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Doctors Medicines MCQs Q&A

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

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

Concept:

ACID:

  • It is an ion or a molecule that is capable of donating a hydrogen ion i.e. proton.
  • It has a sour taste.
  • It is corrosive in nature.
  • it changes the colour of litmus, from blue to red.
  • Its name come from the Latin word "acidus". which means  "sour" and refers to the sour taste of many acids. 
  • Its ph value range is between 1 to 7.
  • example: HCL, H2SO4 etc

BASE:

  • ​The base gives off hydroxyl ion when dissolved in water.
  • it changes red litmus paper to blue
  • It has a bitter taste
  • Its pH value range is between 7 to 14.
  • Example: NaOH, KOH etc.

Indicator:

  • It is something that gives information or shows a sign.
  • Examples of Indicators of acid and base are:
    • Litmus paper
    • Methyl orange
    • Phenolphthalein.
  Red Litmus Blue Litmus
Acidic solution Stays red Turns red
Neutral solution Stays red Stays blue
Alkaline solution Turns blue Stays blue

 

Indicator Acidic Neutral Alkaline
Methyl orange Red Neutral Yellow
Phenolphthalein Colourless Colourless Pink

Explanation:

  • Sometimes indicator's colour cannot be changed for both acid and bases
  • If an indicator gives a colour change for an acid then it can give a colour change for the base as well.
  • The colour change depends on the type of indicator as some indicators show different colours.
  • Hence option D is the correct answer.

Additional Information

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