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    The d-And-f-Block Elements

    Multiple Choice QuestionsShort Answer Type

    131. In what way is the electronic configuration of the transition elements different from that of the non-transition elements?
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    132. What is the reason for the high melting points of d-block elements?
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    133. Explain giving reason:
    Transition metals and many of their compounds show paramagnetic behaviour.
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    134. Explain giving reason:
    The enthalpies of atomisation of the transition metals are high.
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    135. Explain giving reason:
    The transition metals generally form coloured compounds.

    Transition elelmet exhibit colour due to d-d transition. d-d transition is possible only when d- subshell have unpaired electron.
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    136. Explain giving reason:
    Transition metals and their many compounds act as good catalyst.
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    Multiple Choice QuestionsLong Answer Type

    137.

    What are interstitial compounds? Why are such compounds well known for transition metals?

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    138. How is the variability in oxidation states of transition metals different from that of the non-transition metals? Illustrate with examples.
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    139.

    Describe the preparation of potassium dichromate from iron chromite ore. What is the effect of increasing pH on a solution of potassium dichromate?

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    Multiple Choice QuestionsShort Answer Type

    140.

    Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with:
    (a) iodide    (b) iron (II) solution and     (c) H2S.

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