The standard water-to-plaster ratio is 2:3, ensuring the right consistency for strong and workable molds. Other ratios result in weak or unworkable mixtures.
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: