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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1101. |
Assertion : During adsorption, `DeltaG, DeltaH and DeltaS` decrease i.e., their values become negative. Reason : Adsorption is a spontaneous process. Randomness ofr disorder decreases during adsorption.A. Statement -1 is True, Statement -2 is True, Statement -2 is a correct explanation for Statement - 1B. Statement -1 is True, Statement -2 is True, Statement -2 is NOT a correct explanation for Statement - 2C. Statement - 1 is True, Statement - 2 is FalseD. Statement - 1 is False, Statement - 2 is True |
| Answer» Correct Answer - A | |
| 1102. |
Adsorption of a gas on the surface of solid is generally accompanied by decrease entropy. Still it is a spontaneous process. Explain. |
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Answer» Adsorption is accompanied by decrease in enthalpy as well as decrease in entropy of the system. For a process to be spontaneous there is a decrease in Gibbs Energy. `to` On the basis of equation `DeltaG= DeltaH-T DeltaS, DeltaG = -Ve` If `DeltaH` has sufficiently high negative value and `TDeltaS `is positive. `to` In an adsorption process which is spontaneous `DeltaH` becomes negative by combining about . `to` As the adsorption proceeds ` DeltaH` becomes less and less negative ultimately, `DeltaH` becomes equal to `TDeltaS` and `DeltaG` becomes zero. At this state equilibrium is attained. |
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| 1103. |
Assertion : In the coagulation of a negative sol the flocculating power is in the order : `Al^(3+) gt Ba^(2+) gt Na^(+)` Reason : Greater the valence of the flocculating ion added, greater is its power to cause precipitation.A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason is not the correct explanation of assertionC. If assertion is true but reason is falseD. if both assertion and reason are false |
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Answer» Correct Answer - A This is Hardy-Schulze rule. |
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| 1104. |
On addition of one ml solution of `10% NaCl` to 10 ml gold solution in the presence of `0.009` g of an anticoagulant, the coagulation is prevented. What is the gold number of anticoagulant? |
| Answer» Correct Answer - 9 | |
| 1105. |
Gold number is minimum in case of…………… |
| Answer» Correct Answer - Gelatin | |
| 1106. |
Which of the following is not a method of removing impurities from a colloidal sol ?A. ElectrodialysisB. UltrafiltrationC. Ultra centrifugationD. Distillation |
| Answer» Correct Answer - D | |
| 1107. |
Bleeding is stopped by the application of ferric chloride. This is due to ……….. Of blood. |
| Answer» Correct Answer - Coagulation | |
| 1108. |
The ability of the protective colloid is measured in terms of………………. |
| Answer» Correct Answer - Gold number | |
| 1109. |
The phenomenon of scattering of light by colloidal particle is celled…………… |
| Answer» Correct Answer - Tyndall effect | |
| 1110. |
The process of removing dissolved substance from a colloidal solution by means of diffusion through a suitable membrane is termed as………….. |
| Answer» Correct Answer - Dialysis | |
| 1111. |
The dispersion medium in aerosol is……………. |
| Answer» Correct Answer - Gas | |
| 1112. |
The dispersion medium in aerosol is…………….A. Dispersion of a solid or liquid in a gasB. Dispersion of a solid in a liquidC. Dispersion of a liquid in a liquidD. Solid solution |
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Answer» Correct Answer - A An aerosol is a dispersion of a solid or liquid in a gas. |
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| 1113. |
Gelatian is mostly used in making ice cream in order toA. Prevent making of coloidB. To stabilise the colloid and prevent crystallisationC. To stabilise mixtureD. To enrich the aroma |
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Answer» Correct Answer - B Gelatin is protective colloid. |
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| 1114. |
Which of the following statements are correct ?A. Maxing two oppositely charged sols neutralises their charges and stabilises the colloid.B. Presence of equal and similar charges on colloidal particles provides stability to the colloids.C. Any amout of dispersed liquid can be added to emulsion without destabilising it.D. Brownian movement stabilises sols. |
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Answer» Correct Answer - B::D are correcr statements. |
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| 1115. |
An emulsion cannot be broken by ……….and …….. .A. heatingB. adding more amout of dispersion mediumC. freezingD. adding emulsifying agent |
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Answer» Correct Answer - B::D are cprrect statements. |
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| 1116. |
In the manufacture of `H_(2)SO_(4)` by contact process, the presence of `As_(2)O_(3)` acts as :-A. Catalytic promoterB. Catalytic poisonC. Induced catalystD. Autocatalyst |
| Answer» Correct Answer - B | |
| 1117. |
The volume of nitrogen gas `Vm` (at STP) reqired to cover a sample of silica gel with a monomolecular layer is `129cm^(3)g^(-1)` of gel. Calculate the surface area per gram of the gel if each nitrogen molecule occupies `16.23xx10^(-20)m^(2)` . |
