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Question

Which of the following is used in softening of water?

A
Aluminium borate
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B
Aluminium silicate
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C
Silicones
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D
Chlorosilanes
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Solution

The correct option is B Aluminium silicate
If Al atoms replace few Si atoms in 3D-network of SiO2, overall structure known as aluminosilicate. These are called Zeolites. These silicates are negative charged so they are balance by cations like Na+,K+.
These hydrated zeolites are used as ion exchangers in softening of “hard” water.
Sodium aluminium silicates, Na2Al2Si2O8, which is mainly used to remove the hardness of water.

THEORY
Zeolites: Zeolites are microporous, aluminosilicate minerals. Commonly used as commercial adsorbent and catalysts.
If Al atoms replace few Si atoms in 3D-network of SiO2, overall structure known as aluminosilicate. These are called Zeolites. These silicates are negative charged so they are balance by cations like Na+,K+.
  • These hydrated zeolites are used as ion exchangers in softening of “hard” water.
  • Sodium aluminium silicates, Na2Al2Si2O8, which is mainly used to remove the hardness of water.
  • Zeolites are widely used as a catalyst in petrochemical industries for the cracking of hydrocarbons and isomerization. Hydrated zeolites are used as ion exchangers in softening “hard” water.
  • ZSM-5 (A type of zeolite) used to convert alcohols directly into gasoline.

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