Question

<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> Between phenolphthalein and methyl orange, which will not indicate acids?

Answer 1

<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> Methyl orange turns red in acidic solutions and yellow in basic solutions. [0.5 mark]
Phenolphthalein shows a colour change only in basic medium and no colour change in acidic or neutral solutions. [0.5 mark]
Hence, phenolphthalein would not be able to indicate acids. [1 mark]