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Question

Reason
Solution containing one mole of solute in $$1000 \,g$$ solvent is called as one molal solution.
Assertion
One molal aqueous solution of urea contains $$60 \,g$$ of urea in $$1 \,kg (1000 \,g)$$ water.
One molal aqueous solution of urea contains $$60 \,g$$ of urea in $$1 \,kg (1000 \,g)$$ water.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B
Assertion is correct but Reason is incorrect
C
Both Assertion and Reason are incorrect
D
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Solution
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Correct option is A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Molecular weight of urea $$(NH_2CONH_2) = 14 + 2 + 12 + 16 + 14 + 2 = 60$$

Number of moles $$= \dfrac {Weight}{molecular \,weight} = \dfrac {60}{60} = 1$$

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Solution containing one mole of solute in $$1000 \,g$$ solvent is called as one molal solution.
Assertion
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