Home
Class 12
CHEMISTRY
SnO(2) forms positively charged colloida...

`SnO_(2)` forms positively charged colloidal sol in acidic medium and negatively charged colloidal sol in basic medium. Explain ?

Text Solution

Verified by Experts

`SnO_2` is amphoteric in nature and reacts with acids as well as bases. It reacts with acids, e.g., HCl to form `SnCl_4` in solution. The common `Sn^(4+)` ions are adsorbed on the surface of `SnO_2` forming positively charged sol :
`SnO_2 + 4HCl to SnCl_4 + 2H_2O`
`SnO_2 + Sn^(4+) to underset("Positive sol")(SnO_2 : Sn^(4+)`
`SnO_2` reacts with a base e.g., NaOH to form sodium stannate `(Na_2SnO_3)` in the solution. The stannate ions are adsorbed on the surface of `SnO_2` to from negatively charged sol.
`SnO_2 + 2NaOH tounderset("Sodium stannate")(Na_2SnO_3 + H_2O)`
`SnO_2 + SnO_3^(2-) to underset("Negative sol")(SnO_2 : SnO_3^(2-))`
Promotional Banner

Topper's Solved these Questions

  • SURFACE CHEMISTRY

    MODERN PUBLICATION|Exercise COMPETITION FILE (OBJECTIVE TYPE QUESTIONS) (A. MULTIPLE CHOICE QUESTIONS WITH ONLY ONE CORRECT ANSWER)|26 Videos

  • SURFACE CHEMISTRY

    MODERN PUBLICATION|Exercise COMPETITION FILE (OBJECTIVE TYPE QUESTIONS) (B. MULTIPLE CHOCE QUESTIONS FROM COMPETITIVE EXAMINATIONS)|49 Videos

  • SURFACE CHEMISTRY

    MODERN PUBLICATION|Exercise REVISION EXERCISE (LONG ANSWER QUESTIONS )|13 Videos

  • SOLUTIONS

    MODERN PUBLICATION|Exercise UNIT PRACTICE TEST|14 Videos

Similar Questions

Explore conceptually related problems

SnO_(2) form a positively charged colloidal sol in the acidic medium and negatively charged sol in the basic medium. Explain.

All colloidal sols show:

Give one example of positively charged sol and one example of negatively charged sol.

Metal sol is negatively charged.

The sol given below with negatively charged colloidal particles is :

What will happen if equimolar solution of positively and negatively charged colloidal sols be mixed ?

Smoke is a colloidal sol of

Knowledge Check

  • All colloidal sols show:

    A
    Very high osmotic pressure
    B
    High osmotic pressure
    C
    Low osmotic pressure
    D
    No osmotic pressure

  • Mixing of positively charged colloidal solution with negatively charged colloidal solution brings __________. The decreasing order of coagulating power of Na^(+), Ba^(2+) and Al^(3+) for negatively charged colloidal solution is ________ .

    A
    mutual coagulation , `Na^(+) gt Ba^(2+) gt Al^(3+)`
    B
    mutual coagulation , `Al^(3+) gt Ba^(2+) gt Na^(+)`
    C
    coagulation , `Na^(+) gt Ba^(2+) gt Al^(3+)`
    D
    Peptization , `Al^(3+) gt Ba^(2+) gt Na^(+)`

  • Smoke is a colloidal sol of

    A
    Gas dispersed in a solid
    B
    solid dispersed in a gas
    C
    solid dispersed in a liquid
    D
    gas dispersed in a liquid