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Question

Which of the following statement(s) is/are correct?
S1:SeF6 has the octahedral structure and PF5 has sp3d2 hybridization.
S2: The percentage of s-character in the orbital forming S−S bonds and P−P bonds in S8 and P4 molecules respectively are 25% and 33.3%.
S3: [Co(NH3)6]3+ is an inner orbital complex as well as diamagnetic in behaviour.

A
Only S1
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B
S2 and S3
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C
S1 and S3
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D
Only S3
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Solution

The correct option is D Only S3
S1: The central Se atom has 6 bond pairs of electrons and 0 lone pairs of electrons. It
undergoes sp3d2 hybridisation, which results in octahedral geometry. In case of PF5, the
central P atom has 5 sets of electron pairs (all of which are bonding) and sp3d2 hybridization
corresponds to 6 sets of electron pairs.Therefore PF5 is sp3d hybridized. Hence, statement 1 is
false.
S2:S8(sp3d2) and P4(sp3) both has 25% s- character.
S3: Orbitals in Co+3 ion

3d 4s 4p
Making Hybridized orbitals
d2sp3

[Co(NH3)6]3+


6 pairs of electrons from 6 NH3 molecules.
Inner 'd' orbitals are used in hybridization so its inner orbital complex. There are no
unpaired electrons so that it is diamagnetic.
Option D is correct.

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