Which is an emulsifier?

(a)Soap

(b)oil

(c)NaCl

(d)water

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KClO3 on heating decomposes into KCl and O2. If some MnO2 is added the reaction goes much faster because:

(a) MnO2 decomposes to give oxygen

(b) MnO2 provides  heat by reacting

(c) better contact is provided by MnO2

(d) MnO2 acts as a catalyst

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The capacity of an ion to coagulate a colloidal solution depends on:

(a) its shape

(b) amount of its charge

(c) the sign of charge

(d) both amount and sign of the charge

Concept Questions :-

Colloidal Solution
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The blue colour of the water of the sea is due to :

(a) refraction of the blue light by the imputities in sea water

(b) reflection of blue light by sea water

(c) scattering of blue light by sol particles

(d) absorption of other colours except the blue colour by water molecules

Concept Questions :-

Colloidal Solution
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Blood contains :

(a) positively charged particles

(b) negatively charged particles

(c) neutral particles

(d) negatively as well as positively charged particles

Concept Questions :-

Colloidal Solution
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Lyophobic collloids are:

(a)reversible colloids

(b)irreversible colloids

(c)protective colloids

(d)gum, proteins

Concept Questions :-

Lyophilic and Lyophobic Sol
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Which statement about enzymes is not correct?

(a) Enzymes are in colloidal state

(b) Enzymes are catalysts

(c) Enzymes can catalyse any reaction

(d) Urease is an enzyme

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BaSO4 acts as.... for Pd in Rosenmund's reaction:

(a) promoter                       (b) poison

(c) auto-catalyst                  (d) none of these

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Gold number:

(a) may be defined as the milligram of the dry material of which the hydropholic sol is prepared and which when added to 10 mL of red gold sol, will prevent it from coagulation on the addition of 1mL of 10 percent sodium chloride solution.

(b) may be defined as the milligram of the dry material of which the hydrophilic sol is prepared and which when added to 1 mL of red gold sol will prevent it from coagulation on the addition of 10 mL of 10 percent sodium chloride solution.

(c) may be defined as the miligram of the dry material of which the hydrophilic sol is prepared and which when added to 1 mL of red gold sol will prevent it from coagulation on the addition of 1 mL of 1 percent sodium chloride solution

(d) none of the above 

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A liquid which makes scatters a beam of light (visible in dark room) but leaves no residue when passed through a filtre paper is best described as:

(a) a suspension

(b) sol

(c) true solution

(d) none of these

Concept Questions :-

Colloidal Solution
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