On pouring a clear solution of BiCl3 in dilute HCl into a large volume of water, a white turbidity appears. It is due to

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On pouring a clear solution of $BiCl X_{3}$ in dilute $HCl$ into a large volume of water, a white turbidity appears. It is due to

Bi X^{3 +}

salts hydrolyse on dilution:

BiCl X_{3} + H X_{2} O BiOCl + 2 HCl

. The white solid is bismuth oxychloride.