Question

Curd taste sour because this is a/an:
(A). Base
(B). Salt
(C). Acid
(D). Liquid

Answer 1

- Hint: One of the main components of the curd is lactic acid which is produced by lactobacillus bacteria, a gram positive bacteria. Due to this, curd tastes sour in taste. Also, sour is called “accre” in Latin.

Complete step-by-step solution -
Curd is a dairy product which has pH of 4. The process of coagulation of milk is called curdling and the coagulating agent that is used is by adding rennet or any edible acidic substance like lemon juice or vinegar, which is further allowed to coagulate. The increased acidity causes the milk protein that is called casein gets converted into solid masses called curd. Sometimes, when milk is left for hours, it naturally produces curds without the addition of any external coagulating agent but that is not edible. Cheese production is also one of the processes of coagulation.
We also know that the substance whose pH is less than 7 is called an acidic substance. Some other examples of acids are:
Hydrochloric acid in gastric juice
Carbonic acid in soft drinks
Ascorbic acid in lemon and many fruits
Citric acid in oranges and lemons
Acetic acid in vinegar
Nitric acid used in laboratories
Sulfuric acid used in laboratories
Therefore, the correct option is (C) Acid.

Note: The most common characteristics of acids are-
It tastes sour.
They are corrosive to metals
It changes blue litmus to red
It becomes less acidic on mixing with bases.