Alkali and Alkaline Earth Metals Book Back Questions

11th Standard

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Chemistry

Time : 00:45:00 Hrs
Total Marks : 30
    5 x 1 = 5
  1. For alkali metals, which one of the following trends is incorrect?

    (a)

    Hydration energy: Li > Na > K > Rb

    (b)

    Ionisation energy: Li > Na > K > Rb

    (c)

    Density: Li < Na < K < Rb

    (d)

    Atomic size: Li < Na < K < Rb

  2. RbO2 is

    (a)

    superoxide and paramagnetic

    (b)

    peroxide and diamagnetic

    (c)

    superoxide and diamagnetic

    (d)

    peroxide and paramagnetic

  3. Lithium shows diagonal relationship with

    (a)

    sodium

    (b)

    magnesium

    (c)

    calcium

    (d)

    aluminium

  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. The product obtained as a result of a reaction of nitrogen with CaC2 is

    (a)

    Ca(CN)3

    (b)

    CaN2

    (c)

    CaCN2

    (d)

    Ca3N2

  6. 3 x 2 = 6
  7. Explain what is meant by efflerescence.

  8. Beryllium halides are Covalent whereas magnesium halides are ionic why?

  9. Why alkaline earth metals are harder than alkali metals.

  10. 3 x 3 = 9
  11. 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

  12. Write the chemical equations for the reactions involved in solvay process of preparation of sodium carbonate.

  13. Which would you expect to have a higher melting point magnesium oxide or magnesium fluoride? Explain your reasoning.

  14. 2 x 5 = 10
  15. Give the uses of gypsum

  16. Discus the similarities between beryllium and aluminium.

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