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12th Standard English Medium Chemistry Subject Book Back 5 Mark Questions with Solution Part - I

12th Standard

    Reg.No. :
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Chemistry

Time : 01:00:00 Hrs
Total Marks : 75

    Part I

    15 x 5 = 75
  1. Explain the principle of electrolytic refining with an example.

  2. Write a note on zeolites.

  3. Give two equations to illustrate the chemical behaviour of phosphine.

  4. Which is stronger reducing agent Cr2+ or Fe2+?

  5. What is crystal field stabilization energy (CFSE)?

  6. If NaCl is doped with 10-2 mol percentage of strontium chloride, what is the concentration of  cation vacancy?

  7. The time for half change in a first order decomposition of a substance A is 60 seconds. Calculate the rate constant. How much of A will be left after 180 seconds?

  8. A saturated solution, prepared by dissolving CaF2(s) in water, has \([Ca^{2+}]=3.3\times10^{-4}M\). What is the Ksp of CaF2?

  9. Calculate the standard emf of the cell: Cd|Cd2+||Cu2+|Cu and determine the cell reaction. The standard reduction potentials of Cu2+|Cu and Cd2+|Cd are 0.34V and -0.40 volts respectively. Predict the feasibility of the cell reaction.

  10. Give three uses of emulsions.

  11. What will be the product (X and A) for the following reaction acetylchloride \(\frac{\text { i) } \mathrm{CH}_{3} \mathrm{MgBr}}{\text { ii) } \mathrm{H}_{3} \mathrm{O}^{+}}{\longrightarrow} \mathrm{X} \stackrel{\text { acid } \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}}{\longrightarrow}\) 

  12. Write the structure of the major product of the aldol condensation of benzaldehyde with acetone.

  13. Identify A to E in the following sequence of reactions
       
     \(\overset { {CH_3} {CL} }{ \underset { {AlCl}_3 }{ \longrightarrow } }\) A \(\overset { {HNO_3}/ {H_2So_4} }{ \underset { {} }{ \longrightarrow } }\)  B \(\overset { {Sn} /{HCL} }{ \underset {{} }{ \longrightarrow } }\)  (C) \(\overset { {NaNo_2}/ {HCL} }{ \underset { {O^o}C }{ \longrightarrow } }\)  D \(\overset { {CuCN} }{ \underset { {}}{ \longrightarrow } }\) E

  14. What are different types of RNA which are found in cell

  15. Write a note on co –polymer

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