Chemical reaction in which there is evolution of gas
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A replacement reaction where gaseous hydrogen chloride and flurine gas react to release diatomic chlorine gas.. because of flurine is more electronegative. ..2 Hci + f 2 = 2 Hf + CI 2 gaseous state. ...and one more ex.is oxygen evolution.
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Evolution of Gas – Some chemical reactions take place with the evolution of gas. For example, when zinc reacts with hydrochloric acid, hydrogen gas is evolved with formation of zinc chloride.
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