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The d-And-f-Block Elements

Short Answer Type

121.

What is the effect of increasing pH in K₂Cr₂O₇, solution?

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122.

Within a periodic group of transition elements the possibility of exhibiting maximum oxidation state increases with atomic number. Why?

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123. Write down the electronic configuration of:
(i) Cr³⁺ (ii) Cu⁺ (iii) Co²⁺(iv) Mn²⁺ (v) Pm³⁺(vi) Ce⁴⁺ (vii) Lu²⁺ (viii) Th⁴⁺

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124. Why are Mn²⁺ compounds more stable than Fe²⁺ towards oxidation to their +3 state?

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Long Answer Type

125. Explain briefly how +2 state becomes more and more stable in the first half of the first row transition elements with increasing atomic number?

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126. To what extent do the electronic configurations decide the stability of oxidation states in the first series of the transition elements? Illustrate your answer with example.

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Short Answer Type

127. What may be the stable oxidation state of the transition element with the following d electron configurations in the ground state of their atoms: 3d³, 3d⁵, 3d⁸ and 3d⁴?

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128. Name the oxometal anions of the first series of the transition metals in which the metal exhibits the oxidation state equal to its group number.

Name of oxometal anion

Name of metal with oxidation state

Group no. to which metal belong

1. CrO₄^2–
(chromate ion)

2. MnO₄^–
(permanganate ion)
3.Vanadate

Cr in +6 state of oxidation
Mn in +7 state

oxidation state +5

6th group of periodic table
7th group

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Long Answer Type

129. What is lanthanoid contraction? What are the consequences of lanthanoid contraction?

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130. What are the characteristics of the transition elements and why are they called transition elements? Which of the d-block elements may not be regarded as the transition elements?

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