InterviewSolution
Saved Bookmarks
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.
| 401. |
The coagulation of `200 mL` of a positive colloid took place when `0.73 g HCl` was added to it without changing the volume much. The flocculation value of `HCl` for the colloid is a. `36.5` , b. `100` , c. `200` , d. `150` |
|
Answer» `200mL` of the sol requires `0.73gHCl` Moles of `HCl=(0.73)/(36.5)mol=0.02mol=20.0mmol` Therefore, `1000mL(1L)` of the sol will require `=(20)/(200)xx1000=100m mol` `200mL` of the sol requires `0.73gHCl` Moles of `HCl=(0.73)/(36.5)mol=0.02mol=20.0mmol` Therefore, `1000mL(1L)` of the sol will require `=(20)/(200)xx1000=100m mol` |
|
| 402. |
Which of following statement is incorrect?A. On peolonged dialysis colliods becomes stableB. `AgNO_(3)` in excess `Kl` forms negative colloidC. `AgNO_(3)` in excess `Kl` forms positive colloidD. Medicines work best in colloidal form because of greater surface area |
|
Answer» Correct Answer - B Mixing `AgNO_(3)` in excess `Kl` forms negatively charged colloid. |
|
| 403. |
Hydrolysis of ethyl acetate is catalysed by aqueous:-A. `Na_(2)SO_(4)`B. `K_(2)SO_(4)`C. `H_(2)SO_(4)`D. `BaSO_(4)` |
|
Answer» Correct Answer - C `CH_(3)C O OC_(2)H_(5)+HOHunderset("Catalyst")overset(Conc." "H_(2)SO_(4))toCH_(2)CO OH+C_(2)H_(5)OH` |
|
| 404. |
The coagulation of `200 mL` of a positive colloid took place when `0.73 g HCl` was added to it without changing the volume much. The flocculation value of `HCl` for the colloid is a. `36.5` , b. `100` , c. `200` , d. `150`A. `100`B. `36.5`C. `0.365`D. `150` |
|
Answer» Correct Answer - A Flocculation value is minimum millimoles of electrolyte to be added to one litre of colloidal solution to cause its coagulation `m_(HCl)= (0.73g)/(36gmol^(-1)) = 0.02mol es` `=0.02xx10^(3)m mol es = 20 m mol es`. `0.2L` of colloidal solution is ppt by `20m` moles. `1L` of colloidal solution is ppt `= (20)/(0.2L) = 100` milli moles. |
|
| 405. |
Hydrolysis of ethyl acetate is catalysed by aqueousA. `Na_(2)SO_(4)`B. `K_(2)SO_(4)`C. `H_(2)SO_(4)`D. `BaSO_(4)` |
|
Answer» Correct Answer - C `CH_(3)COOC_(2)H_(5)+HOH underset(Catelyst)overset(Conc.H_(2)SO_(4))(rarr)CH_(3)COOH+C_(2)H_(5)OH` |
|
| 406. |
A catalyst is a substance whichA. accelerates the rate of reactionB. does not influence the rate of reactionC. changes the equilibrium positionD. does not alter the energy of activation of the reaction |
| Answer» Correct Answer - A | |
| 407. |
A catalyst is a substance whichA. Alters the equilibrium in a reactionB. is always in the same phases as the reactantsC. participates in the reaction and provides easier pathways for the sameD. does not participate in the reaction but speed it up |
|
Answer» Correct Answer - D A catayst does not take part in the reaction but can speed it up. It can be recovered after the reaction. |
|
| 408. |
Effective electrolyte to cause the flocculation of a negatively charged arsenium sulphide colloid is :A. `NaCl`B. `BaCl_(2)`C. `K_(3)Fe(CN)_(6)`D. `AlCl_(3)` |
| Answer» Correct Answer - D | |
| 409. |
In the reversible reaction a catalyst is the substance whichA. increases the rate of the forward reactionB. Decreases the value of enthalpy change in the reactionC. Reduces the time required for reaching the equilibrium state in the reaction.D. Decreases the rate of the reverse reaction. |
|
Answer» Correct Answer - C In the reversible reaction a catalyst is the substance which reduces the time required for reaching the equilibrium state in the reaction. |
|
| 410. |
Which is not shown by shols :-A. AdsorptionB. Tyndall effectC. FlocculationD. Paramagnetism |
| Answer» Correct Answer - D | |
| 411. |
A catalyst is a substance that :A. undergoes chemical change to accelerate the rate of the reactionB. decreases the energy of activation of the reactionC. increases the kinetic energy of the reactionD. lowers the potential energy of the products with respect to that of the reactants. |
