Normality
Normality is a Science & Technology concept from the MPSC syllabus, tested in 2 past MPSC questions (2021, 2023). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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Real questions that test this
1.5M H₂SO₄ च्या 10 dm³ द्रावणापासून 1.0N H₂SO₄ चे द्रावण कसे बनवाल ? How is 1.0N H₂SO₄ solution is prepared from 10 dm³ of 1.5M H₂SO₄ solution ?
Normality (N) = Molarity (M) x n-factor. For H2SO4, n-factor is 2, so 1.5M H2SO4 is 3.0N. Using dilution formula N1V1 = N2V2 (3.0 x 10 = 1.0 x V2), the final volume V2 must be 30 dm³. Since we already have 10 dm³, we need to add 20 dm³ of water.
समुद्रपातळीवर असलेल्या प्रयोगशाळेत वापरण्यासाठी, वर्षाच्या कोणत्याही दिवशी खालीलपैकी सगळ्यात योग्य संहति एकक/एकके _________ हे/ही आहे/आहेत. On any day of the year, to use in laboratories at sea level the most correct concentration unit/s is/are _________.
Molality is independent of temperature because it is expressed in terms of mass of solvent (kg), whereas molarity and normality depend on volume which varies with temperature.