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Read carefully the passage and select the correct answer out of given four options:Transition elements show variable oxidation states. This is due to their valence electrons which are found in two different orbitals i.e., ns and (n-1)d. Up to (+II) oxidation state ns electrons are involved, but in higher oxidation states, electrons of (n-1)d sun-shells are involved.The most common oxidation state shown by 1st row of transition elements is(a) (+II)(b) (+III)(c) (+IV)(d) All of these

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Answer (a) (+II)



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