b tech 1 year engineering chemistry lab viva questions with answers pdf

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To determine the strength of unknown solution of ferrous ammonium sulphate by titrating it against standard solution of potassium dichromate using potassium ferrycynaide as an external indicator

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1. What are hard waters?

2. How are waters classified according to the degree of hardness?

3. How is water hardness produced?

4. How is temporary hardness eliminated?

5. How do you express the total hardness of water?

6. What is EDTA?

7. Write the structural formula for EDTA.

8. Why is disodium salt preferred from EDTA to EDTA?

9. Why is ammonia solution added while the EDTA solution is being prepared?

10. What is the buffer solution?

11. Why is ammonia-ammonium chloride buffer added?

12. Why does the Eriochrome Black (EBT) indicator show red wine at the beginning and blue at the end?

13. Why is the titration involving EDTA carried out slowly towards the end point?

14. What is the application of the date of hardness in the practice of environmental engineering? What are the components of cements?

16. What are the main components of cement?

17. Why is the role of glycerol and NaoH?

18. What is the function of diethyl amine?

19. Why can not the Eriochrome Black T indicator be used in this experiment?

20. What is the indicator used in the determination of CaO I cement solution?

21. What are the components of Brass?

22. How is the brass solution prepared?

23. What is the purpose of adding urea?

24. Why is ammonium hydroxide added to the brass solution?

25. What is the blue-white precipitate formed after adding ammonia solution?

26. Why is acetic acid added?

27. How is the liberated iodine calculated?

28. What is the reaction that occurs between iodine and sodium thiosulfate?

29. Why is the starch indicator added to the end point?

30. What is the white precipitate produced at the end of the point?