00:01
Dear students, we have to consider the following statements and we have to determine how many of them are true and how many of them are false.
00:08
So bond angles for the first statement is bond angles for if6 plus are 60 degree each.
00:18
You see here if6 plus, if6 plus this is having octahedral geometry because it has 6 bond pairs of electrons and no lone pairs.
00:31
6 bond pairs plus 0 lone pairs.
00:35
Therefore, it has octahedral geometry and in octahedral geometry bond angle is 90 degree but not 60 degree.
00:44
So it is false.
00:47
Then the second one is silane is a polar molecule.
00:52
Silane sih4 is tetrahedral therefore it is symmetrical molecule and therefore it is non -polar.
01:07
So this is also a false statement.
01:09
Coming to the third one, the formal oxidation state of an atom in a molecule or molecular ion can be calculated as the number of valence electrons on the free atom that is the formal charge equal to number of valence electrons, number of valence electrons minus half the number of electrons in bonds to the atom that means total bonding electrons divided by 2 minus the number of unshared electrons, the number of unshared electrons.
01:51
Yes, this is right.
01:52
Therefore it is, this is the formula to determine the formal oxidation state or formal charge on an atom to find out the electron distribution around a molecule.
02:02
So this is true.
02:05
Then trf4 has a tetrahedral structure.
02:09
Krypton tetrafluoride, krypton is having 1 lone pair and 4 bond pairs.
02:19
Total 8 electrons, sorry.
02:21
So it is having 2 lone pairs and 4 bond pairs.
02:30
The bond pairs with fluorine like this 4 bond pairs.
02:36
So here 1, 4 bond pairs that means around it we have 6 pairs of electrons.
02:56
Out of that 4 are bond pairs and 2 are lone pairs.
03:06
4 are bond pairs and 2 are lone pairs...