In the compound [ICl2]+ [SbCl6]-, the oxidation number of chlorine is -1. What are the oxidation numbers of I and Sb in the compound?
I Sb
A +1 +5
B +1 +7
C +3 +5
D +3 +7 - ANSWER C
Which statement best explains why nitrogen has a larger first ionisation energy than oxygen?
A N atoms have...
Physical Chemistry Multiple choice
Questions & Answers 100% Accurate!!
In the compound [ICl2]+ [SbCl6]-, the oxidation number of chlorine is -1. What are the oxidation
numbers of I and Sb in the compound?
I Sb
A +1 +5
B +1 +7
C +3 +5
D +3 +7 - ANSWER C
Which statement best explains why nitrogen has a larger first ionisation energy than oxygen?
A N atoms have less repulsion between p-orbital electrons than O atoms.
B N atoms have a smaller nuclear charge than O atoms.
C N atoms lose an electron from the 2s subshell, while O atoms lose an electron from the 2p
subshell.
D N atoms have an odd number of electrons, while O atoms have an even number. - ANSWER A N
atoms have less repulsion between p-orbital electrons than O atoms.
Generally a high nuclear charge means that 1st ion attraction so more repulsion.
In the Periodic Table, element X is in Group 2 and element Y is in Group 15 (5). What is the likely
formula of an ionic compound of X and Y?
A X2Y5
B X2Y3
C X3Y2
D X5Y2 - ANSWER C X3Y2
X²⁺ and Y³⁻ use the drop and cross rule to get
Y₃X₂
The table below shows standard entropies, Sө.
Substance. CO(g) H2(g) CH3OH(l)
S ө / J mol-1 K-1 197.6 130.6 239.7
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