As said that in a chemical reaction original material cannot be recovered then is:
N2+3H2 giving 2NH3+heat
areversible change.

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Solution

A chemical reactions involves formation of new products from the original reactants. Thus, one new products are formed original reactants cannot be obtained. But there are some chemical reactions which are reversible.In these reactions the forward reaction (in which the new products are formed ) and the backward reaction ( in which the original reactants are formed) ocuur simultaneously.
Therefore, N₂+ 3H₂ â†’ 2NH₃+ heat is a reversible change.

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As said that in a chemical reaction original material cannot be recovered then is:N2+3H2 giving 2NH3+heatareversible change.

As said that in a chemical reaction original material cannot be recovered then is:
N2+3H2 giving 2NH3+heat
areversible change.