hey guys, i have 2 questions...hopefully u can help me out!

1. this multiple choice MAY have more than 1 answers...but i only got 1 answer so i just want to know whether u guys think there's only 1 answer as well.

Which of the following statements is/are incorrect?

(a) The exact momentum and position of an electron cannot be determined.
(b) Lower energy orbitals are filled with electrons before higher energy orbitals.
(c) When filling orbitals of equal energy, 2 electrons will occupy the same orbital before filling a new orbital.
(d) No two electrons in a particular atom can have the same value for all 4 quantum numbers.

(i got (c) as the incorrect statement. are there anymore there do u think?)

2. For which of the following species if more than one lewis (resonance) structure required to correctly describe the molecule?
(a) Li2S (b) NH3 (c) NO2- (d) ClO4- (e) none of these

(i got (c) where O=N-O. what do u guys think?)

Q2) C is correct. The thing is, d (ClO4-) is also correct but for more advanced reasons in that Cl does not obey the octet rule (Three double and one single bond to oxygens with 4 resonance structures).  However, many courses typically ignore this and picture it as having 4 single bonds to O to make it fit the octet rule which does not work in reality.

cool! thanks guys!

just a thing, the first question COULD have more than 1 answer..so I do you guys really think that c is the answer and that there arn't anymore?

oh, then does any1 know about the 2nd question?

cool! thanks guys!

just a thing, the first question COULD have more than 1 answer..so I do you guys really think that c is the answer and that there arn't anymore?

i was led to believe that a) was wrong as well, cos in some PHYSICAL textbooks, they say that EITHER the momentum, OR the position can be known. not both @ the same time..
it's a bit of an ambiguous phrasing....that a)