A) \[A{{g}^{+}}\]
B) \[N{{a}^{+}}\]
C) \[M{{g}^{++}}\]
D) \[C{{a}^{++}}\]
Correct Answer: D
Solution :
On heating or on treatment with mineral acids the colloidal proteins are precipitated. This change is irreversible and is known as coagulation. This is due to \[C{{a}^{2+}}\] ions.
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