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Q.

Which one of the following is not a mixture

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a

Blood

b

Plutonium

c

Saliva

d

Steel

answer is D.

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Detailed Solution

Blood, steel (Fe+ Cr + Mn + C with other elements) and saliva (water + NaCl or KCl) are mixtures. But “Plutonium” is a chemical element with atomic number 𝑍 = 94 .So that it is a pure substance.

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