Statement I : Zeolites are used as ion exchangers and molecular sieves.Statement II : Zeolites consist cavities of different sizes and can trap Ca+2 ions from hard water and also molecules like NH3, CO2 etc.

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Both Statement I and Statement II are true

Statement I is true and Statement II is false

Statement I is false and Statement II is true

Both Statement I and Statement II are false

answer is A.

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Detailed Solution

(1) Sodium Zeolite is used to remove permanent hardness of water(used as water softner).the formula of Zeolite is Na2Al2Si2O8 .xH2O (or) simply NaAlSiO4 (or) NaZWhich is Known as Sodium Aluminium silicate(2) In sheet silicates , one-fourth or one-half of Silicon ions are replaced by Al+3 ions , then Zeolite formedThey trap Ca+2 ions from hard water and replace Na+ ions, hence acts as ion exchanger.2NaZ(s) + M+2 (aq.) →MZ2 (s) + 2Na+ (aq.) [ M = Mg , Ca ](3) The structure of Zeolite permits the formation of cavities of different sizes.Molecules like Water, NH3 , CO2and ethanol are trapped in these cavities.Hence Zeolites acts as molecular sieves

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