Question

name a substance which on heating leaves behind no residue ? give an equation .

Answer 1

the substance is camphor, for instance.it is a common sublime i.e. it changes its form directly into vapour from solid, without turning into liquid, when heated and vice versa
the equation is:
2 C₁₀H₁₆O + 27 O₂ → 20 CO₂ + 16 H₂O

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Answer 2

Ammonium nitrate leaves no residue on burning . 
NH₂NO₃ ----- N₂O + 2H₂O.
  i hope that this will help u........................^_^