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Answer» `22400cm^(3)` of `N_(2)` at STP contain `=6.023xx10^(23)` molecules `:.129cm^(3)` of `N_(2)` at STP will contain `=(6.023xx10^(23)xx129)/(22400)=3.468xx10^(21)` molecules Area occupied by a single molecule `=16.2xx10^(-20)m^(2)` Therefore, area occupied by `3.468xx10^(21)` molecules of `N_(2)=(162.2xx10^(-20))xx(3.468xx10^(21))m^(2)=561.8m^(2)` Therefore, surface area per gram of gel `=561.8m^(2)` `22400cm^(3)` of `N_(2)` at STP contain `=6.023xx10^(23)` molecules `:.129cm^(3)` of `N_(2)` at STP will contain `=(6.023xx10^(23)xx129)/(22400)=3.468xx10^(21)` molecules Area occupied by a single molecule `=16.2xx10^(-20)m^(2)` Therefore, area occupied by `3.468xx10^(21)` molecules of `N_(2)=(162.2xx10^(-20))xx(3.468xx10^(21))m^(2)=561.8m^(2)` Therefore, surface area per gram of gel `=561.8m^(2)` |
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| 1118. |
The volume of nitrogen gas Um (measured at STP) required to cover a sample of silica get with a mono-molecular layer is `129 cm^(3) g^(-1)` of gel. Calculate the surface area per gram of the gel if each nitrogen molecule occupies `16.2 xx 10^(-20) m^(2).` |
| Answer» Correct Answer - `56` | |
| 1119. |
Which of the option(s) regarding true/false nature of the statement is/are correct? S-1 : Out of all colligative properties, osmotic pressure is easisest to determine experimentally. S-2 : Chemisorption is a multilayer process. S-3 : Solubility of gases in water increases with increase in temperature. S-4 : Addition of NaCl can cause coagulation in both +vely charged and -vely charged sols. S-5 : Enzyme catalysed reactions are elementary reactions. S-6 : For the same atomic radius, the density of an element will be greater for BCC lattice than FCC lattice.A. There are more false statements than true statementsB. S-3 and S-5 are false statementsC. S-1 and S-4 are the only true statementsD. Only S-1 is a true statement |
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Answer» Correct Answer - A::B::C |
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| 1120. |
Adsorption power of the adsorbent can be increased:A. by increasing surface areaB. by finely dividing itC. by making it porousD. All of these |
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Answer» Correct Answer - D All the three factors are correct. |
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| 1121. |
Which of the following is not a surface phenomenon?A. Heterogeneous catalysisB. Fusion of solidsC. CorrosionD. Electrolysis process. |
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Answer» Correct Answer - D Process of electrolysis is not a surface phenomenon. |
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| 1122. |
Describe the cleaning action of soap.A. non - polar tails of soap molecules dissolve in greaseB. oil and grease dissploves into hydrophilic centres of soap micelles acid washed awayC. hydrophilic heads dissolves in greaseD. hydrophilic heads dissolves in grease |
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Answer» Correct Answer - a |
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| 1123. |
Brownian movement can be seen easily in case ofA. true solutionB. colloidal solutionC. suspensionD. all of these |
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Answer» Correct Answer - B Brownian movement is too fast to be seen in true solution on account of small size of solute particles and is too slow to be seen in a suspension on account of larger size of suspended particles. Brownian movement provides a direct demonstration of ceaseless motion of molecules as postulated by kinetic theory. It also counters the force of gravitey acting on colloidal particles and hence helps in providing stabIlity to colloidal sols by not allowing them to settle down. |
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| 1124. |
How can we remove moisture from glass apparatus? |
| Answer» This can be done by placing anhydrous `CaCl_(2)` in the apparatus which absorbs the moisture. This can be done by placing anhydrous `CaCl_(2)` in the apparatus which absorbs the moisture. | |
| 1125. |
What type of substances form lyophobic sols? |
| Answer» Substances such as metal, their sulphites, etc., which do not mix directly with the dispersion medium to form a colloidal sol. Substances such as metal, their sulphites, etc., which do not mix directly with the dispersion medium to form a colloidal sol. | |
| 1126. |
which of the following adsorption isotherms represents the adsorption of a gas by a soild involvey multillayers of formation ? `(p_(s)`= saturation pressure)A. B. C. D. |
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Answer» Correct Answer - a |
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| 1127. |
Position of non-polar and polar parts in micelle isA. polar at outer surface but non-polar at inner surfaceB. polar at inner surface but non-polar at outer surfaceC. distributed all over the surfaceD. present in the surface only |
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Answer» Correct Answer - A Micelles are the clusters formed by the association of colloids. They are formed by lyophilic and lyophobic groups. As the concentration increases, the lyophobic parts receding away from the solvent approach each (non-polar part) other and form a cluster, the lyophobic ends are in the interior, lyophilic groups (polar part) projecting outward in contact with the solvent. |
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| 1128. |
Position of non-polar and polar parts in micelle isA. polar at outer surface but non`-` polar at inner surfaceB. polar at inner surface but non`-` polar at outer surfaceC. distributed all over the surfaceD. present in the surface only |
