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Question

Which of the following is an ionic compound?

A
SO3
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B
ICl
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C
KI
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D
CHCl3
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Solution

The correct option is C KI
Ionic bond is formed between an metal and a non-mrtal.
To form an ionic bond, the bonded elements should have a large difference in electronegativity or in other words the ionisation energy of one should be low and the electron affinity of the other atom should be high.

SO3: Sulphur and Oxygen are both non-metals. Therefore, SO3 is a covalent compound.

ICl: Iodine and Chlorine are both halogen. Thus both have the tendency to gain electrons. Therefore, ICl is a covalent compound.

KI: Potassium is a metal and Iodine is a non-metal. Therefore, KI is an ionic compound due to the greater electronegativity difference between the two elements.

CHCl3: Carbon, hydrogen and chlorine are all non-metals and therefore CHCl3 is a covalent compound.

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