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What are freons ? What are their harmful...

What are freons ? What are their harmful effects on the environment ?

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USHA PUBLICATION-PREVIOUS YEAR QUESTION 2020-PREVIOUS YEAR QUESTION
  1. The osmotic pressure ofa solution containing 50 g of a solute in one l...

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  2. What are bidentate ligands? Give an example.

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  3. What are freons ? What are their harmful effects on the environment ?

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  4. Answer any seven questions of the following: CuSO4 solution is elect...

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  5. What happens when KI solution is added to acidified K2Cr2O7 solution?

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  6. What are antioxidants ? Give two examples.

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  7. Under which condition the rate of reaction becomes equal to the specif...

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  8. Write the expressions for the rate of reaction of PC5rarrPCI3+ Cl2

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  9. How does Schottky defect arise ? In which type of ionic compounds does...

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  10. What happens when yellow phosphorus is heated with dilute NaOH solutio...

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  11. Explain what are ionic and covalent solids.Give one example of each.

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  12. What is the action of chlorine with (i) cold and dilute NaOH and (ii) ...

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  13. Discuss Reimer-Tiemann reaction.

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  14. Discuss the struchure of [Co(NH3)6]^(3+) ion on the basis of valence b...

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  15. Elucidate the differences between soaps and detergents.

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  16. Answer any seven questions of the following Discuss van Arkel Boer m...

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  17. The rate constants ofa reaction at 500 K and 700 K are 0.025 sec^-1 an...

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  18. Write a note on hydrogen-oxygen fuel cell.

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  19. What do you mean by biodegradale and non biodegradable polymers ? Give...

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  20. An organic compound having molecular formula C3H7Br on treatment with ...

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