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Which statement is correct...

Which statement is correct

A

Most common oxidation state of lanthanoid is `+2`

B

HCl can be used to acidify `KMnO_(4)` during redox reaction

C

In presence of `CO_(2)`, orange dichromate solution changes to yellow chromate

D

To separate `Fe_(2)O_(3)` and `Al_(2)O_(3)`, NaOH can used

Text Solution

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The correct Answer is:
D
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ALLEN-CHEMISTRY AT A GLANCE-INORGANIC CHEMISTRY
  1. The yellow colour solution of Na(2)CrO(4) changes to orange red on pas...

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  2. What is incorrect about the reactions of KMnO(4) and oxilic acid

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  3. Which statement is correct

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  4. On addition of small amount of KMnO(4) to concentrated H(2)SO(4), a gr...

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  5. Cr(2)O(7)^(2-)overset(pH=x)rarrCrO(4)^(2-)overset(pH=y)rarrCr(2)O(7)^(...

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  6. Which is correct :-

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  7. KMnO(4) is a strong oxidising agent in acidic medium. To provide acidi...

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  8. The product of oxidation of I^(-) with MnO(4)^(-) in alkaline medium i...

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  9. Interstitial compounds are formed when small atoms are trapped inside ...

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  10. In which of the following metallurgy, self reduction is not possible

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  11. Which reaction (s) occurs during calcination (a) CaCO(3)toCaO+CO(2)...

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  12. Which of the following statement is incorrect. On the basis of followi...

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  13. During the extraction of Ag and using a KCN solution and Zn, cyanide i...

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  14. Match the column {:("Column"-I,,,,"Column"-II),((a)"Zone refining",,...

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  15. Match the column - Column-I Column-II {:((a)"Copper pyrites",,,,(P...

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  16. Which of the following is incorrectly matched :-

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  17. Sheelite (CaWO(4)) is an ore of tungsten which contain tungestate ion,...

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  18. Which of the following pair is incorrectly matched

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  19. Which of the following metals cannot be extracted by carbon reduction ...

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  20. (i) underset(("A morphous solid"))(A)underset(air)overset(O(2))(to)Bov...

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