Which of the following have 10 electrons in the d orbitals? Mn Fe Cu Zn two of t

Question

Which of the following have 10 electrons in the d orbitals? Mn Fe Cu Zn two of the above Which of the following bonds would be the least polar, yet still be considered polar covalent? Mg-O C-O O-O Si-O N-O Which of the following has the smallest radius? K^+ Cl^- Rb^+ S^2- Ar What is the molecular geometry of PF_3? linear trigonal pyramidal bent tetrahedral trigonal bipyramidal What is the hybridization state of the central atom in PBr_3 molecule? Sp sp^2 sp^3 dsp^3 d^2 sp^3 Which element atom has the electron configuration of [Xe]6s^2 4f^14 5d^10 6p^4? Bi Rn Th Kr none of these

Explanation / Answer

25. Copper electronic configuration is : [Ar] 4s1 3d10

       Zinc electronic configuration is : [Ar] 4s2 3d10

Hence Cu and Zn have 10 electrons in d - orbitals.

26. a)Mg-O is ionic bond (polar)

b) C-O is polar covalent bond

c) O-O is non-polar covalent bond.

d) Si-O is polar covalent bond but the electronegativity difference is more in this molecule compared to C-O bond.

e) N-O is also polar covalent bond but the eelcronagativity difference is very less compared to C-O and Si-O bonds.

Hence the answer is N-O.

27. K+ , Cl- , Ar, S-2 are iso electronic species and Rb+ has largest radius among the given options.

Among the iso electronic species, the cation with more +ve charge has the smallest radius.

Hence the answer is K+

28. In PF3 the central atom P has hybridisation sp3 and it has one lone pair, hence the molecular geometry is

trigonal pyramidal.

29. The hybridisation in the P-atom in PBr3 is ---------- sp3.

P- electronic configuration is -------- [Ne]3s2 3px1 3py1 3pz1

This four orbitals s and p will overlap and form 4 sp3 hybrid orbitals.

3 sp3 hybrid orbitals will form 3 sigma bonds with p-orbitals of Br and the remaining sp3 hybrid orbital has a lone pair.

30. The element is : 54+ 2+14+10+4 = 84 which is Polonium.

Which is not given in the options,

Hence the answer is option e.

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