Identify the correct formula of halides of alkaline earth metals from the following.
(i) BaCl2.2H2O
(ii) BaCl2.4H2O
(iii) CaCl2.6H2O
(iv) SrCl2.4H2O
Option (i) BaCl2.2H2O and (iii) CaCl2.6H2O are the answers.
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