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    The d-And-f-Block Elements

    Multiple Choice QuestionsShort Answer Type

    91.

    Name a member of the lanthanoid series which is well known to exhibit +4 oxidation state. 

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    92. What is the general electronic configuration of inner transition elements?
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    93. What is the common symbol used for lanthanoids.
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    94.

    Give the general electronic configurations of lanthanoids and actinoids.

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    95. Why are the 4f and 5f inner transition metals called lanthanoids and actinoids, respectively?
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    96. Which lanthanoid has maximum paramagnetism?

    Neodium[Nd] with atomic no. 60 has highest paramagnetic chracter. it's electronic configuration is 4f4 5d0 6s2. so it have 4 unpaired electron Neodymium (Nd) has maximum paramagnetism.
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    97. Which is the most common oxidation state of lanthanoids?
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    98. What is so special about Pr, Nd, Tb and Dy lanthanoids?
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    99. Why does the hardness of lanthanoids increase along the series?
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    100. Which is the hardest lanthanoid? Give reason.
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