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.
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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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Long Answer Type
