NEET Questions Solved


Among the following surfactant molecules, the surfactant that forms micelles in aqueous solution at the lower CMC at ambient condition is:

(a) CH3CH215N+CH33Br-

(b) CH3CH211OSO3-Na+

(c) CH3CH26COO-Na+

(d) CH3CH211N+CH33Br-

(a) More is the hydrophobic character in surfactant molecule lesser is CMC in aqueous solution.

Difficulty Level:

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Which of the following does not form anionic micelle?

(a) C12H25COONa                    (b) C12H25SO4Na

(c) C12H25SO3Na                     (d) C12H25(NH3)3Cl

(d) In a, b, c anionic micelle is formed.

Difficulty Level:

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Milk can be preserved by adding a few drops of:

(a) formic acid solution             (b) formaldehyde solution

(c) acetic acid solution              (d) acetaldehyde solution

(b) Formalin acts as preservative for milk.

Difficulty Level:

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Which is an emulsion?

(a) Boot polish                             (b) Lipstic

(c) Shampoo                                (d) All of these

(d) Each one possesses two liquid phase, one dispersed in other; however they have low m.p.

Difficulty Level:

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Emulsions of polyvinylacetate are used in:

(1) polishes

(2)latex paints

(3)fire works

(4)rayons

(2) An application in paints based industry

Difficulty Level:

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The Critical Micelle Concentration (CMC) is:

(a) the concentration at which micellization starts

(b) the concentration at which true solution is formed

(c) the concentration at which one molar electrolyte is present per 1000 g of solution

(d) the concentration at which solute and solution from equilibrium

(a) It is the minimum concentration at which surfactant molecules undergo aggregation.

Difficulty Level:

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Detergent action of synthetic detergents is due to their:

(a) interfacial area

(b) high molar mass

(c) ionisation

(d) emulsifying properties

(d) The miscelles fromed by detergents in water solubilize the oily stain forming emulsion with it.

Difficulty Level:

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An emulsifier is a substance which:

(a)Homogenesis the emulsion

(b)stabliizes the emulsion

(c)retards the dispersion of liquid in liquid

(d)coagulates the emulsion

(b) Emulsifiers or emulsifying agent or emulgents are third component used to stablize a liquid-liquid sol,i.e., emulsion.

Difficulty Level:

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Which is an emulsifier?

(a)Soap

(b)oil

(c)NaCl

(d)water

(a) Soaps, surfactants, polymer and finely divided metal oxides and hydroxides are emulsifiers.

Difficulty Level:

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At the critical micelle concentration (CMC) the surfactant molecule

1. deccompose

2. dissociate

3. associate

4. become completely soluble

(3) Fact

Difficulty Level:

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