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Chemistry · 2025 · 3 marks
CBSE 2025 · Region 5 · Set 3 · Q28
(a) Name the vitamin which is responsible for coagulation of blood. 1 (b) What is meant by denaturation of protein? Give an example.
(a)
Name the vitamin which is responsible for coagulation of blood. $\displaystyle 1$
(b)
What is meant by denaturation of protein ? Give an example.
Marking-scheme solution
(a)
Vitamin K
(b)
The loss in biological activity of native protein when it is subjected to physical or
chemical change/Disruption in secondary and tertiary structures of protein when
subjected to physical or chemical change.
Example: coagulation of egg on boiling.
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CBSE Class 12 Chemistry past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.