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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.
| 201. |
Which adsorption takes place at low temperature? |
| Answer» Correct Answer - Physisorption | |
| 202. |
There are certain properties related to adsorption I. reversible II. Formation of unimolecular layer III. , low heat of adsorption IV., occurs at low temperature and decreases with increasing temperature Which of the above properties are for physical adsorption ?A. I , II and IIIB. I , III and IVC. II , III and IVD. II , IV and III |
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Answer» Correct Answer - B Physical adsorption is reversible , have low heat of adsorption and occurs at low temperature . It decreases with increasing temperature , it forms the multimolecular layer |
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| 203. |
At high pressure ,Langmuir adsorption isotherm takes the form :A. `(x)/(m)=(ap)/(1+bp)`B. `(x)/(m)=(a)/(b)`C. `(x)/(m)=ap`D. `(m)/(x)=(b)/(a)+(1)/(ap)` |
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Answer» Correct Answer - B Langmuir adsorption isotherm is `(x)/(m)=(ap)/(1+bp)` At high pressure, `1+bp=bp` or `(x)/(m)=(ap)/(bp)=(a)/(b)` |
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| 204. |
For Langmuir adsorption isotherm, which is correct?A. B. C. D. None of these |
| Answer» Correct Answer - D | |
| 205. |
The effect of pressure on adsorption is high if a. Temperature is low b. Temperature is highc. Temperature is neither very low nor very highA. temperture is lowB. temperature is highC. temperature is very highD. larger charcol piece is taken |
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Answer» Correct Answer - a |
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| 206. |
According to Langmuir adsorption isotherm, the amount of gas adosobed at very high pressureA. Reaches a constant limiting valueB. Goes on increasing with pressureC. Goes on decreasing with pressureD. Increase first and decreaseing later with pressure |
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Answer» Correct Answer - A According to Langmuir adsorption isotherm the amount of gas adsorbed at very high pressure reaches a constant limiting volume. |
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| 207. |
According to Langmuir adsorption isotherm, the amount of gas adosobed at very high pressureA. reachaes a constant limiting valueB. goes on increasing with pressureC. goes on increasing with pressureD. increases first and decrrease later with pressure |
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Answer» Correct Answer - A Langmuir adsorption isotherm deals in terms of chemical adsorption which fails at high pressure because the mas adsorbed reaches a constant value when the adsorbed suface is completely covered by a unimolecular layer of gases . |
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| 208. |
According to Langmuir adsorption isotherm, the amount of gas adosobed at very high pressureA. Reaches a constant limiting valueB. Goes on increasing wiith pressureC. Goes on decreasing with pressureD. Increases first and decreases later with pressure |
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Answer» Correct Answer - A According to Langmuir Adsorption isotherm the amount of gas adsorbed at very high pressures reaches a constant limiting volume. |
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| 209. |
How does chemical adsorption of a gas on the surface of a solid very with temperature ?A. OneB. TwoC. MultiD. Zero |
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Answer» Correct Answer - A In chemical adsorption, one layer is adsorbed. |
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| 210. |
In multimolecular colloidal soluions , atoms or molecules are held togethuer by :A. H-bondingB. van der Waals forcesC. ionic bondingD. covalent bonding |
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Answer» Correct Answer - B ` ---------do--------------` |
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| 211. |
Which of the following is contributed towards the extra stability of lyophilic colloids?A. HydrationB. ChargeC. ColourD. Tyndal effect |
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Answer» Correct Answer - A Lyophilic means liquid loving hence hydration is contributed towards the extra stability of lyophilic colloids. |
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| 212. |
the stability of lyophilic colloids is due toA. Charge on their particlesB. Large size of their particlesC. Small size of their particlesD. Solvation by dispersion medium |
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Answer» Correct Answer - D |
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| 213. |