| Answer» Correct Answer - B | |
| 412. |
Which of the following options are correct?A. Micelle formation by soap in aqueous solution is possible at all temperaturesB. Micelle formation by soap in aqueous solution occurs above a particular concentrationC. On dilution of soap solution micelles may revert to individual ionsD. Soap solution behaves as a normal strong electrolyte at all concentrations |
|
Answer» Correct Answer - B::C Micelle formation Some substances at low concentration behaves as a normal electrolytes but at higher concentration exhibit colloidal behaviour due to formation of micelles. CMC (Critical Micelle Concentration ) The concentration above which it behaves as a micelle known as critical micelle concentration (CMC). e.g., soap solution in aqueous solution above particular concentration (called CMC `=10^(-4)-10^(3) moL^(-1)`) forms soap micelles. On dilution soap solution behaves as a normal electrolyte and after adding excess of water intermolecular force of attraction between the soap particles decreases and soap solution micelles may revert to individual ions. |
|
| 413. |
Which of the following reaction parameters will change due to addition of a catalyst ?A. Free energyB. Only equilibrium constantC. Only rate constantD. Both equilibrium constant and rate constant |
| Answer» Correct Answer - C | |
| 414. |
Detergent action of synthesis detergents is due to their.A. Interfacial areaB. High molecular weightC. IonisationD. Emulsifying properties |
| Answer» Correct Answer - D | |
| 415. |
Which of the following phenomenon is applicable to the process shown in the figure ? A. absorptionB. AdsorptionC. CoagulationD. Emulisification |
|
Answer» Correct Answer - B Aqueous solution of raw sugar, when passed over beds of animal charcoal , becomes colourless as the colouring substances are absorbed by the charcoal. |
|
| 416. |
In electrophoresis,A. the colloidal particles migrate in an applied electric field.B. the medium migrates in applied electric fieldC. both colloidal particles and the medium migrate.D. neither the particles not the medium migrate. |
| Answer» Correct Answer - A | |
| 417. |
Gelatin protects :-A. Gold solB. `As_(2)S_(3)` solC. `Fe(OH)_(3)` solD. All |
| Answer» Correct Answer - D | |
| 418. |
In electrophoresis :-A. Sol particles move towards opposite electrodesB. Medium moves towards opposite electrodesC. Neither (1) & (2)D. Both (1) & (2) |
| Answer» Correct Answer - A | |
| 419. |
Which of the following process is responsible for the formation of delta at a place where rivers meet the sea?A. EmulsificationB. Colloid formationC. CoagulationD. peptisation |
|
Answer» Correct Answer - C The process of accumulation of colloidal partilces together to get the size which ultimately settles as a precipitate is called coagulation. It generally occurs in presence of an electrolyte . Coagulation of soil particles of river in presence of salts present in sea water is responsible for the formation of delta. |
|
| 420. |
Which of the following process is not responsible for the presence of electric charge on the sol particles?A. Electron capture by sol particlesB. Adsorption of ionic species from solutionC. Formation of Helmholtz electrical double layerD. Absorption of ionic species from solution. |
|
Answer» Correct Answer - D The sol particles acquire positive or negative charge by preferential adsorption of positive in sea water is responsible for the formation of delta. |
|
| 421. |
The coagulating power of an effective ion carrying the charge opposite to the sol particles has been illustrated by :-A. Brownian movementB. Gold noC. Tyndall effectD. Schulze hardy rule |
| Answer» Correct Answer - D | |
| 422. |
