Economies of scale occur when increasing the level of production leads to lower per-unit costs. This happens due to factors like bulk purchasing, better utilization of fixed costs, and operational efficiencies.
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: