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MCQEasyJEE Main 2026 · 28 January, Shift 2Oxidation Number & Redox Reactions

Chemistry Question from JEE Main 2026 · 28 January, Shift 2

Consider the following reactions:

Reaction scheme showing Na2B4O7 on heating giving 2X and Y; CuSO4 plus Y in non-luminous flame giving Z and SO3; and 2Z plus 2X plus carbon in luminous flame giving 2Q, Na2B4O7, and CO.

The oxidation states of Cu in Z and Q, respectively are:

  • A

    +2+2 and +1+1

  • B

    +1+1 and +2+2

  • C

    +2+2 and +2+2

  • D

    +1+1 and +1+1

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