(i) \[\mathbf{2}:\text{ }\mathbf{3}\]
We know that
Duplicate ratio of \[2:\text{ }3\text{ }=\text{ }{{2}^{2}}:\text{ }{{3}^{2}}~=\text{ }4:\text{ }9\]
(ii) \[\surd \mathbf{5}:\text{ }\mathbf{7}\]
We know that
Duplicate ratio of \[\surd 5:\text{ }7\text{ }=\text{ }\surd {{5}^{2}}:\text{ }{{7}^{2}}~=\text{ }5:\text{ }49\]