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d and f Block Elements

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The alloy used in the construction of aircrafts is :
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Consider the hydrated ions of $\mathrm{Ti}^{2+}, \mathrm{V}^{2+}, \mathrm{Ti}^{3+}$, and $\mathrm{Sc}^{3+}$. The correct order of their spin-only magnetic moments is i.
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The pair that has similar atomic radii is :
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Which of the following is a condensation polymer?
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The transition element that has lowest enthalpy of atomisation, is
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The transition element that has lowest enthalpy of atomisation, is
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The correct order of atomic radii is
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Q JEE MAIN 2020
The correct electronic configuration and spinonly magnetic moment (BM) of $\mathrm{Gd}^{3+}(\mathrm{Z}=64)$, respectively, are
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Q JEE MAIN 2020
The lanthanoid that does NOT show +4 oxidation state is
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