19) The City wave Lehman University York and from the determines Department Chem
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19) The City wave Lehman University York and from the determines Department Chemim number of function of nucleu orbital size radial for radial (the distance electron nodes a particular that atomic show both orbital size orbital for E Distance from nucleus (r) Distance from nucleus Distance from nucleus (r) Distance from nucleus (r) 200Which of the following statements is wrong? a. When two orbitals overlap in-phase with each other, a bonding molecular orbital forms. b. When two orbitals overlap out-ofphase with each other, an antibonding molecular orbital forms. lf any electrons are found in antibonding orbital(s), itmeans that no bond will form between atoms of that particular molecule d. All antibonding Mos are higher in energy than the atomic orbitals of which they are composed 21)The molecule xcls has a square pyramidal shape. Which ofthe following atoms could be X? a. c, Xe e. At least two of these atoms could be X.Explanation / Answer
19) option B
The radial distibution curves of s orbitals have number of peaks = n (prinicipal quantium number ) and number of minima = number of radial nodes = (n-1)
20) option C is wrong statement
The presence of antibonding electrons does not imply no bond.
If the number of electrons present in anti bonding molecular orbitals are equal to bonding molecular orbitals, then no bond is formed.
21)option D
SCl5- ion has 5 bonded electron pairs and one lone pair of electrons
S has 6 vlence electrons+ 5 from five Cl + one extra electron from negative charge = 12 .
Thus 5 bp and 1 lp, on central atom, the electron pair geometry is octhedral and molecular geometry is square pyramidal.
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