Alkali and Alkaline Earth Metals Model Question Paper

11th Standard

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50
    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. Which of the following compounds will not evolve H2 gas on reaction with alkali metals?

    (a)

    ethanoic acid

    (b)

    ethanol

    (c)

    phenol

    (d)

    none of these

  3. Lithium shows diagonal relationship with

    (a)

    sodium

    (b)

    magnesium

    (c)

    calcium

    (d)

    aluminium

  4. The radioactive element of group 1 is ______

    (a)

    rubidium

    (b)

    cesium

    (c)

    francium

    (d)

    radium

  5. Half life of francium is _______

    (a)

    12.3 years

    (b)

    12.3 mins

    (c)

    21 years

    (d)

    21 mins

  6. 5 x 2 = 10
  7. How is plaster of paris prepared?

  8. An alkali metal (x) forms a hydrated sulphate, X2SO4•10H2O. Is the metal more likely to be sodium (or) potassium.

  9. Why alkali metals do not occur free in native?

  10. Explain the following:
    The second ionisation enthalpy values of alkali metals are high.

  11. Mention the uses of lithium.

  12. 5 x 3 = 15
  13. 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

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

  15. Why are potassium and caesium, rather than lithium used in photochemical cells?

  16. List down the uses of washing soda

  17. Why group 2 elements have positive electron gain enthalpy?

  18. 4 x 5 = 20
  19. Describe briefly the biological Importance of Calcium and magnesium

  20. List out the uses of alkali metals

  21. The hydrides of alkali metals behave as strong reducing agents - Justify the statement.

  22. Discus the similarities between beryllium and aluminium.

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