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Free CLEP Science and Mathematics Exam Braindumps (page: 36)

Page 35 of 128
PDF with 494 Questions

The most probable oxidation number for the clement with atomic number 20 is

  1. -2
  2. -6
  3. +2
  4. +4
  5. +10

Answer(s): C

Explanation:

The clement with atomic number 20 is Calcium (Ca). Elements in the second row of the periodic table form ions with a +2 oxidation state in order to have a noble electron configuration.



Which of the following is most likely to be found in nature in gaseous form?

  1. Li
  2. P
  3. V
  4. Al
  5. N

Answer(s): E

Explanation:

Nitrogen may exist as gaseous N2, which comprises 80% of air. Lithium, phosphorous, vanadium, and aluminum exist as solids in nature.



1s22s22p63s23p5

Atoms of element X have the electronic configuration shown above. The compound most likely formed with calcium, Ca, is

  1. CaX
  2. Ca2X
  3. CaX2
  4. Ca2X2
  5. Ca2X3

Answer(s): C

Explanation:

The clement with the electron configuration shown is flourine. Flourine forms a -1 oxidation state, while calcium forms a +2 oxidation state. In order to form a neutral compound, one calcium and two fluorines are necessary.



CH3 ­ O ­ CH3

The organic molecule represented above is an example of a(n)

  1. ester.
  2. carboxylic acid.
  3. ether.
  4. alcohol.
  5. amine.

Answer(s): C






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