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Q1. The values of observed and calculated molecular weights of calcium nitrate are respectively 65.6 and 164. The degree of dissociation of calcium nitrate will be :
•  60%
•  50%
•  25%
•  75%
Solution

Q2.The molar freezing point constant for water is 1.86°C/mol. If 342 g of cane sugar (C_12 H_22 O_11) is dissolved in 1000 g of water, the solution will freeze at
•  2.42℃
•  -1.86℃
•  1.86℃
•  -3.92℃
Solution

Q3.  An 1% solution of KCl (I), NaCl (II), BaCl_2 (III) and urea (IV) have their osmotic pressure at the same temperature in the ascending order (molar masses of NaCl, KCl, BaCl_2 and urea are respectively 58.5, 74.5, 208.4 and 60 g mol^(-1)). Assume 100% ionisation of the electrolytes at this temperature
•   I< III< II< IV
•  III< I <II< IV
•  I <II <III <IV
•
 III< IV< I
Solution

Q4. Which has the highest freezing point at one atmosphere?
•  0.1 M NaCl solution
•  0.1 M FeCl_3 solution
•  0.1 M BaCl_2 solution
•  0.1 M sugar solution
Solution
Lesser is ∆T_f, more is freezing point.

Q5.The amount of anhydrous Na_2 CO_3 present in 250 mL of 0.25 M solution is
•  6.625 g
•  66.25 g
•  662.5 g
•  6625 g
Solution
A

Q6. Solution A contains 7 g/L of MgCl_2 and solution B contains 7 g/L of NaCl. At room temperature, the osmotic pressure of
•  25
•  102
• 50
•  180
Solution

Q7.Two liquids X and Y form an ideal solution at 300K, vapour pressure of the solution containing 1 mol of X and 3, mol of Y is 550 mmHg. At the same temperature, if 1 mol of Y is further added to this solution, vapour pressure of the solution increases by 10 mmHg. Vapour pressure (in mmHg)of Xand Y in their pure states will be, respectively
•  200 and 300
•  200 and 300
•  400 and 600
•  500 and 600
Solution

Q8.The freezing point of aqueous solution that contains 5% by mass urea, 1.0% by mass KCl and 10% by mass of glucose is : (K_f H_2 O=1.86 K molality^(-1))
•  250 K
•  269.93 K
•  285.5 K
•  290.2 K
Solution

Q9.The vapour pressure of benzene at 90°C is 1020 torr. A solution of 5 g of a solute in 58.5 g benzene has vapour pressure 990 torr. The molecular weight of the solute is :
•  78.2
•  178.2
•  206.2
•  220
Solution

Q10. The elevation in boiling point of a solution of13.44 g of CuCl_2in 1 kg of water using the following information will be (molecular weight of CuCl_2=134.4 and k_b=0.52 Km^(-1))
•  0.05
•  0.16
•  0.1
• 0.2
Solution

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