Question

Why is blood said to be mixture and graphite is an element?Mention any one reason for each

Answer 1

Blood is said to be a mixture because it is made up of more than two elements. Also , its composition is not uniform. While graphite is an element because it cannot split into its constituent particles.
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Answer 2

Blood is a mixture (colloid) because it contains Plasma, RBC, WBC, etc. Graphite is an element because it contains only atoms of carbon.