Question

Select the incorrect option. Indicator Colour in acidic medium Colour in basic medium

A. Litmus (Purple) Red Blue
B. Phenolphthalein (Colourless) Pink Colourless
C. Red cabbage extract (Purple) Red Green
D. Methyl orange (Orange) Red​

Answer 1

Answer:

Answer is (d)

Explanation:

Because mithyal orange is a acidic acid and it reacts with red one so it will be (d)

Answer 2

Option (c) is the incorrect option  Red cabbage extract (Purple) Red Green this is not a proper indicator that is used for the titration.

Explanation:

• In acid base titration indicators are used to determine the end point.
• Methyl orange is used as the indicator and it is called m-value.
• This indicator works at pH >4.3
• Methyl orange has the ability to change the colour alkaline and neutral water yellow.
• Methyl red is similar to methyl orange.
• Methyl orange is a weak base.
• It is used in strong acid and weak base titration.
• Colour changes depend on the pH of the solution.
• In acidic medium ph will be less than 3 and it shows red colour.