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Chromium (atomic-mass=52) metal has body...

Chromium (atomic-mass=52) metal has body-entred cubic structure. The radius of chromium atom is 124.3 pm. Calculate the density of chromium metal.

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UNITED BOOK HOUSE-HIGHER SECONDARY EXAMINATION 2019-EXERCISE
  1. Write the name of monomer units of Dacron and mention one use of it.

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  2. Which type of stoichimetric defects is shown by Ag Br crystal?

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  3. Chromium (atomic-mass=52) metal has body-entred cubic structure. The r...

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  4. What do you mean by packing fraction of cubic unit cell?

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  5. Calculate packing fraction of face-centred cubic unit cell.

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  6. What is the vapour pressure of purewater at 100^@C temperature?

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  7. 12 g of a solid solute is dissolved in 90 gm pure water. Vapour pressu...

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  8. Write cell reaction and calculate electrical work obtained from the fo...

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  9. Write composition of copper matte.

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  10. Write balanced equations for the reactions involved in the extraction ...

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  11. Which type of ores is concentrated by froth floatation process?

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  12. What is thermit mixture? Mentain one use of it.

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

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

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

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

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  17. Write R/S configuration of

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

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

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

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