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chem mcq questions

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ayesha.:
Thanks question 9 same paper

CHEMMASTER6000:
yo react they both have to be in gaseous state and ions. this is has to be c gas and 0 atom not 02 because 02 is molecule

CHEMMASTER6000:
bring on the next one =) ;D

ayesha.:
yeah but isnt formation when 1 mol of a substance is formed from its elements  in their standard state...so isnt oxygens standard state o2?

CHEMMASTER6000:
im afraid not,

umm ok think of it this way formation is O2 is a molecule which means all of its bondong for both atoms are used . so where is carbon going to join ? but if you have o alone, then you get co which is not what you want .so its 2 O .

technically O in element form or standard state is O thats why O2 is not in the periodic table only O. its theory based. But in reality or practically O2 exists as a molecule. consider sulphur and phosphorous. they two are stated as p and s and not p4 and s8 which is what it really exists as

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