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  • I need help with - Chemical Kinetics and Surface Chemistry - BITSAT

As_{2}S_{3} sol has a negative charge capacity to precipitate, it is highest in

  • Option 1)

    AlCl_{3}

  • Option 2)

    Na_{3}PO_{4}

  • Option 3)

    CaCl_{2}

  • Option 4)

    K_{2}SO_{4}

 

Answers (1)

As we learned in concept

Properties of Colloidal Solutions -

Coagulation or Precipitation

- wherein

The stability of the lyophobic sols is due to the presence of charge on colloidal particles. If somehow the charge is removed the particles will come nearer to each other and settle down under gravity.

 

 Negatively charged As_2S_3 sol will be most easily precipitated in AlCl_3 because Al^{3+} has maximum positive charge as compared to other ions. 

The order of precipitation will be 

Al^{3+}> Ca^{2+}>Na= K^{+}

 


Option 1)

AlCl_{3}

Correct option

Option 2)

Na_{3}PO_{4}

Incorrect option

Option 3)

CaCl_{2}

Incorrect option

Option 4)

K_{2}SO_{4}

Incorrect option

Posted by

Vakul

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