Assertion: One molal aqueous solution of glucose contains 180g of glucose in 1 kg water.
Reason: Solution containing one mole of solute in 1000 g of solvent is called one molal solution.
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(c) If the Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.
(e) If the Assertion is incorrect but the Reason is correct.
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
Explanation:
Molality = No. of moles of solute/Wt of solvent in kg.
Here, No. of moles = Molecular mass/Wt of solvent
= 180/180 = 1
∴ Molality = 1/1 = 1
Hence assertion and reason, both are correct, and reason is the correct explanation of assertion.