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

A
Na+,Mg2+,Br and SO24
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B
Na+,Ca2+,Br and SO24
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C
Na+,Al3+,Br and SO24
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D
Na+,Zn2+,Br and SO24
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Solution

The correct option is A Na+,Mg2+,Br and SO24
A deep brown colour of bromine gas is obtained when chlorine is passed through the given solution of the mixture.
2Br+Cl2Br2(reddish brown)+2Cl
White precipitate of barium sulphate is formed after the addition of BaCl2.
SO24+BaCl2BaSO4(white ppt.)+2Cl
The white precipitate formed after the addition of NaOH will be Mg(OH)2 as it is used as an antacid.
Mg2++2NaOHMg(OH)2(white ppt.)+2Na+
Golden yellow color of the flame shows that the mixture has sodium salt.
Thus, the mixture contains Na+,Mg2+,Br and SO24.

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