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Pick out the statement which is not true...

Pick out the statement which is not true

A

Sodium aluminium silicate is used in the softening of hard water

B

Potash alum is used in shaving rounds and as antiseptic in medicine

C

Artificial rain is caused by throwing electrified sand on the clouds from an aeroplane

D

Deltas are formed at a place where the river pours its water into the sea

Text Solution

Verified by Experts

The correct Answer is:
A
Softening of hard water involves removal of salts of `Ca^(2+)` and `Mg^(2+)`
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ERRORLESS-SURFACE CHEMISTRY-NCERT BASED QUESTIONS (Colloids, Emulsion, Gel and their properties with Application)
  1. The coagulation of 10 ml of colloidal solution of gold is completely p...

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  2. On addition of one mL solution of 10% NaCl to 10 mL gold sol in the pr...

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  3. Which of the following electrolytes will have maximum coagulating valu...

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  4. Which of the following process is responsible for the formation of del...

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  5. Milk can be preserved by adding a few drops of

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  6. To coagulate gelatin sol, which of the following is most effective ?

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  7. Which of the following ions can cause coagulation of protons ?

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  8. Which of the following colloids cannot be easily coagulated ?

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  9. If the dispersed phase is a liquid and the dispersion medium is a soli...

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  10. Alum helps in purifying water by :

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  11. Commercial detergents mainly contain

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  12. Give one example of aerosol and gel.

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  13. The emulsifying agent in milk is

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  14. Silver iodide is used for producing artificial rains because Agl

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  15. Pick out the statement which is not true

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  16. Cod liver oil is

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  17. The impurities present in rain water possess ……..charge.

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  18. Toilet soap is a mixture of

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  19. Colloidal gold is given by injection to act as

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  20. The aerosol is a kind of colloid in which :

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