HSC Science Class 12 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Chemistry

Which one of the following is correctly matched?

The most effective electrolyte for the coagulation of As₂S₃ Sol is ____________.

Which one of the is not a surfactant?

The phenomenon observed when a beam of light is passed through a colloidal solution is ____________.

In an electrical field, the particles of a colloidal system move towards the cathode. The coagulation of the same sol is studied using

I. K₂SO₄

II. Na₃PO₄

III. K₄[Fe(CN)₆]

IV. NaCI

Their coagulating power should be

Collodion is a 4% solution of which one of the following compounds in the alcohol-ether mixture?

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As₂S₃ are given below

(I) (NaCl) = 52

(II) (BaCl₂) = 0.69

(III) (MgSO₄) = 0.22

The correct order of their coagulating power is:

On which of the following properties does the coagulating power of an ion depend?

Peptising agent is added to convert precipitate into colloidal solution. Explain with an example.

What happens when a colloidal sol of Fe(OH)₃ and As₂S₃ are mixed?

What is the difference between sol and gel?

Why are lyophillic colloidal sols are more stable than lyophobic colloidal sol?

Why does the bleeding stop by rubbing moist alum?

Comment on the statement:

Colloid is not a substance but it is a state of substance.

Explain any one method for coagulation.

Write a note on electro osmosis.

The formation of cyanohydrin from acetone is an example of ____________.

Reaction of acetone with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is:

\[\ce{CH2 = CH2 ->[i) O3][ii) Zn/H2O] X ->[NH3] Y}\] ‘Y’ is:

Predict the product Z in the following series of reactions.

\[\ce{Ethanoic acid ->[PCl5] X ->[C6H6][Anhydrous AlCl3] Y ->[i) CH3MgBr][H3O^+] Z}\]