The number of parts in a slip casting mold depends on the design's complexity. Simple shapes may require just two parts, while complex designs need more. There is no fixed number of parts, as it is always "as per the need."
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: