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The main commercial source of bromine is A. silver bromide ore. B. seawater. C. the Frasch...

The main commercial source of bromine is
A. silver bromide ore.
B. seawater.
C. the Frasch process.
D. phosphate rock.
E. the Ostwald process.


14. What element is the most abundant by mass in Earth's crust?
A. Fe
B. H
C. K
D. P
E. O


15. List the following acids in order of increasing acid strength: HOCl, HClO3, HClO4.
A. HOCl < HClO3 < HClO4
B. HClO4 < HClO3 < HOCl
C. HClO3 < HClO4 < HOCl
D. HOCl < HClO4 < HClO3
E. HClO3 < HClO < HClO4


16. The bond energy of F2 is unusually low, in comparison with the other halogens, due to the small size of the fluorine atom. Which of the following periodic properties is also unusually low in the case of fluorine?
A. first ionization energy
B. electron affinity
C. electronegativity
D. diatomic bond length
E. ionic radius

18. Write the formula for the binary hydride you would expect calcium to form.
A. CaH
B. Ca2H
C. Ca3H2
D. CaH2
E. None of the above

19. Write the chemical formula of the oxide ion.
A. O2–
B. O–
C. O2–
D. O22–
E. None of the above


20. Select True or False: P4O6 and P4O10 are allotropes of phosphorus.
A. True

B. False

21. Select True or False: Alkali metal hydrides are very reactive with water, forming H2 gas.
A. True

B. False

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