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Chemistry

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What is the basic theme of organisation in the periodic table?

“तत्त्वों के गुणधर्म उनके परमाणु क्रमांक के आवर्त फलन होते हैं।”(The properties of elements are a periodic function of their...

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23. 200 mL of an aqueous solutions of a protein contains is 1.26 g. The Osmotic Pressure of this solution at 300 K is found to be

2.57 x 10 -3  bar. The molar mass of protein will be a. 31011 g mol -1 b. 61038 g mol...

25. What is the osmotic pressure of a 0.0020 mol

dm-3   sucrose solution at 20 ° C (molar gas constant, R = 8.314 JK -1 mol -1  ; 1 dm-3 ...

24. 0.1 M NaCl and 0.05 M

BaCl2   solutions are separated by a semi permeable membrane in a container. For this system choose the correct answer. a....

35. Blood is isotonic with

a. 0.16 M NaCl b. Conc. NaCl c. 50% NaCl d. 30% NaCl Ans. a Explanation : 9g of NaCl...

32. Which of the following statement is false

a. Units of atmospheric pressure and osmotic pressure are the same b. In reverse osmosis, solvent molecules move through a...

41. If molecular weight of compound is increased then sensitivity is decreased in which of the following methods

a. Elevation in boiling point b. Viscosity c. Osmosis d. Dialysis Ans. d   (11)

40. Solution A contains 7 g/L of

MgCl2  and solution B contains 7 g/L of NaCl. At room temperature, the osmotic pressure of a. Solutions A is...

39. At low concentrations the statement that equimolal solutions under a given set of experimental conditions have equal osmotic pressure is ture for

a. All solutions b. Solutions of non-electrolytes only c. Solutions of electrolytes only d. None of these Ans. b Explanation...

38. Which of the following associated with isotonic solutions, is not correct

a. They will have the same osmotic pressure b. They have the same weight concentrations c. Osmosis does not take...

37. Osmotic pressure of a solution can be measured quickly and accurately by

a. Berkeley and Hartley’s method b. Morse’s method c. Pfeffer’s method d. De Vries method Ans. a (13)

36. Which inorganic precipitate acts as semipermeable membrane.

a. Calcium sulphate b. Barium oxalate c. Nickel phosphate d. Copper ferrocyanide Ans.d Explanation : Copper ferrocyanide ppt. acts as...

34. The osmotic pressure of 0.4 % urea solution is 1.66 atm and that of a solution of sugar of 3.42 % is 2.46 atm. When equal volume of both the solution are mixed then the osmotic pressure of the resultant solution will be

a. 1. 64 atm b. 2.46 atm c. 2.06 atm d. 0.82 atm Ans. c (16)

31. 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...

30. The empirical formula of a non-electroyte is

CH2 O . A solution containing 6g of the compound exerts the same osmotic pressure as that of 0.05 M...

29. A solution containing 10g per

dm3 of urea (molecular mass = 60 gmol-1 ) is isotonic with a 5% solution of a non volatile solute. The molecular...

28. Osmotic pressure of the solution can be increased by

a. increasing the temperature of the solution b. Decreasing the temperature of the solution c. Increasing the volume of the...

27. Desalination of sea water can be done by

a. Osmosis b. Reverse osmosis c. Filtration d. Diffusion Ans. b (11)

26. For gettting accurate value of molar mass of a solute by osmotic pressure measurement

a. The solute must be volatile b. The solution concentration must be high c. The solute  should undergo dissociation d....

3. The osmotic pressure of a 5% (wt/vol) solution of cane sugar at

150 ° C is a. 2.45 atm b. 5.078 atm c. 3.4 atm d. 4 atm Ans. b (35)

7. Which one of the following mixtures can be separated into pure components by fractional distillation

a. Benzene – toluene b. Water – ethyl alcohol c. Water – nitric acid d. Water – hydrochloric acid Ans....

5. Which will form maximum boiling point azeotrope

a. HNO3  +  H2 O  solution b.  C2 H5 OH + H2  O solution c. C6 H6  + C6 H5 ...

4. A mixture of two completely miscible non-ideal liquids which distil as such without change in its composition at a constant temperature as thought it were a pure liquid. This mixture is known as

a. Binary liquid mixture b. Axzeotropic mixture c. Eutectic mixture d. Ideal mixture Ans. b (8)

2. An azeotropic solution of two liquids has boiling point lower then either when it

a. Shows a negative deviation from Raoult’s law b. Shows no deviation from Raoult’s law c. Shows positive deviation from...

23. Liquids A and B form an ideal solution in the entire composition range. At 350 K, the vapour pressures of pure A and pure B are 7 x

103  Pa and  12 x 103  Pa, respectively. The containing 40 mole percent of A at this temperature is :...

17. Formation of a solution from two components can be considered as

i.  Pure  solvent  →   separated  solvent molecules  ΔH1 ii. Pure solvent  →   separated  solvent molecules  ΔH2 iii. Separated solvent and...

16. Which one of the following is incorrect for ideal solution

a.   ΔG mix  = 0 b. ΔH mix  = 0 c. ΔU mix  = 0 d. ΔP =  P obs  – P calculated by...

21. The solution containing 4.0gm of a polyvinyl chloride polymer in 1 liter of dioxane was found to have an osmotic pressure

6.0 x 10 -4  atmosphere at 300K, the value of R used is 0.082 litre atmosphere  K . The molecular -1  K...

19. Osmotic pressure of a urea solution at

10 ° C  is 500 mm. Osmotic pressure of the solution become 105.3 mm. when it is dilute and temperauter...

18. Two solutions of

KNO3  and CH3 COOH  are prepared separately. Molarity of both is 0.1 M and  osmotic pressures are  P1 and P2...

17. A solution containing 10 g per

dm3  of urea is isotonic with a 5 % solution of a nonvolatile solute. The molecular mass of this nonvolatile...

16. Which has minimum osmotic pressure

a. 200 mL of 2 M NaCl solution b. 200 mL of 1 M glucose solution c. 200 mL of...

15. A 5 solution of sugarcane is isotonic with 1 % solution of X under similar conditions. the mole.wt. of X is

a. 136. 2 b. 68.4 c. 34.2 d. 171. 2 Ans. b (8)

14. A 0.6 % solution of urea would be isotonic with

a. 0.1M gulcose b. o.1 M KCl c. 0.6% glucose solution d. 0.6 % KCl solution Ans. a Explanation :...

13. Isotonic solutions have

a. Equal temperature b. Equal osmotic pressure c. Equal volume d. Equal amount of solute Ans. b (5)

12. What would happen if a thin slice of suger beet is placed in a concentrated solution on NaCl

a. Sugar beet will lose water from its cells b. Sugar beet will absorb water from solution c. Sugar beet...

11. A 5.25% solution of a substance is isotonic with a 1.5 % solution of urea in the same solvent. If the densities of both the solutions are assumed to be equal to 1.0

gcm-3 , molar mass of the substance will be a. 90.0 g mol -1 b. 115.0 g mol -1 c. 105.0 gmol -1 d....

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