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Stoichiometry

Q1: Pick out the wrong statement.

A The evaporation of aqueous solution of glucose causes its molarity to increase.

B Both the freezing point as well as boiling point of sea water is more than that of distilled water.

C The solution containing equal masses of two liquids 'X' and 'Y' has the same mole fraction of' 'X' and 'Y'.

D both (b) and (c)

ANS:D - both (b) and (c)

The wrong statement is: "The solution containing equal masses of two liquids 'X' and 'Y' has the same mole fraction of 'X' and 'Y'." This statement is incorrect. The mole fraction of a component in a solution depends not only on its mass but also on its molar mass and the total moles of the solution. Consider two liquids, X and Y, with different molar masses. If equal masses of X and Y are mixed, the number of moles of each component will be different since they have different molar masses. Consequently, the mole fraction of X and Y will be different. The correct statement is: "The solution containing equal masses of two liquids 'X' and 'Y' does not necessarily have the same mole fraction of 'X' and 'Y'." Therefore, the option "both (b) and (c)" is the incorrect statement.



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