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Wednesday, June 10, 2020

Solid carbon dioxide, CO2, is similar to solid iodine, I2, in its structure and properties. Carbon is in Group 14. Silica, SiO2, is a Group 14 compound.


Question 8 [Chemical Bonding >3.2 Covalent bonding and co-ordinate (dative covalent) bonding including shapes of simple molecules]
Solid carbon dioxide, CO2, is similar to solid iodine, I2, in its structure and properties. Carbon is in Group 14. Silica, SiO2, is a Group 14 compound.

Which statement about solid CO2 and solid SiO2 is correct?
A Both solids exist in a lattice structure.
B Both solids have a simple molecular structure.
C Both solids have atoms joined by single covalent bonds.
D Both solids change spontaneously to gas at s.t.p.





Reference: Past Exam Paper – Chemistry (9701) March 2016 Paper 12 Q8





Solution:
     Answer: A


     Option A:  “It should be known that solid I2 has a simple molecular lattice, therefore it can be deduced from the information in the question that solid CO2 does too”


     Option B can be discredited since we know that SiO2 has a similar structure to diamond, i.e, a giant covalent structure, not simple molecular.


    Option C can be eliminated. While SiO2 has four single bonds, CO2 has two double bonds and is linear rather than tetrahedral like SiO2.


    Option D can be eliminated since at stp, SiO2 is a solid and will not change spontaneously (naturally) into a gas.

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