JEE Advanced 2021 Full Test 2 Paper 2

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SECTION – B (Single Digit Integer Type)
This section contains 06 questions. The answer to each question is a Single Digit integer ranging from 0 to 9, both inclusive.
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Question : 29 of 54
 
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A molten mixture contain following substance,
Cu,FeO,PbO,CaO,MgO,Ag
Find number of substances which are removed when molten mixture is treated with SiO2.
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