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Which of the following is amphoteric oxi...

Which of the following is amphoteric oxide?
`Mn_(2)O_(7), CrO_(3), Cr_(2)O_(3), CrO, V_(2)O_(5), V_(2)O_(4)`

A

`V_2O_5,Cr_2O_3`

B

`Mn_2O_7,CrO_3`

C

`CrO,V_2O_5`

D

`V_2O_5,V_2O_4`

Text Solution

Verified by Experts

The correct Answer is:
A
Oxides in the lower oxidation state are basic `(i.e. CrO, V_2,O_2)`, those in higher oxidation state `(e.g. Mn_2O_7, CrO_3)` are acidic and in the intermediate state `(e.g., Cr_2,O_3, V_2O_5)` are amphotertic.
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ICSE-d- AND- f- BLOCK ELEMENTS-EXERCISE (PART-I)(OBJECTIVE QUESTIONS)(THE CORRECT ALTERNATIVE FROM THE CHOICES GIVEN : )
  1. The electronic configuration of Cu(II) is 3d^9 whereas that of Cu(I) i...

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  2. Metallic radii of some transition elements are given below. Which of t...

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  3. Generally transition elements form coloured salts due to the presence ...

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

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  5. The magnetic nature of elements depends on the presence of unpaired el...

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  6. Which of the listed oxidation states is common for all lanthanoids ?

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  7. Which of the following reactions are disproportionation reactions ? ...

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  8. When KMnO4 solution is added to oxalic acid solution, the decolourisat...

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  9. There are 14 elements in actinoid series. Which of the following eleme...

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  10. KMnO(4) acts as an oxidising agent in acidic medium. The number of mol...

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  11. Which of the following is amphoteric oxide? Mn(2)O(7), CrO(3), C...

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  12. Gadolinium belongs to 4f series. It's atomic number is 64. Which of th...

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

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  14. The magnetic moment is associated with its spin angular momentum and o...

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  15. KMnO(4) acts as an oxidising agent in alkaline medium. When alkaline K...

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  16. Which of the following statements is not correct ?

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  17. When acidified K2Cr2O7 solution is added to Sn^(2+) salts, then Sn^(2+...

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  18. Highest oxidation state of manganese in fluorides is +4(MnF4) but hig...

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  19. Although Zirconium belongs to 4d transition series and Hafnium to 5d t...

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  20. Why is HCl not used to make the medium acidic in oxidation reactions o...

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