The refractive index measures how much light bends or slows down as it enters a medium. It is crucial in forensic glass analysis to compare refractive properties of glass fragments at crime scenes.
Europium (Eu) resembles Calcium (Ca) in the following ways:
(A). Both are diamagnetic
(B). Insolubility of their sulphates and carbonates in water
(C). Solubility of these metals in liquid NH3
(D). Insolubility of their dichlorides in strong HCI
Choose the correct answer from the options given below: