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When a white powder (A) is strongly heat...

When a white powder (A) is strongly heated, it gives of a colourless, odourless gas (B) which turns lime water milky (C) and if the passage of this gas is continued the milkiness disappears and gives a solution (D). The solid residue (E) is yellow when hot, but turns white on cooling. Idnetify (A) to (E) with help of the equations.

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