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In what respect will two dry samples of nitrogen gas differ from each other if sample 1 ...

In what respect will two dry samples of nitrogen gas differ from each other if sample 1 is prepared by completely removing CO2 and O2 from air, and sample 2 is prepared by passing purified nitrogen(i)oxide over heated copper? sample 1 is

A. purer than sample 2
B. slightly denser than sample 2
C. in all respects the same as sample 2
D. colourless but sample 2 has a light brown colour
E. slightly less reactive than sample 2




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