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Standard X
Chemistry
Polar Molecules
A mixture of ...
Question

A mixture of two white substances was dissolved in water. On passing Cl2 gas through the solution a deep brown colour is developed. The addition of BaCl2 solution to the original solution gives a white ppt. The addition of a large amount of NaOH solution to the original solution gives a white ppt, whose suspension in water is used as an antacid, the mixture gives a golden yellow colour flame.


What is the chemical composition of the mixture?

A
NaBr&MgSO4
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B
NaBr&CaSO4
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C
NaBr&Al2(SO4)3
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D
NaBr&ZnSO4
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Solution

The correct option is A NaBr&MgSO4
The chemical composition of the mixture is NaBr +MgSO4

On passing Cl2 gas through the solution a deep brown colour is developed. This indicates the replacement of bromine with chlorine.
2NaBr+Cl2→2NaCl+Br2

Barium chloride reacts with magnesium sulphate to form white ppt of barium sulphate.
BaCl2+MgSO4→MgCl2+BaSO4↓(white)

Addition of a large amount of NaOH solution to the original solution gives a white ppt of magnesium hydroxide , whose suspension in water is used as an antacid.
MgCl2+2NaOH→Mg(OH)2↓(white ppt)+2NaCl

The mixture gives golden yellow colour flame. This indicates presence of sodium.

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