Which one of the following is not applicable to the phenomenon of adsorption?A. `Delta H gt 0`B. `DeltaG gt 0`C. `DeltaS lt 0`D. `DeltaH lt 0` |
|
Answer» Correct Answer - A Adsorption is an exothermic process hence, `DeltaH gt 0` |
|
| 423. |
Which of the following process is not responsible for the presence of electric charge on the sol particles?A. Electron capture by sol particlesB. Adsorption of ionic species from solutionC. Formation of Helmholtz electrical double layerD. Absorption of ionic species from solution |
|
Answer» Correct Answer - D Absorption of ionic species from solution is not responsible for the presence of the presence of electric charge on the sol particles. Charge on the sol particles is due to (i) electrons capture by sol particles during electro despersion of metal. (ii) preferential adsorption of ionic species from solution . (iii) formation of Helmholtz electrical double layer. |
|
| 424. |
Which of the following phenomenon is applicable to the process shown in the figure? A. AbsorptionB. AdsorptionC. CoagulationD. Emulsification |
|
Answer» Correct Answer - B Above figure represent adsorption of yellowish brown colour of raw sugar by animal charcoal. Here, aqueous solution of raw sugar is filtered by using animal charcoal. Yellowish brown colour of raw sugar is adsorbed and filterate is colourless which gives white colour on cystallisation. Hence, this phenomenon is adsorption. |
|
| 425. |
For soaps critical micelle concentration (CMC) is `10^(-x)` (min) to `10^(-gamma)` (max.) mol/L what is the value of x? |
|
Answer» Correct Answer - 4 |
|
| 426. |
In the given isotherm select the incorrect statement? A. `x//m prop P^(1//n)` along `OA`B. `x//m prop P^(@)` when ppoint `B` reachedC. `x//m` does not increase as rapidly with pressure along `BC` due to less surface area available for adsorptionD. Nature of isotherm is different for two gases for same adsorbent. |
| Answer» Correct Answer - 2 | |
| 427. |
At STP the volume of nitrogen gas required to cover a sample of silica gas, assuming larngmulr monolayer adsorption is found to be `1.30 gcm^(-2) g^(-1)` of the gel. The area occupied by a nitrogen molecule is `0.16nm^(2)`. What is the surface area per gram of silica gel ?A. `5.568m^(2)g^(-1)`B. `3.48m^(2)g^(-1)`C. `1.6m^(2)g^(-1)`D. None of these |
|
Answer» Correct Answer - 1 No. of molecule per gm of `N_(2)` in monolayer `=(6xx10^(23))/(22400)xx1.30=3.48xx10^(19)` area of a molecule `=1.6xx10^(19)m^(2)` `:." "` Area covered by molecule per gram`=3.48xx10^(19)xx1.6xx10^(-19)=5.568m^(2)` `:. " "`Surface are `=5.568m^(2)g^(-1)` |
|
| 428. |
Volume of `N_(2)` at 1 atm, 273 K required to form a monolayer on the surface of iron catalyst is `8.15ml//gm` of the adsorbent. What will be the surface area of the adsorbent per gram if each nitrogen molecule occupies `16 xx 10^(-22)m^(2)`? [Take : `N_(A)=6xx10^(23)`]A. `16 xx 10^(-16)cm^(2)`B. `0.35 m^(2)//g`C. `39 m^(2)//g`D. `22400 cm^(2)` |
| Answer» Correct Answer - B | |
| 429. |
Volume of `N_(2)` at 1 atm, 273 K required to form a monolayer on the surface of iron catalyst is `8.15ml//gm` of the adsorbent. What will be the surface area of the adsorbent per gram if each nitrogen molecule occupies `16 xx 10^(-22)m^(2)`? [Take : `N_(A)=6xx10^(23)`]A. `16xx10^(-16)cm^(2)`B. `0.35m^(2)//g`C. `39m^(2)//g`D. `22400cm^(2)` |
|
Answer» Correct Answer - B |
|
| 430. |
If adsorption of a gas on a solid is limited to monolayer formatin , then which of the following statement are ture ?A. At low pressures `x/m` varioes proportionately with PB. At moderate pressures, `x/m` varies less than proportiontely with PC. At high pressure ,` x/m` becomes inderpendent of PD. at high pressue , `x/m` varies more than proportiontely with P |
|
Answer» Correct Answer - a,c,d |
|
| 431. |
