Answer:
A suspension of \[BaS{{O}_{4}}\] in
water (known as barium meal) is generally given to the patients when the X-ray
photographs of alimentary canal are required. The salt coats the canal and
X-ray can be taken. Otherwise, it is quite transparent to X-ray. Since \[BaS{{O}_{4}}\]
is almost insoluble in water, it does not pass from digestive system into the
circulatory system and can be, therefore, safely used.
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