) mole fraction (b) osmoticpressuere
13. What are molar elevation constant or ebulliozcopic constant?
14. Define molar depression constant or exyoscopic constant?
15. What type is vant half factor?
16. What is volume of vant half factor when the solute undergoes (a) association &(b) dissociation
17. Why is osmotic pressure considered a colligative property?
18. What is reverse osmosis?
19. Why is osmotic pressure of 1m kcal is higher then 1m urea solution? Important Question
20. Which out of morality & molality change with temperature &Why?
21. What is the normally of 0.3m aqueous solution of atribaric acid?
22. Del solution NH4clis greater then 0 what is the effect of temperature on its solubility?
23. Write mathematical expression for vaults law for the aqueous solution of non-volatile solute?
24. Define
    a. Molality
    b. Morality
    c. Mass percentage.
25. Written two application of Henrys law in industry &bilogical phenomena /
26. Write two types of solid solution?
27. Write differenciate between interestrial solid solution & substitunal solid solution with example?

1. Atomic Structure and Chemical Bonding
2. Solid State
3. Solutions
4. Thermodynamics
5. Electrochemistry
6. Chemical Kinetics
7. P Block Elements
8. D and F Block Elements
9. Nuclear Chemistry
10. Stereo Chemistry
11. Organic Functional Group I
12. Organic Functional Group II and III
13. Surface Chemistry
14. Chemistry In Every Day Life
15. Polymers
16. Practice Paper No.1
17. Practice Paper No.2
18. Practice Paper No.3
19. Practice Paper No.4