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Which of the following oxides are amphot...

Which of the following oxides are amphoteric ?
`Mn_2O_7 , CrO_3 , Cr_2O_3 , V_2O_5`

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`Cr_(2)O_(3)` and `V_(2)O_(5)` are amphoteric oxides.
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CHHAYA PUBLICATION-PREVIOUS YEARS QUESTION PAPER 2019-WBCHSE 2019 PART-B
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  4. Which of the following is lyophilic colloid ?

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  5. Which of the following is strongest base ?

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  6. Which of the following transition elements show +7 oxidation state ?

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  7. In which of the following metal ions hybridisation state in sp^3d^2 /

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  8. Which of the following is most reactive in SN2 reaction ?

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  9. Which of the following cannot be identified by iodoform test ?

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  10. Which of the following compounds does not respond to aldol condensatio...

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  11. Which of the following bases is not present in RNA ?

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  12. Which of the following bases is not condesation polymer ?

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  13. Which of the following is antihistamine drug ?

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  14. Which of the following is paracetamol ?

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  15. Arrange Li^(+), Na^(+) , and Rb^(+) ions in the ascending order of the...

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  16. What is the unit of electro-chemical equivalent ?

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  17. By which property of colloid, we can distinguish between colloidal sol...

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  18. Why is magnetic moment of ferric compounds more than ferrous compounds...

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  19. Write general electronic configuration of actinoids ?

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  20. Why is BHA added in butter ?

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