#### 12th Standard English Medium Chemistry Reduced Syllabus Creative Three mark Question with Answer key - 2021(Public Exam )

12th Standard

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Chemistry

Time : 02:00:00 Hrs
Total Marks : 75

Part A

25 x 3 = 75
1. Explain the electrometallurgy of aluminium

2. Before reduction, the ore is first convertedI into the oxide of metal of interest. Gtve reason

3. What is liquation?

4. Write a short note on hydroboration

5. Describe the structure of diamond.

6. Give the uses of sulphuric acid.

7. Explain the reaction of ammonia with chlorine and chlorides at different conditions

8. Why CIF 3 exists but FCl3 does not exist - Give reason.

9. Calculate the number of unpaired electrons in Ti3+ , Mn2+ and calculate the spin only magnetic moment.

10. Compare the ionization enthalpies of first series of the transition elements.

11. Explain why oxidation states of transition elements increases first from Sc to Mn and then decrease?

12. What are redox reactions?

13. Why Hcl and HNO3 cannot be used for making the KMnO4 medium acidic?

14. Give one test to differentiate [Co(NH3)5Cl]SO4 and [Co(NH3)5SO4]Cl.

15. ExplainBondingis metal carbonyls.

16. Why ionic crystals are hard and brittle?

17. Why are solids incompressible?

18. Diffraction angle 2θ equal to 14.8o for a crystal having interplanar distance in the crystal is 0.400 nm when second order diffraction was observed. Calculate the wavelength of X-ray used.

19. For a reaction x+y+z$\longrightarrow$ productsthe rate law is given by ratek =k[x]3/2[y]1/2 what is the overall order of the reaction and what is the order of the reaction with respect to z.

20. Give the characteristics of first order reaction.

21. Explain common ion effect with an example

22. Is it possible to store copper sulphate in an iron vessel for a long time?
Given : $E^{0}_{Cu^{2+}|Cu} = 0.34$ V and $E^{0}_{Fe^{2+}|Fe} = -0.44$V.

23. What do you mean by activity and selectivity of catalyst?

24. What is meta merism? Give the structure and IUPAC name of metamers of 2-methyoxy propane

25. What are reducing and non – reducing sugars?