Alkali and Alkaline Earth Metals Model Questions

11th Standard

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50
    10 x 1 = 10
  1. 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

  2. Lithium shows diagonal relationship with

    (a)

    sodium

    (b)

    magnesium

    (c)

    calcium

    (d)

    aluminium

  3. Which is the correct sequence of solubility of  carbonates of alkaline earth metals?

    (a)

    BaCO3 > SrCO3 > CaCO3 > MgCO3

    (b)

    MgCO3 > CaCO3 > SrCO3 > BaCO3

    (c)

    CaCO3 > BaCO3 > SrCO3 > BaCO3

    (d)

    BaCO3 > CaCO3 > SrCO3 > MaCO3

  4. The hydration enthalpies of alkali metal ions decreases in ______ order.

    (a)

    Li+ > Na+ > K+ > Rb+ > Cs+

    (b)

    Cs+ > Rb+ > K+ > Na+ > Li+​​​​​​​

    (c)

    Li+ > Rb+ > K+ > Na+ > Cs+​​​​​​​

    (d)

    Rb+ > Cs+ > K+ > Na+ > Li+

  5. The reducing power of a metal depends on various factors. Suggest the factor. which makes Li, the strongest reducing agent in aqueous solution

    (a)

    Sublimation enthalpy

    (b)

    Ionisation enthalpy

    (c)

    Hydration enthalpy

    (d)

    Electron-gain enthalpy

  6. Why Cs and K are used as electrodes in photoelectric cells

    (a)

    Due to their less ionisation energy

    (b)

    Due to high ionisation energy

    (c)

    Due to diagonal relationship

    (d)

    None of these

  7. Electronic configuration of 2s block of elements is

    (a)

    ns2

    (b)

    ns1

    (c)

    ns2np1

    (d)

    ns2np2

  8. Alkaline earth metals form basic hydroxides. The metal hydroxide which is most basic is _____

    (a)

    Mg(OH)2

    (b)

    Ca(OH)2

    (c)

    Sr(OH)2

    (d)

    Ba(OH)2

  9. Lime water turning milky is due to the formation of ______

    (a)

    calcium carbonate

    (b)

    calcium hydroxide

    (c)

    calcium hydroxide

    (d)

    calcium chloride

  10. Which of the following dissolves in water with a hissing sound?

    (a)

    bleaching powder

    (b)

    marble

    (c)

    quick lime

    (d)

    slaked lime

  11. 5 x 2 = 10
  12. Explain what is meant by efflerescence.

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

  14. Explain why atomic and ionic radii increases from lithium to caesium?

  15. Mention the uses of lithium.

  16. Discuss the biological importance of sodium and potassium.

  17. 5 x 3 = 15
  18. Mention the uses of plaster of paris

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

  20. Lithium salts are more soluble than the salts of other metals of group 1. Justify.

  21. Account for the following Li2CO3 is considerably less stable and decomposes readily in contrast to other alkali carbonates

  22. Why does Li2CO3 decompose at a temperature below 1273K?

  23. 3 x 5 = 15
  24. Explain the important common features of Group 2 elements.

  25. List out the uses of alkali metals

  26. Discus the similarities between beryllium and aluminium.

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