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A green chromium compound (A) on fusio...

A green chromium compound
(A) on fusion with alkali gives a yellow

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`A : FeCr_(2) O_(4) " " B: Na_(2) Cr_(4) " " C : Na_(2) Cr_(2) O_(7)`
`4FeCr_(2) O_(4) + 8Na_(2) CO_(3) + 7O_(2) to 8Na CrO_(4) + 2Fe_(2) O_(3) + 8CO_(2)`
`(A) " " (B )`
`Na_(2) CrO_(4)+ H_(2) SO_(4) to Na_(2) Cr_(2) O_(7) + Na_(2) SO_(4) + H_(2) O`
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CBSE COMPLEMENTARY MATERIAL-The d- AND f-BLOCK ELEMENTS-SHORT ANSWER-II TYPE QUESTION
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  2. give reason for the following statement (a)separation of lanthanoid el...

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  3. (b) Transition metal exhibit higher enthalpies of atomization. Explain...

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  4. (c) Why do the transition metal have high enthalpy of hydration ?

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  5. (a) By using Hund’s rule derive the electronic configuration of Ce^(+3...

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  6. (b) Is lanthanum a f-block element ?

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  7. Account for the following : (a) Silver chloride dissolves in excess ...

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  8. Account for the following : (b) Cuprous chloride is diamagnetic whil...

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  9. Account for the following : In CrO(4)^(2-) ion , all the Cr-O bond...

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  10. The values in respect of electrodes of Cr, Mn and iron are : Cr^(+3...

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  11. Write any three properties of interstitial compounds.

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  12. Account for the following : (a) All Scandium salts are white.

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  13. Account for the following : (b) The Ist ionization energy of the 5d ...

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  14. Account for the following : (c) Ce^(+3) can be easily oxidized to Ce...

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  15. A green chromium compound (A) on fusion with alkali gives a yellow

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  16. A green chromium compound (B) which on acidification gives a orange c...

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  17. A green chromium compound (C). Identify A, B, C. Write equations for ...

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  18. When an oxide of Mn (A) is fused with KOH in the presence of an oxi...

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  19. When an oxide of Mn (B). Compound (B) disproportionate in neutral or...

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  20. When an oxide of Mn (C). Identify A, B, C.

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