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Important Questions of D and f block | Class 12 Chemistry
(1) Why do d-block elements show variable oxidation states?
Answer:
Because both (n–1)d and ns electrons participate in bonding.
The energy difference between these orbitals is very small, so different numbers of electrons can be lost.
Example:
Fe → +2, +3
Mn → +2 to +7
(2) Why are transition metals colored?
Answer:
Due to d–d electronic transitions.
In transition metals, partially filled d-orbitals absorb specific wavelengths of light. The remaining reflected light gives color.
Example:
Cu²⁺ → Blue
Fe³⁺ → Yellow/Brown
(3) Why do transition metals form complex compounds?
Answer:
Because they have:
Small size
High charge
Vacant d-orbitals
These allow them to accept lone pairs from ligands and form coordination compounds.
Example:
[Cu(NH₃)₄]²⁺
(4) Why do transition metals show catalytic properties?
Answer:
Due to:
Variable oxidation states
Ability to form intermediate complexes
Large surface area (in finely divided state)
Example:
Fe in Haber Process
V₂O₅ in Contact Process
(5) Why do lanthanoids show contraction?
Answer:
Because of poor shielding effect of 4f electrons.
As atomic number increases, effective nuclear charge increases, causing gradual decrease in atomic size.
This is called Lanthanoid Contractio.
3 months ago | [YT] | 31
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A C Generator Easy Model | Class 12 Physics Projects
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Guess Number of shapes present in this Structure !
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Preparation Of Bioplastic | Class 12 Chemistry Project
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Brown Ring Test - Confirmatory Test for Nitrate 👇
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Let's Talk to MANGO...
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🎉 1 MILLION VIEWS! 🎉
A huge THANK YOU to all our amazing viewers and learners! 🙏
Our short video — “Different Poles of Magnet Identified Using Iron Filings Arrangement” — has crossed 1 Million views! 🧲✨
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What began as a simple demonstration of magnetic field patterns around two bar magnets has now become a magnetic moment of joy for the entire ChemXpert family! 💫
Your love for science, curiosity, and support keeps us inspired to make learning fun, visual, and experimental. ❤️
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Keep experimenting with #ChemXpert ⚗️
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19. When stomata close, transpiration:
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7. What type of cells are guard cells?
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14. Which pigment is present in guard cells to absorb sunlight?
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