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Reported Question / Answer
Q.) Copper is dissolved from its ore by H2SO4 in a percolation tank made of
1)
stainless steel
2)
wood
3)
high silicon iron (14% Si)
4)
reinforced concrete lined with lead
5)
NULL
Answer :
4
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Message / Correct Answer / Suggestion
Human Verification : Answer 2 + 3 = ?
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