Peptization is a process of:

  • Precipitating colloidal particles.

  • Purifying colloidal particles.

  • Dispersing the precipitate into a colloidal state.

  • None of the above.

Which acts as poison for Pd-charcoal in lindlar's catalyst ?

  • BaSO4

  • Quiniline

  • Both 1. and 2.

  • None of these

Electrolyte that is least effective in causing coagulation of +ve ferric hydroxide sol is -

 

  • KBr

  • K2SO4

  • K2CrO4

  • K3[Fe(CN)6]

Platinized asbestos used as a catalyst in the manufacture of H2SO4 is an example of:

  • heterogeneous catalyst                   

  • auto-catalyst

  • homo-catalyst                                 

  • induced catalyst

In a reversible reaction, a catalyst:

  • increases the rate of the forward reaction only

  • increases the rate of the forward reaction to a greater extent than that of  the backward reaction

  • increases the rate of the forward reaction and decreases that of the backward reaction to the different extent

  • increases the rate of the forward and backward reactions equally

Gas masks containing activated charcoal remove poisonous gases from the atmosphere, and act on the principle of:

  • Adsorption

  • Absorption

  • Sorption

  • All of these

Tanning of leather is:

  • coloring of leather by chemicals

  • drying process to make the leather hard

  • polishing of leather to make it look attractive

  • coagulative hardening of the leather by chemicals

When sulphur sol is evaporated solid sulphur is left. On mixing with water no colloidal sol is formed. Sulphur sol is: 

  • hydrophilic

  • hydrophobic

  • reversible

  • lyophilic

The Critical Micelle Concentration (CMC) is:

  • The concentration at which micellization starts

  • The concentration at which true solution is formed

  • The concentration at which one molar electrolyte is present per 1000 g of solution

  • The concentration at which solute and solution from equilibrium

On adding 1 mL solution of 10% NaCl to 10 mL gold solution in the presence of 0.25 g of starch, the coagulation is just prevented. Starch has the gold number equal to:

  • 0.25                     

  • 2.5

  • 250                     

  • 0.025

Sol that is not lyophilic colloid is -

  • Milk

  • Gum

  • Fog

  • Blood

Hardy-Schulze rule states that:

  • non-electrolytes have better coagulating action on colloids than electrolytes

  • sols are coagulated by effective ions whose charge is opposite to that of sol and the ions of higher charge are much more effective than the ions of lower charge

  • charge of the ions has no effect on the coagulation of a sol

  • sols are coagulated only by those ions whose charge is similar to that of the sol

An example of intrinsic colloid is:

  • As2S3 sol                         

  • Fe(OH)3 sol

  • egg albumin                     

  • Au sol

Tails of comets are visible due to:

  • Tyndall effect

  • Reflection

  • Brownian motion

  • None of the above

Bleeding is stoped by the application of ferric chloride. This is because :

  • the blood starts flowing in the opposite direction

  • the blood reacts and a solid is formed which seals the blood vessel

  • the blood is coagulated and the blood vessel are sealed

  • the ferric chloride seals the blood vessel

The Brownian movement occurs in:

  • Colloidal solution.

  • True solution.

  • Suspension having size <500 mμ.

  • All of the above.

A dust storm is:

  • Dispersion of solid in gas

  • Dispersion of a gas in solid

  • Dispersion of solid in solid

  • Dispersion of a gas in liquid

Which is not a colloid?

  • Chlorophyll                                   

  • Egg white

  • Ruby glass                                   

  • Milk

Chemisorption is:

  • multimolecular in nature

  • reversible

  • often highly specific and directional

  • not very specific

The catalyst used in the lead-chamber process of sulphuric acid is:

  • platinum

  • nitric oxide

  • nickel

  • vanadium pentoxide

Medicines are more effective if they are used in:

  • Colloidal state

  • Solid-state

  • Solution state

  • None of the above 

Hydrolysis of maltose (C12H22O11) by maltase gives:

  • glucose                         

  • fructose

  • both 1 and 2         

  • none of these

Hydrolysis of cane-sugar is catalysed by:

  • H+                         

  • mineral acids

  • enzymes                 

  • all of these

Which is not shown by sols?

  • Adsorption

  • Tyndall effect

  • Flocculation

  • Paramagnetism

Detergent action of synthetic detergents is due to their:

  • interfacial area

  • high molar mass

  • ionization

  • emulsifying properties

The name aquadag refers for:

  • Cu in water sol.

  • Pt in water sol.

  • Graphite in water sol.

  • None of the above.

Addition of FeCl3 to K4[Fe(CN)6] in dilute and cold solution gives:

  • Prussian blue sol.                     

  • Fe4[Fe(CN)6]3 sol.

  • Positive sol.                               

  • All of the above.

Among the electrolytes Na2SO4, CaCl2, Al2(SO4)3 and NH4Cl, the most effective coagulating agent for Sb2S3 sol is :

  • Na2SO4                             

  • CaCl2

  • Al2(SO4)3                           

  • NH4Cl

A negatively charged suspension of clay in water needs for precipitation the minimum amount of:

  • Aluminium chloride.

  • Potassium sulphate.

  • Sodium hydroxide.

  • Hydrochloric acid.

The arsenious sulphide sol has negative charge. The maximum coagulationg power for precipitating it is of :

  • 0.1 N Zn(NO3)2

  • 0.1 N Na3PO4

  • 0.1 N ZnSO2

  • 0.1 N AlCl3

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