(C) The molarity $(M)$ is defined as the number of moles of solute per litre of solution.Number of moles of urea = $\frac{\text{Given mass}}{\text{Mol

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(C) The molarity $(M)$ is defined as the number of moles of solute per litre of solution.Number of moles of urea = $\frac{\text{Given mass}}{\text{Molar mass}} = \frac{6 \ g}{60 \ g/mol} = 0.1 \ mol$.Since the volume of the solution is $1 \ L$,the molarity is $M = \frac{0.1 \ mol}{1 \ L} = 0.1 \ M$.Therefore,the correct option is $C$.