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Answer» Correct Answer - 1 Micelles are in the clusters formed by the association of colloids. They are formed by lyophillic and lyophobic groups . As the concentration is increased the lyophobic parts receding away from the solvent approach each other and form a cluster, the lyophobicends are in the interior lyophillic groups projecting outward in contact with the solvent. |
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| 1129. |
Statements : A catalyst enhances the rate of a reactgion . Expabnations : The energy foactivation of the reaction is lowered in presence of a catarge of the coagualnt ion.A. S is correct but E is wrong .B. S is worong but E is correctC. Both S and E are correct and E is correct explanation of (S) .D. Both S and E are correct but E is not correct explanation of S. |
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Answer» Correct Answer - C Explanation is correct reason for statement . |
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| 1130. |
Statements : In the presence of promter, the activity of the catalyst is enhanced . . Expabnations : The promter increases the surface area of the catlyst nad thus enhancing the number of active centres .A. S is correct but E is wrong .B. S is worong but E is correctC. Both S and E are correct and E is correct explanation of (S) .D. Both S and E are correct but E is not correct explanation of S. |
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Answer» Correct Answer - C Explanation is correct reason for statement . |
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| 1131. |
Assertion : In the presenced of promote, the activity on the surface of catalyst is enhanced. Reason : Promote increase the surface area of the catalyst and as a result, the number of active centres increase.A. If both assertion and reason are correct and reason is correct explanation for assertion.B. If both assertion and reason are correct but reason is not correct explanation for assertion.C. If assertion is correct but reason is incorrect.D. If assertion and reason both are incorrect. |
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Answer» Correct Answer - A Reason is the correct explanation for assertion. |
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| 1132. |
Which statement about enzymes is not corect ?A. Enzymes are in collodal stateB. Enzymes can act as catalystsC. Enzymes can catalyse any ractionD. Urea is an enzyme |
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Answer» Correct Answer - C Enzyme catalysed reactions are highly specific . i.e., one enzyme catalysed only one raction . |
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| 1133. |
Which acts as poison for Pd-charcoal in Lindlar cataluyst ?A. ` BaSO_4`B. quinolineC. Both a and bD. none of these |
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Answer» Correct Answer - C Either ` BaSO_4` or quinoline are used to reduce the acitvity of ` Pd-`charcoal . The catlyst Pd-charcoal /`BaSO_4` or quinoline is used to hydrogenate aljyne to hydrogenate alkyne to alkene only . `CH=CH +H_(2) overset("Lindlar catalyst")rarr CH_(2) = CH_(2)` |
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| 1134. |
In a coagulation experiment, `5mL` of `As_(2)S_(3)` is mixed with distilled water and `0.1M` solution of an electrolyte `AB` so that the total volume is `10mL` . It was found that all solutions sontianing more than `4.6mL` . Of `AB` coagulate within `5` min. What is the flocculation value of `AB` for `As_(2)S_(3)` solution? |
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Answer» A minimum of `4.6mL` of `AB` is required to coagulation the solution. The moles of `AB` in the sol is `=(4.6xx0.1)/(10)=0.046mol` This means that a minimum of `0.046mol` or `0.046xx1000=46` m mol are required coagulating `1L` of solution. Flocculation value of `AB` for `As_(2)S_(3)sol=46` A minimum of `4.6mL` of `AB` is required to coagulation the solution. The moles of `AB` in the sol is `=(4.6xx0.1)/(10)=0.046mol` This means that a minimum of `0.046mol` or `0.046xx1000=46` m mol are required coagulating `1L` of solution. Flocculation value of `AB` for `As_(2)S_(3)sol=46` |
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| 1135. |
Why is adsorption always exothermic? |
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Answer» During the adsorption, there is always a decrease in residual forces of the surface. There is decrease in surface energy which appears as heat. `therefore ` Adsorption is aIways Exothermic. |
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| 1136. |
Assertion: Aquenous gold colloidal solution is red in colour. Reason: The colour ariesedue to scattering of light by colloidal gold particles.A. if both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertionC. If assertion is true but reason is false.D. If the assertion and reason both are false. |
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Answer» Correct Answer - A Both assertion and reason are true and reason is the correct explanation of assertion. Scattering of light is the main phenomenon of colloidal particles in which colloidal particles scatter a particular wavelengths light. |
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| 1137. |
Adsorption is always exothermic in nature , Do you agree ?A. EndothermicB. ExothermicC. Either (a) or (b)D. None of these |
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Answer» Correct Answer - B Adsorption is an exothermic process. |
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| 1138. |
Name the enzymes used in Conversion of proteins into peptides in stomach. |
| Answer» The enzyme used in conversion of proteins into peptides in stomach is pepsin. | |
| 1139. |
What enzymes are obtained from yeast ? |
