Each question is followed by up to five lettered responses (A-E). For each question choose the response which is the best answer to the question.

1. Careful analysis of atomic emission spectra sometimes shows sets of lines very similar to those of atomic hydrogen. Such lines are given by the following species:
   

   1.   ?    He, Li, Be
   2.   ?    He+, Li2+, Be3+
   3.   ?    Li, Na, K
   4.   ?    He-, Li, Be+
   5.   ?    He, Li+, Be2+

2. In which one of the following does the flame coloration correspond to the ion?
   

   1.   ?    Mg2+ yellow
   2.   ?    Sr2+ green
   3.   ?    Ba2+ white
   4.   ?    Ca2+ red

3. Which one of the following shows the preferred barium compound used in flame spectroscopy and the colour produced?
   

   1.   ?    barium chloride/ green
   2.   ?    barium chloride/ red
   3.   ?    barium sulphate/ green
   4.   ?    barium sulphate/ red

4. Which one of the following metal halide solutions will not produce a red colour when sprayed into a Bunsen burner flame?
   

   1.   ?    calcium chloride
   2.   ?    lithium chloride
   3.   ?    sodium bromide
   4.   ?    strontium bromide

5. In the line spectrum of atomic hydrogen in which region of the electromagnetic spectrum will lines not appear?
   

   1.   ?    X-ray
      
   2.   ?    ultraviolet
   3.   ?     infra-red
   4.   ?     visible

6. Which one of the following statements about the emission spectrum of hydrogen is correct?
   

   1.   ?    The complete spectrum occurs in the visible region.
   2.   ?    All the lines in the spectrum correspond to electron transitions from higher energy levels to the ground state.
   3.   ?    The value for the ionisation energy of hydrogen can be determined from the spectrum.
   4.   ?    The number and/or position of lines in the spectrum cannot be influenced by external factors.

7. In which one of the following does the flame coloration correspond to the ion?
   

   1.   ?     Ca²⁺ red
   2.   ?     Ba²⁺ white
   3.   ?     Sr²⁺ green
   4.   ?     Mg²⁺ yellow

8. The flame colour associated with potassium salts is
   

   1.   ?     green
   2.   ?     yellow
   3.   ?     red
      
   4.   ?    lilac

9. The atomic spectrum of hydrogen shows
   

   1.   ?     equally spaced lines not confined to the visible spectrum
   2.   ?     a continuum in which individual lines are not apparent
   3.   ?    equally spaced lines in groups separated by a continuum in the visible spectrum
   4.   ?     a series of lines which get closer together as the frequency increases

10. Which one of the following statements about the line emission spectrum for atomic hydrogen is incorrect?
    
    

    1.   ?    Electromagnetic radiation is emitted when the electron is promoted to a higher energy level.
    2.   ?    The electron can only move between fixed energy levels.
    3.   ?    In the visible region of the spectrum the electron returns to the n = 2 energy level.
    4.   ?    The lines in the spectrum converge as the frequency increases.

11. The emission line spectrum of atomic hydrogen arises from the energies given out when
    

    1.   ?    hydrogen atoms lose electrons to form ions.
       
    2.   ?    hydrogen atoms combine together to form molecules.
    3.   ?    electrons move to energy levels further away from the nuclei.
       
    4.   ?    electrons move to energy levels closer to the nuclei.