In this type of questions, a statement of assertion 
is followed by a statement of reason
(R). Mark the correct choice as :
Assertion : Relative lowering of vapour pressure is directly proportional to the number of ions present in the solution.
Reason : The vapour pressure of 0.1 M sugar solution is less than that of 0.1 M potassium chloride solution.
Text Solution
Verified by ExpertsC
Relative lowering of vapour pressure is directly proportional to number of ions (i.e., 
) present in solution. Sugar is a non-electrolyte, however KCl is an electrolyte and dissociates in solution to give two particles (i.e., 
). Hence, there is greater relative lowering of vapour pressure in case of KCl . Thus, the vapour pressure of 0.1 M sugar solution is more than that of 0.1 M potassium chloride solution.
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