which of the following represents a multimolecular colloidal paricles?A. Solution of goldB. CelluloseC. SoapsD. Synthetic detergents |
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Answer» Correct Answer - B Cellulose is macromolecular colloid. |
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| 214. |
Which of the following is contributed towards the extra stability of lyophilic colloids?A. hydrationB. chargeC. colourD. tyndall effect |
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Answer» Correct Answer - A Lyophilic means liquid loving hence hydration is contributed towards the extra stability of lyophilic colloids. |
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| 215. |
`As_2S_3` sol has a negative charge. Capacity to precipitate it is highest inA. `AlCl_(3)`B. `Na_(3)PO_(4)`C. `CaCl_(2)`D. `K_(2)SO_(4)` |
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Answer» Correct Answer - A Negatively charged `As_(2)S_(3)` sol is coagulated most effectively by `AlCl_(3)`. This is because oppositely charged `Al^(+++)` ions have maximum charge. `Al^(3+) gt Ca^(2+) gt Na^(+)` |
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| 216. |
`As_2S_3` sol is aA. Positive colloidB. negative colloidC. neutral colloidD. none of these |
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Answer» Correct Answer - B As_(2) S_(3)` sol. Is negative colloid because this sol. May be partically or completely precipiatated. |
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| 217. |
The negative charge on ` As_2S_3` sol is due to adsorption of :A. `H^-`B. `OH^-`C. `O^(2-)`D. `S^(2-)` |
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Answer» Correct Answer - D ` As_2 S_3` sol particles adsorb common ion ` (s^(2-))` on them to acqure negative charge . |
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| 218. |
Assertion : A colloidal sol of `Al(OH)_(3)` is more readly coagulated by 0.1 M NaCl than by `0.1M Na_(2)SO_(4).` Reason : The coagulating power of an electrolyte is related to the concentration of the active ions.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 - D Correct assertion. A colloidal sol of `Al(OH)_(3)` is more readily coagulated by 0.1 M `Na_(2)SO_(4)` then by 0.1 M NaCl solution. Correct reason. Cogulating power of an electrolyte is related to concentration as well as charge on the active ions. |
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| 219. |
Statements : Enzymes are protenisns and enrzyme catalyused reactions re called biolgical catalysis . Explanations : The activity of enzyme as catalyst is increased in presence of vitamins .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 - D Both are different facts but treue. |
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| 220. |
Statements : Oxidation of ` Na_2SO_3` is not cauysed by air but in presence of ` Na_3 AsO-_3` both undego oxidation simultaneously . Explanations : Neither ` NaSO_3` nor ` Na_3AO_3` is oxidised by air.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 - A It is called induced oxidation. |
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| 221. |
Statements : ` Fe^(3+)` ions can be used for the coagulation of ` As_2 S_3` so. Explanations : `Fe^(3+) ` ions react with ` As_2S_3` to give ` Fe_2S_3`.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 - A Statement is correct but explanation is wrong . |
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| 222. |
For the just coagultion of 250 mL of `Fe(OH)_(3)` sol, 2 mL of `1 M Na_(2)SO_(4)` electrolyte is required. What is the coagulating value of `Na_(2)SO_(4)` electrolyte. |
| Answer» Correct Answer - `8` | |
| 223. |
Statements : Thermal decomposition of `KClO_(3(s))` in presence of `MnO_(2(s))` is an exaple of homgenous catalysis. Explanations : A homogenerous catlyasi involves phase ` P=1`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 - B Heterogeneous systems has `P ge 2` `S+S` has ` P=2` |
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| 224. |
Statements : The activity of catalyst is more or less specific. Explanations : A catalyst for one reaction is not necessary to catlyse the other reaction .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 - D …..do…. |
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| 225. |
Statements : Zeolites are water softener as well as catlyst . Explanations : The catalytic atction of zeolites is based uupon their shape seclectity .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 - D ………do…….. |
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| 226. |
Statements : The effectivenss of catlyst has found more applications is solid catlyst and gaseous reactant systems . Explanations : A large number of industrial rpeparation are based on this type fo reaction .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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| 227. |
