Alkali and Alkaline Earth Metals - Important Question Paper

11th Standard

    Reg.No. :
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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50

    Part A

    10 x 1 = 10
  1. Find the wrong statement

    (a)

    sodium metal is used in organic qualitative analysis

    (b)

    sodium carbonate is soluble in water and it is used in inorganic qualitative analysis

    (c)

    potassium carbonate can be prepared by solvay process

    (d)

    potassium bicarbonate is acidic salt

  2. Lithium shows diagonal relationship with

    (a)

    sodium

    (b)

    magnesium

    (c)

    calcium

    (d)

    aluminium

  3. In case of alkali metal halides, the ionic character increases in the order

    (a)

    MF < MCI < MBr < MI

    (b)

    MI < MBr < MCI < MF

    (c)

    MI < MBr<MF < MCI

    (d)

    none of these

  4. In which process, fused sodium hydroxide is electro lysed for extraction of sodium

    (a)

    Castner's process

    (b)

    Cyanide process

    (c)

    Down process

    (d)

    All of these

  5. Assertion Generally alkali and alkaline earth metals form superoxides
    Reason There is a single bond between O and 0 in superoxides

    (a)

    both assertion and reason are true and reason the correct explanation of assertion

    (b)

    both assertion and reason are true but reason is not the correct explanation of assertion

    (c)

    assertion is true but reason is false

    (d)

    both assertion and reason are false

  6. Choose the correct statement:

    (a)

    Alkali metals are highly electropositive because of their low ionisation energies

    (b)

    Alkali metal cations have stable electronic configuration

    (c)

    The hydration enthalpies of alkali metals decreases from Li+ to Cs+

    (d)

    all the above.

  7. Sodium react with water more vigorously than lithium because:

    (a)

    it has higher atomic mass

    (b)

    it is more electropositive

    (c)

    it is more electronegative

    (d)

    it is a metal.

  8. Select the correct statement:

    (a)

    Lithium carbonate is soluble in water

    (b)

    Potassium carbonate is soluble in water

    (c)

    Barium carbonate soluble in water.

    (d)

    Bicarbonate of lithium is soluble in water

  9. The by-product of Solvay ammonia process is:

    (a)

    CO2

    (b)

    NH3

    (c)

    CaCl2

    (d)

    CaCO3

  10. Which of the following does not give flame colouration?

    (a)

    BaCl2

    (b)

    CaCO3

    (c)

    SrCO3

    (d)

    MgCl2

  11. Part B

    6 x 2 = 12
  12. Explain what is meant by efflerescence.

  13. 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

  14. Give the systematic names for the following
    (i) milk of magnesia
    (ii) lye
    (iii) lime
    (iv) Caustic potash
    (v) washing soda
    (vi) soda ash
    (vii) trona

  15. Give the uses of gypsum

  16. Alkali metals give a characteristics colour for a bunsen flame. Explain why?

  17. Explain why alkali metals are very reactive.

  18. Part C

    6 x 3 = 18
  19. Lithium salts are more soluble than the salts of other metals of group 1. Justify.

  20. How does the alkali metals produce characteristic colour to the oxidising flame

  21. Why is the density of potassium less than that of sodium?

  22. Why does lithium exhibit anomalous properties?

  23. Why does the Li2+ ion combines only with O2- ion?

  24. Comment on each of the following observations:
    (a) Lithium is the only alkali metal to form a nitride directly by combination with nitrogen

  25. Part D

    2 x 5 = 10
  26. An alkali metal (A) belongs to period number II and group number I react with oxygen to form (B). (A) reacts with water to form (C) with liberation of hydrogen compound (D).Identify A, B, C and D.

  27. Describe Solvay process (or) how is washing soda (or) sodium carbonate prepared in industries?

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