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Which of the following oxides are amphot...

Which of the following oxides are amphoteric? `Mn_2O_7,CrO_3,Cr_O_3,V_2O_5`

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UNITED BOOK HOUSE-HIGHER SECONDARY EXAMINATION 2019-EXERCISE
  1. What is thermit mixture? Mentain one use of it.

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  2. Which of the following are coloured in aqueous solution? Give rea-sons...

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  3. Which of the following oxides are amphoteric? Mn2O7,CrO3,CrO3,V2O5

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  4. Explain why most of the Cu (1) compounds are unstable in aqueous solut...

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  5. What happens when MnO(4)^(2-) ion is kept in acid medium? Write bal-an...

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  6. Write R/S configuration of

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  7. Write structural formula of A for the following reaction:

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  8. Distinguish between propanone and pentan-3-one by a suitable chemi-cal...

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  9. Write the structural formula of A, B, C, D in the following reactions:

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  10. Write equation of the following conversion . Salicylic and aspirin.

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  11. Mention one use of Lucas reagent.

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  12. Convert aniline to fluorobenzene.

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  13. Write structural formula of the compounds A to D.

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  14. An organic compound A (C3H8O) on treatment with Cu dust at 573 K gives...

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  15. The followign compound is an example of peptide Write. Zwitterion s...

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  16. Write equation for the reaction of glucose with periodic acid.

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  17. Draw the graph of half-life period (t(1/2) versus initial concentratio...

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  18. The rate of a reaction at 200 K is 10 times less than the rate of the ...

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  19. The unit of rate constant of a chemical reaction is L^2mol^(-2)s^(-1)....

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  20. The rates of a first order reaction after 10 mins and 20 mins from the...

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