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Introduction to d and f Block Elements

Which of the ...

Question

Which of the following is not a heavy metal?

C u

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H g

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P b

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K

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Solution

The correct option is B $K$
A heavy metal is any relatively dense metal. Density criteria range from above $3.5 g / c m^{3}$ to above $7 g / c m^{3}$ . Atomic numbers of heavy metals are generally greater than 20. $C u, H g$ and $P b$ are heavy metals but $K$ is not a heavy metal. So answer is D.

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Z n (s) + C u {({N O}_{3})}_{2} (a q) \to C u (s) + Z n {({N O}_{3})}_{2} (a q)

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