Q10.
B
[1]
Q11.
C
[1]
Q12.
(a) Correct diagram of NH3 including LP on N
1
Correct diagram of AlCl3
1
Bond angles in range 106-108° and bond angle of 120°
1
(b) Dative (covalent) /co-ordinate bond
Wrong bond CE=0 but mark on if covalent quoted
1
Shared pair of / both electrons come from the N(H3)
1
(c) Aluminium is now surrounded by 4 electron pairs/bonds or is tetrahedral
Independent
1
Therefore Cl-Al-Cl bond angle decreases / changes
(from 120° in AlCl3 ) to allow range 107-111° in H3NAlCl3
1
[7]