Nitrogen: Quiz


Question 1: Elemental nitrogen is a colorless, odorless, tasteless and mostly inert ________ gas at standard conditions, constituting 78% by volume of Earth's atmosphere.
OxygenChlorineDiatomic moleculeHydrogen

Question 2: The circulation of nitrogen from atmosphere to organic compounds and back is referred to as the ________.
BacteriaAmmoniaNitrogen cycleNitrogen fixation

Question 3: [16] However, because ammonium is preferentially retained by the forest canopy relative to atmospheric nitrate, most fixed nitrogen reaches the ________ surface under trees as nitrate.
SoilWater wellLandslideClay

Question 4: For similar reasons, pure molecular ________ typically emit light in the ultraviolet range.
Laser pumpingNitrogen laserHeliumElectrostatic discharge

Question 5: By far the most common is 14N (99.634%), which is produced in the ________ in stars.
CNO cycleStellar nucleosynthesisS-processAlpha process

Question 6: Of the ten isotopes produced synthetically, 13N has a ________ of ten minutes and the remaining isotopes have half-lives on the order of seconds or less.
Nuclear fissionRadioactive decayHalf-lifeCosmic ray

Question 7: It is a constituent element of amino acids and thus of proteins, and of nucleic acids (________ and RNA).

Question 8: Nitrogen gas is an industrial gas produced by the fractional distillation of liquid ________, or by mechanical means using gaseous air (i.e.
EarthHistory of the EarthNatureAtmosphere of Earth

Question 9: This is one of a variety of nitrogen ________ that form a family often abbreviated as NOx.

Question 10: When nitrogen reacts spontaneously with a reagent, the net transformation is often called ________.
Actinorhizal plantRhizobiaNitrogen fixationRoot nodule

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