Ball clay contains kaolinite, quartz, and trace magnesium.
It does not contain mica or flux, which are non-plastic elements and not part of its composition.
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: