Which of the following are found as sulphide ores?
A
Al,Hg,Pb,F
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B
Fe,Zn,Pb
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C
Hg,Pb,Na
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D
F,Ca,Cu,Mg
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Solution
The correct option is CFe,Zn,Pb 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.