An unknown substance turns methyl orange solution red. what reaction does this substance exhibits? a)is a base b)is water c)is an acid d)is an alkaloid

I think the correct answer from the choices listed above is option C. The reaction of the unknown substance to the indicator methyl orange describes that the substance is an acid. For methyl orange, the solution color change from red to yellow. It is red at an acidic pH range.

From this reaction we can tell that this substance is C. Is an Acid. As the methyl orange changes to red in acidic solutions.