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JEE Main levelSingle correct optionDifficulty 2 of 3pb083

The cation-exchange property of aluminosilicate zeolites is best explained by

Areplacement of some $Al X^{3 +}$ by $Si X^{4 +}$ , which leaves a net positive charge on the framework
Bstrong covalent bonding of $Na X^{+}$ to the framework oxygens
Cthe presence of free $π$ electrons in the channels
Dreplacement of some $Si X^{4 +}$ by $Al X^{3 +}$ in the framework, which leaves a net negative charge balanced by mobile cations

Answer: D

Substituting trivalent Al for tetravalent Si in the

SiO X_{4}

/

AlO X_{4}

framework creates one negative charge per Al. Cations such as

Na X^{+}

or

Ca X^{2 +}

sit in the channels to balance it and can be exchanged for others.

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