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How do you prepare : (i) k(2)MnO(4) fr...

How do you prepare :
(i) `k_(2)MnO_(4) from MnO_(2)`?
(ii) `Na_(2)Cr_(2)O_(7) from NaCrO_(4)`?
(b) Account for the following :
(i) `Mn^(2+)` is more stable then `Fe^(2+)` towards oxidation to + 3 state.
(ii) The enthelpy of atomization is lowest for Zn in 3d series of the transition elements.
(iii) Actinoid elements show wide range of oxidation states.

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Explore conceptually related problems

How would you prepare (i) K_(2)MnO_(4) and MnO_(2) ? (ii) Na_(2)Cr_(2)O_(7) from Na_(2)CrO_(4) ?

(a) Account for the following : (i) Mn_(2)O_(7) is acidic whereas MnO is basic. (ii) Though copper has completely filled d-orbital (d^(10)) yet it is considered as a transition metal. (iii) Actinoids show wide range of oxidation states. (b) Write the preparation of potassium permanganate from pyrolusite ore (MnO_(2)) .

State the reason for the following : (i) Cu (I) ion is not stable in an aqueous solution. (ii) Unlike Cr^(3+),Mn^(2+),Fe^(3+) and the subsequent other M^(2+) ions of the 3d series, the 4d and 5d series metals generally do not form stable oxidation states.

Write the preparation of following : (i) KMnO_4 from K_2MnO_4 (ii) Na_2CrO_4 from FeCr_2O_4 (iii) Cr_2O_(7)^(2-) from Cr_2O_(4)^(2-)

In which of the following is there an element with the same oxidation state as that of chromium in K_(2)Cr_(2)O_(7) ?

Knowledge Check

  • In which of the following is there an element with the same oxidation state as that of chromium in K_(2)Cr_(2)O_(7) ?

    A
    `Cl_(2)O_(7)`
    B
    `[Fe(CN)_(6)]^(3-)`
    C
    `VO^(2+)`
    D
    `K_(2)MnO_(4)`
    • MODERN PUBLICATION-D AND F-BLOCK ELEMENTS-REVISION EXERCISES ( LONG ANSWER QUESTION)
    1. How do you prepare : (i) k(2)MnO(4) from MnO(2)? (ii) Na(2)Cr(2)O...

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    2. (i) Name the element of 3d transition series which shows maximum numbe...

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    3. (i) Why do lanthanoids have very similar chemical reactivity? (ii...

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    4. (i) Why do transition metals form a large number of alloys? (ii) ...

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    5. (a) What is Lanthanoid contraction? Give the cause of lanthanoid contr...

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    6. (a) Out of Cu^+ and V^(2+) which will be coloured and why? (Atomic ...

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    7. (a) Account for the following : (i) Transition metals form large num...

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    8. (a) (i) How is the variability in oxidation states of transition metal...

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    9. (i) Give the general electronic configuration of d-block elements, (ii...

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    10. (i) Which of the first row transition metal exhibit +7 oxidation state...

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    11. (a) Why are Mn^(2+) compounds more stable than Fe^(2+) towards oxid...

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    12. (a) Write ionic equations for the reaction of acidified potassium perm...

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    13. (a) Silver atom has completely filled 'd' orbitals (4d^10) in its gro...

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    14. (a) Members of second and third transition series exhibit similar atom...

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    15. (a) Give two differences between Lanthanoids and Actinoids. (b) How ma...

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    16. (a) Give preparation of potassium permanganate (KMnO4). (b) What is la...

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    17. (a) Give reasons for the following : (i) Mn^(3+) is a good oxidising...

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    18. (a) Why do transition elements show variable oxidation states? (i) N...

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    19. (a) Complete the following equation : (i) CrO(4)^(2-)+2OHrarr (ii...

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    20. (i)with reference to structural variability and chemical reactivity wr...

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