Question

A chemical x is heated in a test tube. A brown coloured fume y comes out of it.

Answer 1

chemical is heated in a test tube brown fumes comes out and a black residue is left behind name the compound which gives brown fumes.

Answer 2

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a chemical is heated in a test tube browm fumes comes out and black residue is left behind (a)name the chemical which gives brown fumes (b)write ...