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Occurrence of Metals

Which of the ...

Question

Which of the following are found as sulphide ores?

A l, H g, P b, F

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F e, Z n, P b

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H g, P b, N a

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F, C a, C u, M g

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Solution

The correct option is C $F e, Z n, P b$
The metals in the middle of the activity series (Zn, Fe, Pb, etc.) are moderately reactive. They are found in the earth’s crust mainly as oxides, sulphides or carbonates. Hence, option $B$ is correct.

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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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3 F e (s) + 2 A l {({N O}_{3})}_{3} (a q) \to 2 A l (s) + 3 F e {({N O}_{3})}_{2} (a q)

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