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CaptainDanger said:Dibasic contains two hydrogen atoms that can be replaced....
As you can see the empirical formula is CHO.... But in the (iv) part they say ONE mole of acid produces two moles of Hydrogen ions.... Now that empirical formula has only one... So you need to add them up... To make them two... It leads to CHOCHO=CHCOOH... And I guess you can... But only in this CASE...
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