Question

Consider the following statements:(a) Both acids and bases change colour of all indicators.(b) If an indicator gives a colour change with an acid, it does not give achange with a base.(c) If an indicator changes colour with a base, it does not change colourwith an acid.(d) Change of colour in an acid and a base depends on the type of theindicator.Which of these statements are correct?(i) All four (ii) a and d (iii) b and c (iv) only d

Answer 1

Dear Student,

◆ Answer -

(iv) only d is correct.

Change of colour in an acid and a base depends on the type of theindicator.

● Indicators -

• Indicators are chemical compounds that change colour according to pH of the solution they are put in.
• They are used to determine pH of the body (acidity/basicity).

# Examples of indicators -

Natural indicators -

• China rose
• Red cabbage juice
• Rose petals
• Litmus paper

Artificial indicators -

• Universal indicator
• Phenol-phthalene
• Methyl orange
• Thymol blue

Thanks dear. Hope this helps you...