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Gadolinium has a low value of third ionisation enthalpy because of

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Important Questions on The d- and f-Block Elements

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In the neutral or faintly alkaline medium, KMnO4 oxidises iodide into iodate. The change in oxidation state of manganese in this reaction is from
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Zr(Z=40) and Hf(Z=72) have similar atomic and ionic radii because of:
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Match the following aspects with the respective metal.

  Aspects   Metal
(a) The metal which reveals a maximum number of oxidation states (p) Scandium
(b) The metal although placed in 3d block is considered not as a transition element (q) Copper
(c) The metal which does not exhibit variable oxidation states  (r) Manganese
(d) The metal which in +1 oxidation state in aqueous solution undergoes disproportionation (s) Zinc
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The manganate and permanganate ions are tetrahedral, due to:
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Match the metal ions given in Column 'I' with the spin magnetic moments of the ions given in Column 'II'.
Column I Column II
a. Co3+  i. 8 B.M.
b. Cr3+ ii. 35 B.M.
c. Fe3+ iii. 3 B.M.
d. Ni2+ iv. 24 B.M.
  v. 15B.M