Most favourable condition for the formation of ionic bonds are:

Large cation and small anion

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Large cation and large anion

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Small cation and small anion

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Small cation and large anion

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Solution

The correct option is A Large cation and small anion
According to Fajan's rule smaller the size of cation and larger the size of anion, higher will be the covalent character in an ionic bond.
So most favourable condition for ionic bonding is when the size of cation is large and size of anion is small.

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