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a) How can you express in a chemical equ...

a) How can you express in a chemical equation if the gas involved in the reaction?

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1) If a gas is evolved in a reaction, it is denoted by an upward arrow `darr.`
Eg : `Zn_((s))+H_(2)SO_(4(aq))rarr ZnSO_(4(aq))+H_(2(g))uarr.`
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