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One or More than One Options Correct Type
This section contains 4 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.
Q.
You have been provided with 10.00% by mass solution of ethanol in water.
At 15°C, density = 0.9831 g mL-1 
At 25°C, density = 0.9804 g mL-1 
Select the correct statement(s).
  • a)
    Molarity at 15°C is larger than that at 25°C
  • b)
    Molarity at 25°C is larger than that at 15°C
  • c)
    Molality at both temperatures are equal
  • d)
    Molality at 25°C is larger than that at 15°C
Correct answer is option 'A,C'. Can you explain this answer?
Verified Answer
One or More than One Options Correct TypeThis section contains 4multip...
(a, c)
10% ethanol by mass means
100 g (ethanol + water) solution has = 10 g ethanol
90 g H2O has ethanol = 10 g ethanol
Molality does not involve density, hence same at 15°C and 25°C.
Thus, (c) is correct.
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One or More than One Options Correct TypeThis section contains 4multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.Q.You have been provided with 10.00% by mass solution of ethanol in water.At 15C, density = 0.9831 g mL-1At 25C, density = 0.9804 g mL-1Select the correct statement(s).a)Molarity at 15C is larger than that at 25Cb)Molarity at 25C is larger than that at 15Cc)Molality at both temperatures are equald)Molality at 25C is larger than that at 15CCorrect answer is option 'A,C'. Can you explain this answer?
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