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The D-And-f-Block Elements
Question
Which is a stronger reducing agent Cr2+ or Fe2+ and why?
Solution
Cr2+ is strong reducing agent than Fe2+.
Reason: d4 → d5 occurs in case of Cr2+ to Cr3+.
But d6 → d5 occurs in case of Fe2+ to Fe3+. In a medium (like water) d3 is more stable as compared to d5.
Some More Questions From The d-And-f-Block Elements Chapter
Actinoid contraction is greater from element to element than lanthanoid contraction. Why?
On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?
The outer electronic configuration of copper is 3d10 4s1, yet it is considered transition element. Why?
Why the melting points of transition elements are high?
Why Zn, Cd and Hg are not regarded as transition elements?
Name the first element of 3rd transition series.
Though copper, silver and gold have completely filled sets of d-orbitals yet they are considered as transition metals. Why?
Why are transition elements so named?
Why are transition elements known as d-block elements?
Write the general electronic configuration of d-block elements.
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Mock Test Series
Mock Test Series