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Earn 100

How many grams of KCl should be added to 1000 g of water, so that the freezing point reduces to 10 °C?

(Kf =1.86 ºC kg mol-1).

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Important Questions on Solutions

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Identify the compound amongst the following of which 0.1 M aqueous solution has highest boiling point.
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The boiling point of water (100°C) becomes 100.52°C, if 3 g of a non-volatile solute is dissolved in 200 mL of water. The molecular weight of solute is________. (Kb for water is 0.6 K kg mol-1)
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The freezing point of equimolal aqueous solution will be the highest for______.
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A 0.2 molal aqueous solution of a weak acid (HX) is 20% ionised. The freezing point of this solution is______.
(Given Kf=1.86°C/m for water)
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If M, W and V represent molar mass of solute, mass of solute and volume of solution in litres, respectively, which among following equations is TRUE?
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The osmotic pressure of solution containing 34.2 g of cane sugar (molar mass =342 g mol-1) in 1 L  of solution at 20°C is______ (Given: R=0.082 L atm K-1 mol-1)
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30×10-4 kg of urea dissolved in water to make 500 mL aqueous solution and this solution is isotonic with cane-sugar solution. How much mass of cane sugar in its one litre solution? 
(H=1, N=14, O=16, C=12)
 
MEDIUM
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The volume of ethyl alcohol (density 1.15 g/cc) that has to be added to prepare 100 cc of 0.5 M ethyl alcohol solution in water is______.