Physical Chemistry Multiple choice Questions & Answers 100% Accurate!!

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