The d-and f-Block Elements
Bihar Board · Class 12 · Chemistry
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Which of the following elements belongs to the d-block of the periodic table?
The electronic configuration of Chromium (Cr, Z=24) is:
The highest oxidation state shown by manganese is:
Lanthanoid contraction refers to:
Sample Questions
Which of the following are characteristic properties of transition elements? (Select all correct answers)
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Formation of colored compounds, Variable oxidation states, Catalytic properties, Paramagnetism
Transition elements show colored compounds due to d-d transitions, variable oxidation states due to similar energies of ns and (n-1)d orbitals, catalytic properties due to multiple oxidation states, and paramagnetism due to unpaired electrons. They are not highly reactive with water like alkali metals.
Which of the following compounds are used as oxidizing agents? (Select all correct answers)
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K₂Cr₂O₇ (Potassium dichromate), KMnO₄ (Potassium permanganate)
K₂Cr₂O₇ and KMnO₄ are strong oxidizing agents because they contain metals (Cr and Mn) in high oxidation states (+6 and +7 respectively) that can be easily reduced. FeSO₄ and CuSO₄ are not typically used as oxidizing agents.
The magnetic moment of an ion with 3 unpaired electrons is approximately:
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3.87 BM
The magnetic moment is calculated using the spin-only formula: μ = √[n(n+2)] BM, where n is the number of unpaired electrons. For n=3: μ = √[3(3+2)] = √15 = 3.87 BM.
Which series of elements constitutes the f-block?
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Lanthanoids and actinoids
The f-block consists of lanthanoids (4f series, Ce to Lu) and actinoids (5f series, Th to Lr). These elements have partially filled f-orbitals and are also called inner transition elements.
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