Which of the following observations is true about dilute solution of acetic acid?(a) It smells like vinegar and turns red litmus blue.(b) It smells like onion and turns blue litmus blue.(c) It smells like orange and turns red litmus blue.(d) It smells like vinegar and turns blue litmus red.

Correct answer: (d) It smells like vinegar and turns blue litmus red.

Explanation: Vinegar is actually a dilute solution of acetic acid, hence both have the same type of smell.  Being an acid, acetic acid turns blue litmus red due to its acidic nature.