The minimum concetration of the electrolyte required to cause coagurlation of a sol is called :A. preciptiation powerB. flocculation valueC. coagulation powerD. gold number |
| Answer» Correct Answer - B | |
| 228. |
The activity and selectivlty of zeroites as catlyst is besed on :A. their pore sizeB. size of their cavities on the surfaceC. Both a and bD. none of these |
| Answer» Correct Answer - C | |
| 229. |
Raeaction of zeolite catalyst depend upon :A. poresB. aperturesC. size of cavitesD. pressure. |
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Answer» Correct Answer - A::B::D are correct answers |
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| 230. |
Combination of `N_(2)` and `H_(2)` in the presence of `Fe` as a catalyst is an example of heterogeneous catalysis. |
| Answer» Correct Answer - T | |
| 231. |
Identify the correct order of steps in heterogeneous catalysis. (i) Adsorption of reactant molecules on the surface of the catalyst. (ii) Diffusion of reactant to the surface of the catalyst. (iii) Formation of reactions product on the catalyst surface. (iv) Diffusion of reactions product from the catalyst surface. (v) Formation of activated intermediate.A. (i), (ii), (iii), (iv), (v)B. (ii), (i), (iii), (iv), (v)C. (iii), (i), (ii), (iv), (v)D. (iii), (i), (ii), (v), (iv) |
| Answer» Correct Answer - D | |
| 232. |
According to Hardy Schultz rule, correct order of flocculation value for `Fe(OH)_3` sol is :A. Adsorption of hydroxyl ionB. Adsorption of hydrogen ionC. Adsorption of ferric aciidD. Adsorption of ferric ion |
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Answer» Correct Answer - D `FeCl_(3)` is added to excess ht water, a positively charged sol of ferric hydroxide is formed due to adsorption of `Fe^(3+)` ions. `underset("Positvely charged")(Fe(OH)_(3)//Fe^(3+)` |
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| 233. |
Which is incorrect for cleansing action of soaps?A. Soap molecules form micelleB. Hydrophilic part of stearate projects outward of dropletC. Soap helps in emulsificationD. Negatively charged sheath form aggregates |
| Answer» Correct Answer - D | |
| 234. |
When `O_(2)` is adsorbed on a metallic surface, electron transfer occurs form the metal to `O_(2).` The true statement (s) regardign this adsorption is (are)A. `O_(2)` is physisorbedB. heat is releasedC. occupancy of `"^(**)pi_(2p)"of"O_(2)` is increasedD. bond length of `O_(2)` is increases. |
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Answer» Correct Answer - B::C::D Since electron transfer has taken place from metal atom to `O_(2),` it is an example of chemisorption. Therefore, heat energy is releases (exothermic process) Option (b) is correct. The last occcupied orbital in `O_(2)` molecules is `pi_(2p)^(**)` The electron transfer is expected in the antibonding M.O. Therefore occupancy of `pi_(2y)^(**)` orbital decreases the bond order. As a result, bond length of `O_(2)` is increased. Option (d) is also correct. Option (a) is is not correct since `O_(2)` is chemisorbed. |
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| 235. |
Graph between log `((x)/(m))` and log p is a straight line at an angle `45^(@)` with intercept on y-axis 0.3010. Calculate the amount of gas adsorbed in gram per gram of the adsorbent when pressure is 0.2 atmA. `0.4`B. `0.6`C. `0.8`D. `0.2` |
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Answer» Correct Answer - A `"log"(X)/(M)="log K"+(1)/(n)"log P"` `Y = C + MX` intercept (c ) = 0.30 log K = 0.30 `K = 10^(0.3)=2` `(1)/(n)=tan 45 = 1` `(1)/(n)=1` `"log"(X)/(M)=0.30+1xx log 0.2` `0.30-0.70=-0.40` `(X)/(M)=10^(-0.40)=10^(-1)xx10^(0.60)=4xx10^(-1)=0.4` |
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| 236. |
The given graphs//data ` I, II, II` and ` IV` pepresent general terends obseved of diffent physiorpton and chemisorption processes under mild conditions of temperature and pressure , which of the following choice (s) about `I,II,II ` an` IV` is (are) correcty ? .A. I is physisorption and II is chemisorptionB. I is physisorption and III is chemisorptionC. IV is physisorption and II is chemisorptionD. IV is physisorption and III is chemisorption. |
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Answer» Correct Answer - A::D Adsorption of the same type of ions on the surface of the colloidal particles causes repulsion in the ions and thus stabilise the colloid. Therefore (a) is correct option. The potential difference between fixed and diffused layers of oppositely charges is responsible for the s yability of colloid. |
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| 237. |
The given graphs//data ` I, II, II` and ` IV` pepresent general terends obseved of diffent physiorpton and chemisorption processes under mild conditions of temperature and pressure , which of the following choice (s) about `I,II,II ` an` IV` is (are) correcty ? .A. I. is phusisorption and II is chemisorption .B. I is phusisroption and III is chemisorption.C. IV is chemisroption and II is chemisorption.D. Iv is chemisroption and III is chemisroption . |
