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Doctors Medicines MCQs Q&A

Consider the following statements.  A. Turmeric turns red in the solution of vinegar. B. Turmeric has no change in colour in the soap solution. C. China rose solution will turn dark pink in orange Juice. D. China rose turns green in baking soda solution. Which among the following statements are correct.

Consider the following statements.  A. Turmeric turns red in the solution of vinegar. B. Turmeric has no change in colour in the soap solution. C. China rose solution will turn dark pink in orange Juice. D. China rose turns green in baking soda solution. Which among the following statements are correct. Correct Answer C, D

Concept:

Acid and Base

  • Acids are substances that are sour in tests and turns litmus paper red. 
  • Acids are found in sour fruits, vinegar, toilet cleaner, and in several other items. 
  • Bases are substances with a soapy feel and bitter taste. 
  • They turn litmus paper blue and are found in substances like washing soda, baking powder, neem, and several other items. 


Indicators of Acid and Base

  • Indicators signify the presence of acid and base in a given solution. 
  • Litmus paper is a natural indicator of acid and base.
  • It is available in form of blue or red litmus paper.
  • It is obtained from lichens. 
  • Other natural indicators of acid and bases are turmeric, china rose, etc. 
  • A solution of china rose or turmeric in water will act as an indicator. 
  • The indicators basically react with acid and base and change in colour signifies such reactions. 
  • The effect of these indicators on acid and base are as below.

 

Natural Indicator

Effect on Acid

Effect on Base

Litmus Paper

Red

Blue

Turmeric

No change (Remains Yellow)

Red

China Rose

Dark pink or Magenta

Green

 

Explanation:

  • Vinegar contains acetic acid (CH3COOH). Turmeric will have no effect on it as vinegar is acid. 
    • Therefore statement A is wrong. 
  • The turmeric will turn soap solution red as soap solution is basic. 
    • Therefore, statement B is wrong. 
  • Orange is a sour fruit so it contains acid. The china rose indicator will turn dark pink in the orange juice.
    • Therefore statement C is correct. 
  • China rose turns green in a baking soda solution as soap solution is base. 
    • Therefore, Statment D is correct. 


C and D are correct statements. 

Additional Information

  • Phenolphthalein turns in pink colour in basic solution and remains colourless in acidic solution. 
  • It is a synthetic indicator. 

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