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Question

Metal nitrate (A) on heating decomposes, leaving a residue (B) which goes into the solution with dil. HCl. The solution of (B) gives white ppt. with ammonium carbonate solution. Ppt. C dissolves in dil. HCl and solution is treated with potassium chromate to yellow ppt. (D). Solution V with dil.H2SO4 also gives white ppt. (E) insoluble in dil. HCl and nitric acid. Precipitate (E) is part of white pigment lithopone.

What is (E)?

A
BaSO4
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B
MgSO4
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C
CaSO4
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D
Na2SO4
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Solution

The correct option is A BaSO4
The sequence of reactions is given below.
Ba(NO3)2heatBaOdil HCl−−−BaCl2Ammonium carbonate−−−−−−−−−−−−AB
BaCO3dil HCl−−−BaCl2Potassium chromate−−−−−−−−−−−BaCrO4dil H2SO4−−−−−BaSO4CDE

So, E is the Barium sulfate (BaSO4)

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