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Question

Assertion :One molar aqueous solution is more concentrated than that of 1 molal aqueous solution. Reason: Molarity is a function of temperature as volume depends on temperature

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
M=MolesofsoluteVolumeofsolution(litres)
Molality=MolesofsoluteMassofsolvent(kg)
1 molar aqueous solution is more concentrated than 1 molal aqueous solution because 1 molar solution contain 1 mole solute in 1 litre solution which include both solute and solvent. So, the mass of the solvent is less than 1000 g. Therefore, 1 molar aqueous solution contain 1 mole of solute in less than 1000 g of solvent while. 1 molal solution has 1 mole of solute in 1000 gram of solvent. Hence, concentration will be more in 1 molar solution.
Also, molarity is a function of temperature as volume depends upon temperature
Ex. Osmotic pressure equation π=iCRT
C1T where C is concentration.

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