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☞︎︎︎ 1. Which of following sets of substances contain acids ?
Answer → Curd nd Vinegar✔
➠Curd contains lactic acid and vinegar contains acetic acid. Lime water, soap, and milk of magnesia are basic substances and grapes contain tartaric acid.
☞︎︎︎ 2. Which of the following is an acid - base indicator ?
Answer → Turmeric ✔
➠The active ingredient present in turmeric is curcumin as an acid-base indicator that is yellow in acidic and neutral solutions and orange or reddish-brown in basic solutions.
Acid–base indicators are generally weak protolytes that change color in solution according to the pH.Examples of acid-base indicators include litmus paper, phenolphthalein, and red cabbage juice. An acid-base indicator is a weak acid or weak base that dissociates in water to yield the weak acid and its conjugate base or else the weak base and its conjugate acid.