each question constain STATEMENT-1(Assertion ) and STATEMENT - 2 (reason). examine the statement carefully and each question constain STATEMENT-1(Assertion ) and STATEMENT - 2 (reason). examine the statement carefully and work the correct answer accoridng to the instructions given below : STATEMENT-1: Sky appears blue in colour. STATEMENT-2: Colloidal particles of dust along with water suspended in air scatter blue light.A. if both the statement are TRUE and STATEMENT -2 is the correct explanation of STATEMENT - 1B. If both the statement are STATEMENT -2 is NOT the correct explanation of STATEMENT -1C. If STATEMENT -1 is TRUE and STATEMENT is FALSED. If STATEMENT -1 is FALSE and STATEMENT -2 is TRUE |
|
Answer» Correct Answer - A |
|
| 432. |
each question constain STATEMENT-1(Assertion ) and STATEMENT - 2 (reason). examine the statement carefully and work the correct answer accoridng to the instructions given below :STATEMENT-1: The conversion of fresh precipitate to colloidal state is called peptization. STATEMENT-2: It is caused by addition of common ions.A. if both the statement are TRUE and STATEMENT -2 is the correct explanation of STATEMENT - 1B. If both the statement are STATEMENT -2 is NOT the correct explanation of STATEMENT -1C. If STATEMENT -1 is TRUE and STATEMENT is FALSED. If STATEMENT -1 is FALSE and STATEMENT -2 is TRUE |
|
Answer» Correct Answer - B |
|
| 433. |
each question constain STATEMENT-1(Assertion ) and STATEMENT - 2 (reason). examine the statement carefully and work the correct answer accoridng to the instructions given below : STATEMENT-1: A catalyst is more effective in finely divided form. STATENENT-2: Finely divided form has more surface area.A. if both the statement are TRUE and STATEMENT -2 is the correct explanation of STATEMENT - 1B. If both the statement are STATEMENT -2 is NOT the correct explanation of STATEMENT -1C. If STATEMENT -1 is TRUE and STATEMENT is FALSED. If STATEMENT -1 is FALSE and STATEMENT -2 is TRUE |
|
Answer» Correct Answer - A |
|
| 434. |
each question constain STATEMENT-1(Assertion ) and STATEMENT - 2 (reason). examine the statement carefully and work the correct answer accoridng to the instructions given below :STATEMENT-1: Lyophilic colloids are called as reversible sols. STATEMENT-2: Lyophilic sols are extensively hydrated.A. if both the statement are TRUE and STATEMENT -2 is the correct explanation of STATEMENT - 1B. If both the statement are STATEMENT -2 is NOT the correct explanation of STATEMENT -1C. If STATEMENT -1 is TRUE and STATEMENT is FALSED. If STATEMENT -1 is FALSE and STATEMENT -2 is TRUE |
|
Answer» Correct Answer - B |
|
| 435. |
Gold number of starch is 25. How much of it is required to prevent coagulation of 100 ml of gold sol adding 1 ml of `10% NaCl` solution?A. 25 mgB. 250 mgC. `2.5 mg`D. `0.250 mg` |
| Answer» Correct Answer - B | |
| 436. |
each question constain STATEMENT-1(Assertion ) and STATEMENT - 2 (reason). examine the statement carefully and work the correct answer accoridng to the instructions given below :STATEMENT-1: ZSM-5 is a type of zeolites used as a catalyst in petrochemical industries. STATEMENT-2: Zeolites are microporous aluminusilicates three dimensional network silicates in which some silicon atoms are replaced by aluminium atoms.A. if both the statement are TRUE and STATEMENT -2 is the correct explanation of STATEMENT - 1B. If both the statement are STATEMENT -2 is NOT the correct explanation of STATEMENT -1C. If STATEMENT -1 is TRUE and STATEMENT is FALSED. If STATEMENT -1 is FALSE and STATEMENT -2 is TRUE |
|
Answer» Correct Answer - B |
|
| 437. |
Silica gel is commonly used as :A. if both the statement are TRUE and STATEMENT -2 is the correct explanation of STATEMENT - 1B. If both the statement are STATEMENT -2 is NOT the correct explanation of STATEMENT -1C. If STATEMENT -1 is TRUE and STATEMENT is FALSED. If STATEMENT -1 is FALSE and STATEMENT -2 is TRUE |
