Model paper

11th Standard

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 60

    Part-A

    Answer all the following questions

    10 x 1 = 10
  1. Which of the following statements about hydrogen is incorrect?

    (a)

    Hydrogen ion, H3O+ exists freely in solution.

    (b)

    Dihydrogen acts as a reducing agent.

    (c)

    Hydrogen has three isotopes of which tritium is the most common.

    (d)

    Hydrogen never acts. as cation in ionic salts

  2. Water gas is

    (a)

    H2O(g)

    (b)

    CO + H2O

    (c)

    CO + H2

    (d)

    CO + N2

  3. The hardness of water can be determined by volumetrically using the reagent

    (a)

    sodium thio sulphate

    (b)

    potassium permanganate

    (c)

    hydrogen peroxide

    (d)

    EDTA

  4. The cause of permanent hardness of water is due to

    (a)

    Ca(HCO3)2

    (b)

    Mg(HCO3)2

    (c)

    CaCl2

    (d)

    MgCO3

  5. Zeolite used to soften hardness of water is hydrated

    (a)

    Sodium aluminium silicate

    (b)

    Calcium aluminium silicate

    (c)

    Zinc aluminium borate

    (d)

    Lithium aluminium hydride

  6. In solid ice, oxygen atom is surrounded

    (a)

    tetrahedrally by 4 hydrogen atoms

    (b)

    octahedrally by 2 oxygen and 4 hydrogen atoms

    (c)

    tetrahedrally by 2 hydrogen and 2 oxygen atoms

    (d)

    octahedrally by 6 hydrogen atoms

  7. The type of H-bonding present in ortho nitro phenol and p-nitro phenol are respectively

    (a)

    inter molecular H-bonding and intra molecular H-bonding

    (b)

    intra molecular H-bonding and inter molecular H-bonding

    (c)

    intra molecular H - bonding and no H - bonding

    (d)

    intra molecular H - bonding and intra molecular H - bonding

  8. Heavy water is used as

    (a)

    moderator in nuclear reactions

    (b)

    coolant in nuclear reactions

    (c)

    both (a) and (b)

    (d)

    none of these

  9. Statement-I: Hydrogen is placed at the top of the group which is in-line with the latest periodic table.
    Statement-II: Hydrogen has a tendency to lose its electron to form H+, thus showing electropositive character like alkali metals. On the other hand, hydrogen has a tendency to gain an electron to yield H-, thus showing electronegative character like halogens.

    (a)

    Statements-I and II are correct and Statement-Il is the correct explanation of statement-I.

    (b)

    Statements-land II are correct but Statement-II is not the correct explanation of statement- I.

    (c)

    Statement-I is correct but Statement-II is wrong.

    (d)

    Statement-I is wrong but Statement-II is correct.

  10. Statement-I: The magnetic moment of parahydrogen is zero.
    Statement-II: The spins of two hydrogen atoms in para H2 molecule neutralise each other.

    (a)

    Statements-I and II are correct and Statement-II is the correct explanation of statement-I.

    (b)

    Statements-I and II are correct but Statement-II is not the correct explanation of statement- I.

    (c)

    Statement-I is correct but Statement-II is wrong.

    (d)

    Statement-I is wrong but Statement-II is correct.

  11. Part-B

    Answer all the following questions

    10 x 2 = 20
  12. Explain why hydrogen is not placed with the halogen in the periodic table.

  13. An the cube at 0° C is placed in some liquid water at 00C, the ice cube sinks - Why? What will happen to ice at 00C placed in liquid water at 00C? 

  14. Predict which of the following hydrides is a gas on a solid (a) BCI (b) NaH. Give your reason.

  15. Write chemical equation for the following reactions.
    (i) hydrogen with tungsten (VI) oxide.
    (ii) hydrogen gas and chlorine gas.

  16. NH3 has exceptionally high melting point and boiling point as compared to those of the hydrides of the remaining element of group 15. Explain.

  17. Why interstitial hydrides have a lower density than the parent metal.

  18. Explain what is meant by efflerescence.

  19. Write balanced chemical equation for each of the following chemical reactions.
    (i) Lithium metal with nitrogen gas
    (ii) heating solid sodium bicarbonate
    (iii) Rubidum with oxgen gas
    (iv) solid potassium hydroxide with CO2
    (v) heating calcium carbonate
    (vi) heating calcium with oxygen

  20. Substantiate lithium fluoride has the lowest solubility among group one metal fluorides.

  21. Mention the uses of plaster of paris

  22. Part-C

    Answer all the following questions

    10 x 3 = 30
  23. How do you convert parahydrogen into ortho hydrogen?

  24. How do you expect the metallic hydrides to be useful for hydrogen storage?

  25. Arrange NH3, H2O and HF in the order of increasing magnitude of hydrogen bonding and explain the basis for your arrangement.

  26. Do you think that heavy water can be used for drinking purposes?

  27. Compare the properties of ortho and para hydrogen.

  28. Compare the properties of isotopes of hydrogen.

  29. Draw the structure of the isotopes of hydrogen and distinguish them.

  30. Explain the different methods of preparation of Tritium with equation.

  31. What happens when hydrogen reacts with (I)  O2 (ii) Cl2 (iii) Na?

  32. Predict which of the following hydrides is a gas on a solid (a) HCI (b) NaH. Give your reason.

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