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Name a member of the lanthanoid series w...

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

A

Ce

B

La

C

Lu

D

Pr

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The correct Answer is:
a
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(i) Name the element of 3d transition series which shows maximum number of oxidation states. Why does it show so ? (ii)Which transition metal of 3d series ha positive E^(@)(M^(2+)//M) value and why ? (iii) Out of Cr^(3+) and Mn^(3+) , which is a stronger oxidizing agent and why ? (iv) Name a member of the lanthanoid series which is well known to exhibit + 2 oxidation state. (v) Complete the following equation : MnO_(4)^(-) + 8H^(+) + 5e^(-) to .

Name a member of the lanthanoid series which is well known to exhibit +2 oxidation state.

(i)with reference to structural variability and chemical reactivity write the differences between lanthanoids and actinoids (ii) Mame a member of the lanthanoid series which is well known to exhibit +4 oxidation state (iii) Complete the following equation : MnO_(4)^(-)+8H^(+)+5e^(-)rarr (iv) out of Mn^(3+) and Cr^(3+) which is ore paramagnetic and why? Atomic nos : Mn =25 Cr =24

Name the following: (a) A transition metal which does not exhibit variation in oxidation state in its compounds. (b) A compound where the transition metal is the +7 oxidation state. (c) A member of the lanthanoid series which is well known to exhibit +4 oxidation state. (d) Ore used in the preparation of Potassium dichromate.

(i) Which transition element in 3d series has positive E_(M^(2+//)M)^(@) value and why ? (ii) Name a member of lanthanoid series which is well known to exhibit to exhibit +4 oxidation state and why? (b) Account for the following : (i) The highest oxidation state is exhibited in oxoanions of transition metals. (ii) HCl is not used to acidify KMnO_(4) solution. (iii) Transition metals have high enthalpy of atomisation.

Lanthanoids and actinoids are f-block elements in which the last electron enters the anti-penultimate energy level. The most common oxidation state of lanthanoids is +3, though +2 and +4 oxidation states are exhibited by some of the elements. In lanthanoid series, there is a progressive decrease in atomic and ionic radii, known as lanthanoid contraction. Unlike lanthanoids, actinoids show a large number of oxidation states. Name an element of lanthanoid series, which is known to show +4 oxidation state. Is it a strong oxidising agent or reducing agent?

Name the member of the lanthanoids series which exibit+4 oxidation states and those which exhibit+2 oxidation state. Try to correlate this types of behaviour with the electronic configuration of these elements.

PRADEEP-D- AND F-BLOCK ELEMENTS-TEST YOUR GRIP( MULTIPLE CHOCE QUESTIONS)
  1. Irregular trend in the standard reduction potential value of first row...

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  2. Which element does not show variable oxidation state ?

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  3. The maximum oxidation state of osmium is

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  4. Which of the following oxidation states is the most common among the l...

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  5. Which of the following cation is colourless in its aqueous solution

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  6. Which metal has highest density ?

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  7. Formation of interstitial compound makes the transition metal

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  8. Which of the following element about transition elements is incorrect ...

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  9. Permanent magnets are generally made of alloys of

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  10. Which of the following oxides of chromium is amphoteric in nature?

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  11. In the reaction : NaCl+ K(2)Cr(2)O(7) +cons. H(2)SO(4) overset("heat"...

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  12. In KMnO(2) on heating to red hot gives

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  13. KMnO(4) on heating to red hot gives

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  14. Which is the strongest base among the following ?

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  15. The electronic configuration of gadolinium (At. No 64) is:

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  16. Name a member of the lanthanoid series which is well known to exhibit ...

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  17. Larger number of oxidation state are exhibited by the actinoids than t...

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  18. Which of the following factor may be regarded as the main cause of lan...

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  19. Which of the following pairs has the same size ?

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  20. The maximum oxidation state exhibited by actinide ions is

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