| Answer» The enzymes obtained from yeast are invertase, zymase and maltase. | |
| 1140. |
At what ranges of temperature and pH, enzymes are active ? |
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Answer» `to` The optimum temperature range for enzymatic activity is 298-310 K. Human body temperature being 310 K is suited for enzyme catalysed reactions. `to` The rate of an enzyme -catalysed reaction is maximum at a particular pH called optimum pH, which lies between 5-7. |
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| 1141. |
Give the order of coagulating power of `Cl, SO_(4)^(2-), PO_(4)^(3-)` in the coagulation of positive sols. |
| Answer» `to` The order of coagulating ability of given ions with positive sols is `PO_(4)^(-3) gt SO_(4)^(-2) gt Cl^(-)`. | |
| 1142. |
Which is not the characteristic of hydrophobic sols? a. They are highly susceptible to coagulation by addition of electrolytes. b. They have nearly the same surface tension and viscosity as that of dispersion medium. c. Their stability is due to both electric charge and salvation of the particles. d. Sol particles can be seen under ultramicroscope. |
| Answer» The stability is attributed to electric charge on the sol particles. The stability is attributed to electric charge on the sol particles. | |
| 1143. |
The colloidal system consisting of a liquid adsorbete in a solid adsorbent is termed as:A. AerosolB. SolC. FoamD. Gel |
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Answer» Correct Answer - B n |
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| 1144. |
Assertion: `NH_(3)` absorbs more readily over activted charcoal than `CO_(2)` Reason: `NH_(3)` is non-polar.A. if both assertion and reason are true and the reason is the correct explanation of the assertion.B. if both assertion and reson are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If the assertion and reason both are false. |
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Answer» Correct Answer - C `NH_(3)` absorbs more readily over activated charcoal than `CO_(2)` it is correct. The reason is the polar nature of `NH_(3)` due to which it readily absorb. Hence assertion is true but reason is false. |
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| 1145. |
Assertion: For the coagulation of sols carrying positive charge, `PO_(4)^(3-)` ions are more effeciency than `SO_(4)^(2-)` or `Cl^(-)` ions. Reason: This follows Hardy-Schulze rule.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true and the reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true. |
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Answer» Correct Answer - A Both assertion and reason are ture and reason is the correct explanation of assertion.According to Hardy-Schulze rule: coagulating power of an electrolyte is directly proportional to the fourth powre of the valency of the ions causing coagulation. |
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| 1146. |
The capacity to bring about coagulation increases withA. Ionic radiiB. Atomic radiiC. Valency of an ionD. Size of an ion |
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Answer» Correct Answer - C The amountof electrolyte required to coagulated a fixed amount of a sol depends upon the valency of flocculating ion. |
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| 1147. |
Assertion: Physical absorption of molecular takes place on surface only. Reason: In this process, the bonds of the absorbed molecules are not broken.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true and the reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true. |
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Answer» Correct Answer - D The assertion that physical absorption of molecules takes place on surface only is false. Actually, absorption takes place on the whole body. In physical absorption the bonds of absorption molecules are not broken. |
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| 1148. |
Assertion: Physical absorption of molecular takes place on surface only. Reason: In this process, the bonds of the absorbed molecules are not broken.A. if both assertion and reason are true and the reason is the correct explanation of the assertion.B. if both assertion and reson are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If the assertion and reason both are false. |
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Answer» Correct Answer - D The assertion that physical absorption of molecules takes place on surface only is false. Actually absorption takes place on the whole body. In physical absorption the bonds of absorption molecles are not broken. Hence, both assertion and reason are false. |
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| 1149. |
which of the following does not contain a hydrophobic structures.A. Linseed oilB. LanolinC. GlycogenD. Rubber |
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Answer» Correct Answer - D Linsed oil, lanllin and glycogen attract water hence contain a hydrophobic dstructure. But rubber does not attract water and does not contain a hydrophobic structure. |
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| 1150. |
Point out the false statementA. Brownian moventment and Tyndall effect is shown by colloidal systemB. Gold number is a measure of the protective power of a lyophilic colloid.C. The colloidal solution of a liquid in liquid is celled is gelD. Hardy-Schulze rule is related with coagulation |
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Answer» Correct Answer - C The colloidal sloution of liquid in liquid is called emulsion not gel . |
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