Very impressive, cucumber13!
You got all correct except Q28!
Q28. correct answer is B
mariogirl19 wrote, "it should be 3d5
4s1 instead of 3d4 4s2"
Actually, it is neither of the above. The correct configuration
for Fe2+ is 4s0 3d6 (or 3d6 4s0 if you prefer).
During ionization, electrons are always first removed from the
outer 4s subshell, before removing the inner 3d electrons.
Fe : [Ar] 4s2 3d6
Fe+ : [Ar] 4s1 3d6
Fe2+ : [Ar] 4s0 3d6
Fe3+ : [Ar] 4s0 3d5
Edited :
Just noticed you (cucumber13) also posted you had written an
incorrect answer for Q2, and only after the paper checked
online and realized the error. So your actual A level
P1 score should be 28/30 = 93.333% which is still excellent,
and which means that (assuming similar performance for your
P2) your overall grade for H1 Chemistry is quite easily an A
grade.
Congrats and all the best in your future studies and career!
Thank you so much for helping!! I've edited the answer for qn 28
:)
I'm so happy to see this good news after my A levels today
^^