| Answer» Correct Answer - a,c | |
| 238. |
Which will be adsorbed more readily on the surface of charcoal and why`-NH_(3)` or `CO_(2)`? |
| Answer» `NH_(3)` has higher critical temperature than `CO_(2)` , i.e., `NH_(3)` is more liquefiable than `CO_(2)` , Hence, `NH_(3)` has greater intermolecular forces of attraction and hence will be adsorbed more readily. `NH_(3)` has higher critical temperature than `CO_(2)` , i.e., `NH_(3)` is more liquefiable than `CO_(2)` , Hence, `NH_(3)` has greater intermolecular forces of attraction and hence will be adsorbed more readily. | |
| 239. |
How a colloidal sol of arsenous sulphide is prepared ? |
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Answer» Colloidal sol of arsenous sulphide is prepared by the double decompostion of `As_(2)O_(3)` and `H_(2)S` as follows. `As_(2)O_(3) + 3H_(2)S overset("Double decomposition")to As_(2)S_(3_("(sol)")) + 3H_(2)O` |
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| 240. |
For coagulating `As_(2)S_(3)` colloidal sol, which of the following will have the lowest coagulation valueA. NaCl solutionB. KClC. `BaCl_(2)`D. `AlCl_(3)` |
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Answer» Correct Answer - D The amount of electrolyte required to coagulated a fixed amount of a solution depends upon the valency of the flocculation ion. The flocculating power of the various ions follows the following order, larger the valency lesser will be coagulating value. `Al^(3+) gt Mg^(2+) gt Na^(+)`, hence lowest coagulation value is of `AlCl_(3)`. |
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| 241. |
which of the following will have the highest coagulating power for `As_(2)S_(3)` colloid?A. `PO_(4)^(3-)`B. `SO_(4)^(2-)`C. `Al^(3+)`D. `Na^(+)` |
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Answer» Correct Answer - C Higher the coagulating power of ion due to higher valency. |
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| 242. |
When a solution of palmitic acid (Mol. Mass = 256) in benzene containing 5.12 gm of acid/lit. is dropped on water surface, the benzene evaporates and the acid forms a monolayer film. The area covered by one molecule of palmitic acid is `1.54 nm^(2)`. Assuming each molecule of palmitic acid to be a sphere, answer the question that follow. `[N_(A) = 6xx10^(23)]` What is the approx density of each molecule of palmitic acid?A. `0.3 gm//ml`B. `0.4 gm//ml`C. `0.5 gm//ml`D. `1 gm//ml` |
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Answer» Correct Answer - A |
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| 243. |
The clouds consist of charged particles of water dispersed in air. Some of them are +vely charged, other are -vely charged. When +vely charged clouds come closer they cause lightening and thundering whereas when +ve and -ve charged colloid come closer they cause heavy rain by aggregation of minute particles. It is possible to cause artificial rain by throwing electrified sand or silver iodic from an aeroplane and thus coagulating the mist hanging in air. Smoke screen is a cloud of smoke used to hide military, naval police etc. It consists of fine particles of `TiO_(2)`. AgI helps in artificial rain because :A. it helps in ionisation of waterB. it help in dispersion processC. it help in coagulationD. all of the above |
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Answer» Correct Answer - C |
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| 244. |
A solution of palmitic acid (Molar mass = 256) in Benzene contain 5.12 g of acid per litre of solution. When this solution is dropped on a water surface, the Benzene evaporates and acid forms a monolayer film of solid type. If `500 cm^(2)` are is to be covered by a monolayer, then find X, where `X = (V)/(100)`, when V is volume required of solution. The area covered by 1 molecule `= 0.2 nm^(2)`. |
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Answer» Correct Answer - `2` Let V litre of palmitic acid is required. Number of molecules ` = (5.12 V)/(256) xx 6.023 xx 10^(23) = 1.2 xx 10^(22) V` Area covered `= (1.2 xx 10^(22) V)(0.2 xx 10^(-14) cm^(2)) = 2.4 xx 10^(7) V cm^(2)` `2.4 xx 10^(7) V cm^(2) = 500 cm^(2)` `V = 0.02 cm^(3) = (2)/(100) cm^(3)` X = 2 |
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| 245. |
The clouds consist of charged particles of water dispersed in air. Some of them are +vely charged, other are -vely charged. When +vely charged clouds come closer they cause lightening and thundering whereas when +ve and -ve charged colloid come closer they cause heavy rain by aggregation of minute particles. It is possible to cause artificial rain by throwing electrified sand or silver iodic from an aeroplane and thus coagulating the mist hanging in air. Smoke screen is a cloud of smoke used to hide military, naval police etc. It consists of fine particles of `TiO_(2)`. When excess of `AgNO_(3)` is treated with KI solution, AgI forms :A. `+ve` charged solB. `-ve` charged solC. neutral solD. true sol |