|
Answer» Correct Answer - A |
|
| 438. |
Which one is an example of gelA. SoapB. CheeseC. MilkD. Fog |
| Answer» Correct Answer - B | |
| 439. |
Which of the following is/are coorectly matched?A. Butter-gelB. Milk-emulsionC. Fog-aerosolD. Dust-solid sol |
|
Answer» Correct Answer - A::B::C Dust is an aerosol and not a solid sol. Correct Answer - A::B::C Dust is an aerosol and not a solid sol. |
|
| 440. |
Which of the following is/are elastic gel?A. SilicaB. AluminaC. GelatinD. Ferric oxide |
|
Answer» Correct Answer - C Partial dehydration of an elastic gel, of which gelatin gel is a good example, leads to the formation of an elastic solid from which the original sol may be readily regenerated by the addition of water and warming if necessary. |
|
| 441. |
Which is incorrectly matched?A. Anionic surfactant `- C_(17)H_(35)COONa`B. Cationic surfactant C. Erionite `-Na_(2)K_(2)CaMg(AlO_(2))_(2)(SiO_(2))_(2)6H_(2)O`D. None of these |
| Answer» Correct Answer - D | |
| 442. |
Which of the following statements is/are not correct ?A. A catalyst always increases the speed of a reaction.B. A catalyst does not take part in the reaction.C. A catalyst may affect the nature of the products formed.D. A catalyst is always an external substance added to the reaction mixture. |
|
Answer» Correct Answer - A::B::D A catalyst is a substance that may increase or decreases the speed of reaction, also it may be added from outside and sometimes may produced during the reaction. Correct Answer - A::B::D A catalyst is a substance that may increase or decreases the speed of reaction, also it may be added from outside and sometimes may produced during the reaction. |
|
| 443. |
Assertion : A catalyst lowers the threshold energy level for a reaction Reason : A catalyst combines with one of the reactans of from an intermediate the follows an alternate path with lesser energy of activation.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. |
|
Answer» Correct Answer - A Reason is the correct explanation for assertion. |
|
| 444. |
Which of the following is wrong ?A. Boundary separating two bulk phase is also known as surface of interface.B. Interface is represented by separating the bulk phases by a hyphen or a slash.C. There is no interface between gasesD. The bulk phases are always pure compounds. |
|
Answer» Correct Answer - A The bulk phaese may be pure elements, compounds or solution |
|
| 445. |
An example of an associated colloid is:-A. MilkB. Soap solutionC. Rubber latexD. Vegetable oil |
| Answer» Correct Answer - B | |
| 446. |
Give an example of an associated colloid? |
| Answer» Soaps and detergents are associated colloids. Soaps and detergents are associated colloids. | |
| 447. |
Give one example of positively charged sol and one example of negatively charged sol. |
| Answer» `Fe(OH)_(3)` is a positively charged sol whereas `As_(2)S_(3)` is a negatively charged sol. `Fe(OH)_(3)` is a positively charged sol whereas `As_(2)S_(3)` is a negatively charged sol. | |
| 448. |
Why do collidal solutions exhibit Tyndall effect? |
| Answer» Colloidal solutions exhibit Tyndall effect because the size of the colloidal particles `(10-100A)` is such that they can scatter light. Colloidal solutions exhibit Tyndall effect because the size of the colloidal particles `(10-100A)` is such that they can scatter light. | |
| 449. |
Which of the following is correct for lyophilic sol ?A. irreversible natureB. formed from inorganic substancesC. readily coagulated by the addition of electrolyteD. self-stabilised. |
|
Answer» Correct Answer - D is the correct answer. |
|
| 450. |
Catalyst used in the oxidation of `SO_(2) rarr SO_(3)`A. NickelB. `ZnO.Cr_(2)O_(3)`C. `V_(2)O_(5)`D. Iron |
|
Answer» Correct Answer - C `2SO_(2)+O_(2)underset(("Catalyst"))overset(V_(2)O_(5))to2SO_(3)`. |
|