EXAMSHARE

Western Delta University, Oghara Delta State

department of basic and industrial chemistry
college of natural and applied sciences
western delta university

first semester examination 2022/2023 session

CHM303 - inorganic chemistry time: 3hrs

attempt any FOUR questions

  1. Question 1

    1. Write a reaction of sodium with oxygen and water (3 marks)
    2. Write short note on the following group 1 compounds:
      1. Hydrides
      2. Carbonates and hydrogen carbonates
      3. Hydroxides
      4. Halides
      (8 marks)
    3. Compare the carbonate and hydrocarbonates of a group 2 metals to that our group 1 (4 marks)
    4. Why is berrylium different from other members of the group? (3 marks)

  2. Question 2

    1. Briefly describe the chemistry of the following boron compounds
      1. Halides of Boron
      2. Diborane
      3. Boron trioxide
      (7.5 marks)
    2. Briefly describe the chemistry of the following compounds of carbon and silicon
      1. Hydrides
      2. Halides
      3. Oxides
      (7.5 marks)
    3. Suggest reasons why the maximum covalency of carbon is four while that of silicon is six (3 marks)

  3. Question 3

    1. Give reason(s) why the good halogens are good oxidizing agents (3 marks)
    2. Write a reaction of a named halogen with water and sodium hydroxide (4 marks)
    3. What are the uses of halogen (5 marks)
    4. Briefly describe the position of noble gas in the periodic table (6 marks)

  4. Question 4

    1. How does transition metal forms interstitial compounds? Give two examples of such compounds? (5 marks)
    2. Describe the variation of the density of alkali, alkaline earth and transition metals (4 marks)
    3. Briefly explain why zinc and cadmium are soft metals (4 marks)
    4. Which of Zn2+ and Cu2+ is a transition metal ion? Justify your answer (5 marks)

  5. Question 5

      1. What are lanthanides and actinides? (2 marks)
      2. Why are they so called? (2 marks)
      1. Why is the separation of the lanthanides so difficult (3 marks)
      2. List three important methods that can be used for the separation of lanthanide metals (3 marks)
      1. Outline some similarities between lanthanides and actinides (4 marks)
      2. Give two examples of double salts that can be formed by lanthanides (2 marks)
    4. Outline four uses of lanthanide elements or compound (2 marks)