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Answer» Correct Answer - A |
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| 246. |
When a solution of palmitic acid (Mol. Mass = 256) in benzene containing 5.12 gm of acid/lit. is dropped on water surface, the benzene evaporates and the acid forms a monolayer film. The area covered by one molecule of palmitic acid is `1.54 nm^(2)`. Assuming each molecule of palmitic acid to be a sphere, answer the question that follow. `[N_(A) = 6xx10^(23)]` What volume of solution must be dropped on the water surface in order to cover a surface area of `1848 cm^(2)`?A. `10^(-2) lit`.B. `10^(-5)ml`C. `10^(-2) ml`D. `10^(-4) lit`. |
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Answer» Correct Answer - C |
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| 247. |
Comprehension # 2 The clouds consist of charged particles of water dispersed in air. Some of them are +vely charged, others are -vely charged. When +vely charged clouds come closer they cause lightening and thundering whereas when +ve and -ve charged colloids come closer they cause heavy rain by aggregation of minute particles. It is possible to cause artificial rain by throwing electrified sand or silver iodide from an aeroplane and thus coagulating the mist hanging in air. Smoke screen is a cloud of smoke used to hide military, naval police etc. it consists of fine particles of `TiO_(2)`. Smoke screens consist ofA. fine particles of `TiO_(2)` dispersed in air by aeroplanesB. fine particles of Agl dispersed in air by aeroplanesC. fine particles of `Al_(2)O_(3)` dispersed in air by aeroplanesD. None of these |
| Answer» Correct Answer - A | |
| 248. |
Comprehension # 2 The clouds consist of charged particles of water dispersed in air. Some of them are +vely charged, others are -vely charged. When +vely charged clouds come closer they cause lightening and thundering whereas when +ve and -ve charged colloids come closer they cause heavy rain by aggregation of minute particles. It is possible to cause artificial rain by throwing electrified sand or silver iodide from an aeroplane and thus coagulating the mist hanging in air. Smoke screen is a cloud of smoke used to hide military, naval police etc. it consists of fine particles of `TiO_(2)`. Agl helps in artificial rain because :A. it helps in ionisation of waterB. it helps in dispersion processC. it helps in coagulationD. all of them |
| Answer» Correct Answer - C | |
| 249. |
Many lyophilic sols and few lyophobic sols when coagulated under some special conditions changes into semi rigid mass, enclosing whole amount of liquid within of liquid within itself, it is called gel and the process is called gelation. Gelatin, agar-agar, gum-Arabic can be converted into gels by cooling them under moderate concentration conditions. Hydrophobic sols like silicic acid. `Al(OH)_(3)` are prepared by double decomposition and exchanged of solvent method. Types of gel : 1. Syneresis/weeping of gel : The spontaneous liberation of liquid from a gel is called syneresis or weeping of gels. It is reverse of swelling. e.g., geletin, agar-agar show syneresis at low concentration while silicic shows it at high concentration. 2. Imbibition or swelling of gel : When gel is kept in a suitable liquid (water) it absorb large volume of liquid. The phenomenon is called imbibition or sweeling of gel. 3. Thixotropic : Some gels when shaken to form a sol, on keeping changes into gel are termed as thixotropic gel and phenomenon is called thixotropy. e.g., gelatin and silica liquify on shaking changing into corresponding sol and the sol on keeping changes back into gel. Which of the following is used to adsorb water?A. silica gelB. Calcium acetateC. Hair gelD. Chesse |
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Answer» Correct Answer - A |
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| 250. |
The coagulation value in millimoles per litre of the electrolyes used for the coagulation of `As_(2)S_(3)` are given below: I. `(NaCl)=52` , II. `(BaCl_(2))=0.69` III. `(MgSO_(4))=0.22` The correct order of their coagulating power isA. `IgtIIgtIII`B. `IIgtIgtIII`C. `IIIgtIIgtI`D. `IIIgtIgtII` |
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Answer» Correct Answer - C For electrolytes, according to hardy-schulze rule: Coagulating power `xx(1)/("Coagulation value")` Thus, the correct order is `{:(MgSO_(4),gt,BaCl_(2),gt,NaCl),((III),,(II),,(I)):}` |
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