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12th Standard English Medium Chemistry Subject Book Back 3 Mark Questions with Solution Part - I

12th Standard

    Reg.No. :
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Chemistry

Time : 01:00:00 Hrs
Total Marks : 45

    Part I

    15 x 3 = 45
  1. Explain the electrometallurgy of aluminium.

  2. Describe the structure of diborane.

  3. Give a reason to support that sulphuric acid is a dehydrating agent.

  4. Explain the variation in E0M3+/M2+  3d series.

  5. Classify the following ligands based on the number of donor atoms.
    a) NH3
    b) en
    c) ox2-
    d) pyridine

  6. Calculate the percentage efficiency of packing in case of body centered cubic crystal.

  7. Identify the order for the following reactions
    (i) Rusting of Iron
    (ii) Radioactive disintegration of 92U238
    (iii) 2A+3B⟶ products ;rate = k[A]1/2[B]2

  8. Calculate the pH of 1.5\(\times\)10-3 M solution of Ba(OH)2

  9. Why is AC current used instead of DC in measuring the electrolytic conductance?

  10. What is the difference between a sol and a gel?

  11. Write Kolbe’s reaction.

  12. How will you convert benzaldehyde into the following compounds?
    (i) benzophenone
    (ii) benzoic acid
    (iii) α-hydroxyphenylaceticacid.

  13. Identify A,B,and C
    CH3- NO2 \(\overset { { L }_{ 1 }{AlH }_{ 4 } }{ \underset { {} }{ \longrightarrow } }\) A  \(\overset { { 2CH_3 }{Ch_2Br } }{ \underset { {} }{ \longrightarrow } }\) B \(\overset { {H}_{ 2 }{SO}_{ 4 } }{ \underset { {} }{ \longrightarrow } } \) C

  14. What are reducing and non – reducing sugars?

  15. Which sweetening agent are used to prepare sweets for a diabetic patient?

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