Eu2+, Yb2+ are good reductants whereas Tb+4 is an oxidant. Why?
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Complete the following reaction equations: (i) Cr2O72 + Sn2+ + H+ → (ii) MnO4– + Fe2+ + H+ →
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Explain the following facts: Transition metals form coloured complexes.
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Give reasons: Ce4+ is used as an oxidising agent in volumetric analysis.
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Give reasons: Among transition metals, the highest oxidation state is exhibited in oxoanions of a metal.
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Why La, Gd and Lu has low value of 3rd ionisation enthalpies?
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Given below are the electrode potential values, E° for some of the first row of transition elements: Elements V(23) Cr(24) Mn(25)Fe(26)Co(27)Ni(28) Cu(29) E°M2+/M(V) –1.18 – 0.91 – 0.44 – 0.28 –0.28 –0.25 +0.34 Explain the irregularities in these values on the basis of electronic structures of atoms.
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Why is cerium a good analytical reagent?
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Give reasons: Zn2+ salts are white while Cu2+ salts are blue.