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12th Standard English Medium Chemistry Reduced Syllabus Two mark Important Questions with Answer key - 2021(Public Exam )

12th Standard

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Chemistry

Time : 02:00:00 Hrs
Total Marks : 100

    Part A

    50 x 2 = 100
  1. What is the role of Limestone in the extraction of Iron from its oxide Fe2O3?

  2. Name some elements that occur as native elements.

  3. What is Ellingham diagram? or
    What does Ellingham diagram represent?

  4. What is calcination? Give example.

  5. What is catenation ? describe briefly the catenation property of carbon

  6. What is burnt alum?

  7. Name the two important ores of Boron.

  8. Give the uses of helium.

  9. How is ammonia prepared in the lab?

  10. Account for the following:
    (i) O-O bond lengths in ozone molecule are identical.
    (ii) Most of the reactions in fluorine are exothermic.

  11. Justify the position of lanthanides and actinides in the periodic table.

  12. Write ionic equation for the reaction between Cr2O7-2 iODS and Fe2+ ions in acidic medium.

  13. Why Zn2+ salts are white while Ni2+ salts are coloured?

  14. What are the conditions for alloy formation?

  15. Write the formula for the following coordination compounds.
    a) potassiumhexacyanidoferrate(II)
    b) petacarbonyliron(0)
    c) pentaamminenitrito −k−N-cobalt(III)ion
    d) hexaamminecobalt(III)sulphate
    e) sodiumtetrafluoridodihydroxidochromate(III)

  16. Give an example of coordination compound used in medicine and two examples of biologically important coordination compounds

  17. Write the IUPAC name of the complex.

  18. Give reason for the following:
    Optical isomerism is not shown by square planar complexes.

  19. What are Co-ordination isomers? Give examples

  20. Cu SO4 on mixing with NH3 (1:4 ratio) does not give test for Cu2+ ions but gives test for SO42-ions why?

  21. Differentiate crystalline solids and amorphous solids.

  22. What is the total number of atoms per unit cell in a face - centered cubic structure (fcc)?

  23. Aluminium crystallises in a fee structure. Atomic radius of the metal is 125 pm. What is the length of the side of the unit cell of the metal?

  24. In CaF2 crystal, Ca2+ ions are present in arrangement. Calculate the number of F- ions in the unit cell.

  25. Derive integrated rate law for a zero order reaction A\(\longrightarrow \) product

  26. What is the study of chemical kinetics used for?

  27. The reaction A + 2B ⟶ C obeys the rate equation. Rate = \(K{ \left[ A \right] }^{ \frac { 1 }{ 2 } }{ \left[ B \right] }^{ \frac { 3 }{ 2 } }\) What is the order of the reaction?

  28. If the rate of a reaction gets doubled as the temperature is increased from 27oC to 37oC. Find the activation energy of reaction?

  29. Discuss the Lowery – Bronsted concept of acids and bases.

  30. Calculate the concentration of OH- in a fruit juice which contains \(2\times10^{-3}\) M, H3O+ ion. Identify the nature of the solution.

  31. What are the two types of buffer? Give an example for each.

  32. Why is aqueous solution of FeCl3 acidic?

  33. Why is anode in galvanic cell considered to be negative and cathode positive electrode?

  34. Define conductance. Give its unit

  35. Account for the following : For a strong electrolyte molar conductivity decreases as concentration increases

  36. Explain the function of a salt bridge in an electrochemical cell.

  37. What is the principle used in secondary batteries to regenerate the original reactants?

  38. Name the anode, cathode and electrolyte used in lithium - ion Battery

  39. Define electrochemical equivalent

  40. In case of chemisorption, why adsorption first increases and then decreases with temperature?

  41. Defme adsorption isotherm.

  42. What are main impurities in a colloidal solution?

  43. Gelatin acts as a protective colloid. Explain.

  44. What are promoters? Give an example.

  45. Draw the major product formed when 1-ethoxyprop-1-ene is heated with one equivalent of HI

  46. A Compound (A) with molecular formula C2H3N on acid hydrolysis gives(B) which reacts with thionylchloride to give compound(C). Benzene reacts with compound (C) in presence of anhydrous AlCl3 to give compound(D). Compound (D) on reduction with Zn/Hg and Conc.HCl gives (E).  Identify (A), (B), (C) (D) and (E). Write the equations.

  47. Derive the relation between f and R for a spherical mirror.

  48. What happens when
    i. 2 – Nitropropane boiled with HCl
    ii. Nitrobenezenelectrolytic reduction in strongly acidic medium.
    iii. Oxidation of tert – butylamine with KMnO4
    iv. Oxidation of acetoneoxime with trifluoroperoxy acetic acid.

  49. Name the Vitamins whose deficiency cause
    i) rickets
    ii) scurvy

  50. Name one substance which can act as both analgesic and antiphyretic

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