LPT-0168
QUESTION
The milk having an acidity of 0.72% will?
OPTIONS
(A) Curdle on boiling
(B) Coagulate spontaneously
(C) Coagulate followed by liquefaction
(D) Remain normal
ANSWER
(A) Curdle on boiling
EXPLANATION
Milk acidity of about 0.72% lactic acid is high enough to destabilize casein markedly, so heating causes coagulation and the milk curdles on boiling. Spontaneous coagulation generally occurs at still greater acidity, while such milk would not remain normal. Therefore, option (A) is correct.
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