In this type of questions, a statement of assertion 
is followed by a statement of reason
(R). Mark the correct choice as :
Assertion : When a concentrated solution is diluted by adding more water, the number of moles of solute in the solution remains unchanged.
Reason : Number of moles of a solute are equal to the product of molarity and volume of solution in litres.
Text Solution
Verified by ExpertsB
Moles of solute are equal to product of molarity and volume (i.e., 
) and when we add more solvent, the volume increases but the molarity decreases correspondingly so that their product i.e., the total numbers of moles remains constant.
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