Give two chemical equations in which evolution of gas takes place
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One of the most common gas evolution reactions is an acid-base reaction, where an acid is combined with a base to produce water and carbon dioxide. This is also commonly called a neutralization reaction, since the acid and base neutralize each other to make water.
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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. Change in Color – Some chemical reactions are accompanied by a change in color.
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