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Question

Which impurity (as a salt) is associated with table salt obtained from sea-water?

A
NaHCO3
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B
MgCO3
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C
MgCl2
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D
NaI
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Solution

The correct option is D MgCl2
Sea water contains MgCl2 brine so salt made from sea water contains this as impurity.
sea salt:
Chloride (Cl) 55.03%
Sodium (Na+) 30.59%
Sulfate (SO247.68%
Magnesium (Mg2+)3.68%
Calcium (Ca2+)1.18%
Potassium (K+)1.11%
Bicarbonate (HCO3)0.41%
Bromide (Br)0.19%

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