JEE Main 2014 (Offline) | Solutions Question 127 | Chemistry

Consider separate solutions of 0.500 M C₂H₅OH(aq), 0.100 M Mg₃(PO₄)₂(aq), 0.250 M KBr(aq) and 0.125 M Na₃PO₄(aq) at 25^oC. Which statement is true about these solutions, assuming all salts to be strong electrolytes?

0.125 M Na₃PO₄(aq) has the highest osmotic pressure.

0.500 M C₂H₅OH(aq) has the highest osmotic pressure

They all have the same osmotic pressure

0.100 M Mg₃(PO₄)₂(aq) has the highest osmotic pressure.

AIEEE 2012

MCQ (Single Correct Answer)

-1

K_f for water is 1.86K kg mol^–1. If your automobile radiator holds 1.0 kg of water, how many grams of ethylene glycol (C₂H₆O₂) must you add to get the freezing point of the solution lowered to –2.8^oC ?

72 g

93 g

39 g

27 g

AIEEE 2011

MCQ (Single Correct Answer)

-1

The degree of dissociation ($$\alpha$$ ) of a weak electrolyte, A_xB_y is related to van’t Hoff factor (i) by the expression :

$$\alpha = {{i - 1} \over {x + y + 1}}$$

$$\alpha = {{x + y - 1} \over {i - 1}}$$

$$\alpha = {{x + y + 1} \over {i - 1}}$$

$$\alpha = {{i - 1} \over {(x + y - 1)}}$$

AIEEE 2011

MCQ (Single Correct Answer)

-1

Ethylene glycol is used as an antifreeze in a cold climate. Mass of ethylene glycol which should be added to 4 kg of water to prevent it from freezing at −6^oC will be : [K_f for water = 1.86 K kg mol⁻¹ , and molar mass of ethylene glycol = 62 g mol⁻¹ )

204.30 g

400.00 g

304.60 g

804.32 g

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