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Sugar, on being treated with `H_2SO_4`, forms a black residue. If we observe the weights of sugar and the residue, we find a difference m weights. Why

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Sugar, on being treated with `H_2SO_4`, forms a black residue. If we observe the weights of sugar and the residue, we find a difference m weights. Why?
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(i) Sugar undergoes chemical change.
(ii) Dlack carbon residue is formed.
(iii) Sugar is a combination of carbon, hydrogen and oxygen.
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