Consider the following Assertion (A) : Alum is applied to stop bleeding from cuts. Reason (R) : Blood is colloidal system containing negatively charged colloidal particles. The Aluminum ions of Alum have high coagulating power so that the blood gets coagulated Select the correct answer using from the code given below :

Asked in UPPSC Upper Mains 2010 · Topic: Physical and Chemical Changes, Solution (Properties of Colloids (Tyndall Effect, Brownian Motion))

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.

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