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Q71
(CDS-II/2026)
Science & Technology › Basic Science (Physics, Chemistry, Biology)
Concentration of a solution can be expressed in :
1. Molarity
2. Molality
Select the answer using the code given below :
Result
Your answer:
—
·
Correct:
C
Explanation
Concentration of a solution refers to the amount of solute present in a given quantity of solvent or solution. Both Molarity and Molality are standard units used for this purpose:
- Molarity (M): Defined as the number of moles of solute dissolved in one litre (1 L) of solution. It is temperature-dependent because the volume of a liquid can change with temperature.
- Molality (m): Defined as the number of moles of solute per kilogram (1 kg) of solvent. It is independent of temperature because it is based on mass, which does not change with temperature.
Other ways to express concentration include Normality, Mole Fraction, and Mass Percentage. Since both Molarity and Molality are valid expressions, the correct answer is Both 1 and 2.
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