Chemistry – Important Question Bank for Gujarat Board HSC 2016 Examination

1. The +3 state of Cr is stable where as the +4 & +5 state of Cr are not stable
2. Cr2O3 is paramagnetic, where as CrO3 is diamagnetic.
3. Explain the re-activity of nitrogen
4. State the inert gas elements do not form convalent and ionic compounds.
5. Give information about the interstitial and Non-stoichiometric compounds of transition elements.
6. Explain the geometry and magnetic properties of four and six co-ordinated complexes giving illustrations.
7. Write the primary and secondary valencies of k3[Fe(OX)3]
8. The value of magnetic moment of a compound of manganese is 4.90 BM than state the oxidation state & the electron configuration of Mn.
9. The hybridization in complex K3[Fe(CN)6] is d 2sp3 and not sp3d2. Explain.
10. Write a note on the allotropes of arsenic and antimony.
11. Give electronic configuration of transition elements.
12. Explain giving reasons :

(a) CuCl2 is paramagnetic while CuCl is diamagnetic

(b) Ti+4 is more stable than Ti+3 but Ti+4 ion does not exist.

13. ZnSO4 is colourless while NiSO4 is coloured.

14. Explain the geometry of ML6 complexes giving examples.

15. Explain importance of complexes.

16. Discuss the various oxidation states observed in transition elements with suitable examples.

17. How many maximum covalent bonds can P, As and Sb form ?

18. Write a note on nitrogen based fertilizer

19. Discuss the acetylation & alkylation of aniline.

20. How does hemoglobin supply oxygen to tissues ?

21. Give preparation of Urea.

22. Give the sources of He(g).

23. Give electronic configuration of Cu29 & Cr24

24. What does secondary valency indicate ?

25. Which orbitals will be utilized for the hybridization of complex  [Fe(H2O)6]3+ ? Why ?

26.  Explain : Confirmative test of primary aromatic amines based on azo coupling.

27. What are vitamins ? Give sources and uses of vitamin C.

28. Explain in detail about the role of Chloroform in human life. Disucuss Grignard reaction of aldehyde and ketones.

29.  Write chemical equations for  conversions. Also give the conditions of the reactions, names and structural formula of the main organic compounds. (There should be only two steps of each conversion)

i) ) Benzyl chloride from benzoic acid

11) Ethyl benzoate from toluene

iii) Propane from Iso-propyl alcohol

iv) Ethyl iodide from acetaldehyde.

30. On the basis of which principle can Nernst’s equations be derived ? (2) State (n + l) rule.

31. Why does a gaseous fuel burn much faster than a solid fuel ?

32. Compound A on heating with sodalime produced B, which on treatment with a mixture of conc. HNO3 and conc. H2SO4 produced  compound C. On reduction with Ni catalyst at 6000 C compound C produced compound D. Give reaction scheme and identify the compound A, B, C & D from the chemical reactions.

33. Write a note on polyhalogen compounds

34. Give balanced equations of the following chemical reactions :

(a) The equation when potassium carbonate is reacted with nitric acid.

(b) Give the equation when potassium chlorate is treated with iodine

(c) The reaction when potassium hydroxide is reacted with nitricacid.

35. Sketch a cell in which the following reaction occurs  Zn(S)  + 2Ag+(aq) = Zn2+(aq) + 2Ag(S)  Label different parts of the cell, write equations for oxidation and reduction reactions and indicate electrodes on which they occur.

36. What is meant by order of reaction ? Explain in detail on the basis of the following general equation  n1A + n2B = n3C + n4D

37. Distinguish between covalent bond and coordinate covalent bond.

38. Write a note on gas electrodes

39. On exposure to air, yellow phosphorus ignites spontaneously. Why ?

40. Give the molecular formula of :

(a) nitrogen sesequioxide

(b) Sodium meta arsenide

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