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Formation of gas: uarr :: Formation of p...

Formation of gas: `uarr` :: Formation of precipitate:

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`darr`
In a chemical equation, formation of gas is indicated by an upward arrow `(uarr)`.Similarly formation os solid (precipitate) is indicated by a downward arrow `(darr)` .
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Knowledge Check

  • Descriptions of some reactions are given below. Arrange them in the order of chemical displacement, decomposition, double displacement and chemical combination. (A) Formation of precipitate (B) Liberation of H2 gas when metal reacts with acid. (C) Formation of ammonia from nitrogen and hydrogen. (D) Liberation of oxygen by heating of potassium nitrate.

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    A
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