Q.

Statement I:One molar aqueous solution (d=1gm/cc) has always higher concentration than one molal.
Statement II: The molality of a solution does not depends on temperature whereas molarity depends

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a

Statement I and Statement II are true.

b

Statement I is false and Statement II is true.

c

Statement I is true and  statement II is false.

d

Statement I and Statement II are false.

answer is A.

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Detailed Solution

(I)  

    consider 1 molal sol. of Glucose

   nsolute = 1  ,   Ws = 1(180) = 180g

   Wo =1000g

1 molal solution  means  1 mole solute present in 1000g of solvent

1 Molar solution  of Glucose:

                         ns =1 ,  Ws = 1(180) =180g

                         Vsol = 1000ml , dsol. =1g/cc

                          Wsol.  = 1000g, Wo = (1000-180) = 820g

1M sol. means 1 mole of solute in 820g of solvent

By comparing 1M & 1m sol. of Glucose,

\large \therefore

1M sol. is more concentrated than 1m sol.

(II)

 

\large molality\propto\frac{1}{W_{solvent}}

Wt. of substance is independent of Temperature

 

\large Molarity\propto\frac{1}{volume}

Vol. depends on Temp.

Molarity depends on Temp.

(I) &(II) are true

 

 

 

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