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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.
| 1251. |
Which of the following examples demonstrate homogeneous catalysis? (P) Pt(s) catalyzing the reaction of `O_(2)(g)` with CO(g) (Q) `Cl_(2)(g)` catalyzing the decomposition of `O_(3)(g)` (R ) `H_(2)O_(2)(aq)` decomposition catalyzed by `Br_(2)(aq)`A. P onlyB. Q onlyC. P and R onlyD. Q and R only |
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Answer» Correct Answer - D |
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| 1252. |
The catalyst used in the manufacture of methanol from water gas is:-A. `V_(2)O_(5)`B. `Ni+MO`C. `ZnO+Cr_(2)O_(3)`D. `Pt+W` |
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Answer» Correct Answer - C `[CO+H_(2)]+H_(2)overset(ZnO+Cr_(2)O_(3))toCH_(3)OH`. |
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| 1253. |
Adsorption of a gas on a surface follows Freundlich adsorption isotherm. Plot of `"log " (x)/(m)` versus log P gives a straight line with slope equal to 0.5, then : (`(x)/(m)` is the mass of the gas adsorbed per gram of adsorbent)A. Adsorption is proportional to the pressure.B. Adsorption is proportional to the square root of pressure.C. Adsorption is proportional to the square of pressure.D. Adsorption is independent of pressure. |
| Answer» Correct Answer - B | |
| 1254. |
Give two examples for homogeneous catalytic reactions. |
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Answer» The following are the examples for homogeneous catalytic reactions. `2SO_(2_((g))) + O_(2_((g))) overset(NO_((g)))to 2SO_(3(g))` `underset("Sucrose")(C_(12)H_(22)O_(11_((g))) )overset(H_((l))^(+))to underset("Glucose")(C_(6)H_(12)O_(6)_(l))+underset("Fructose")(C_(6)H_(12)O_(6_(l)))` |
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| 1255. |
A possible mechanism for hydrogenation of ethylene, in presence of mercury vapour, is `C_(2)H_(2)+ H_(2) rarr C_(2) H_(2) ("overall")` Steps : `Hg + H_(2) overset(K_1)(rarr) Hg + 2H` `H + C_(2)H_(4) overset(K_(2))(rarr) C_(2)H_(2)` `C_(2)H_(2) + H_(2) overset(K_(3))(rarr)C_(2)H_(6)+H_(-)` `H+ H overset(K_(4))(rarr) H_(2)` Determine the rate of formation of `C_(2) H_(2)` in terms of rate constants and the concentrations `[Hg], [H_(2)] and [C_(2)H_(4)]` Assume that H and `C_(2)H_(5)` reach steady state concentration. |
| Answer» Correct Answer - `(d[C_(2)H_(6)])/dt = k_(2) (k_(1)/k_(2) )^(1//2) [C_(2)H_(4)][Hg]^(1//2)[H_(2)]^(1//2)` | |
| 1256. |
Suppose we have a cube of `1.00 cm` length. It is cut in all three directions, so as to produce eight cubes, each `0.50 cm` on edge length. Then suppose these `0.50` cm cubes are each subdivided into eight cubes `0.25` cm on edge length, and so on. How many of these successive subdivisions are required before the cubes are reduced in size to colloidal dimensions of `100 nm`. |
| Answer» Correct Answer - 17 | |
| 1257. |
Which of the following is used as a catalyst in the manufacture of toluene from benzene with `CH_(3)CL`?A. NiB. Anyhdrous `AlCl_(3)`C. PdD. Pt |
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Answer» Correct Answer - B `C_(6)H_(6)+CH_(3)Clunderset(AlCl_(3))overset("Anhydrous")toC_(6)H_(5)CH_(3)+HCl` |
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| 1258. |
Which a catalyst is added to a system , the :A. value of the equilibrium constant decreaseB. equilibrium concentrations are unaffectedC. rate of reaction is increasedD. activation energy of the reaction decrases |
| Answer» Correct Answer - b,c,d | |
| 1259. |
Which is (are) rue in case of catalyst ?A. A catlyst usually does not initiate a reactionB. It does not alter the positon of the equilibrium in a reversible ractionC. A catalyst remains undcharged compositon at the end if the reactionD. Catalysts are sometimes very specific in respect of a reasction |
| Answer» Correct Answer - b,d | |
| 1260. |
A plot of log (x/m) versus log p for the adsorption of a gas on the surface of a solid gives a straight line which slope equal to :A. log KB. `- log K`C. nD. `1/n` |
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Answer» Correct Answer - D Slope `=1/n` |
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| 1261. |
If a homogeneous catalytic reaction follows three alternative paths A, B and C, then which of the following indicates the relative ease with which the reaction moves? |
| Answer» Correct Answer - `C gt B gt A` | |
| 1262. |
Metals of how many groups of periodic table show macimum catalytic activity. |
| Answer» Correct Answer - Metals of groups 7 to 9 i.e. , three groups. | |
| 1263. |
Which of the following options is/are correct regarding catalytic action?A. Conversion of proteins into amino acids by hydrolysis in intestines is catalysed by enzyme pancreatic trypsin.B. In case of fever the activity of biochemical catalyst gets adversely affected.C. Catalyst cannot change the final product obtained in the reaction.D. Zeolites are shapes selective catalysts. |
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Answer» Correct Answer - A::B::D |
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| 1264. |
Write the name of groups of periodic table from which catalytic actibity of metals increases |
| Answer» Metal of group 5 to 11 | |
| 1265. |
Which catalyst is used in the preparation of `CH_(3)OH` by the reaction of `CO(g) & H_(2)(g)`? |
| Answer» `Cu//ZnO-Cr_(2)O_(3)` | |
| 1266. |
Write the name of two substances which can act as catalytic posons. |
| Answer» Arsenic and carbon monoxide (CO) | |
| 1267. |
Assertion(A): Activity of an enzyme is `pH` dependent. Reason(R): Change in `pH` affects the solution of the enzyme in water.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 - B Activity of enzyme increases with increase in `Ph` and is maximum of `pH = 7.4` and then falls off. Hence, assertion is correct. Correct explation with change in `pH` , the extent of protonation of the bases changes. |
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| 1268. |
Assertion(A): Activity of an enzyme is `pH` dependent. Reason(R): Change in `pH` affects the solution of the enzyme in water.A. If both (A) and (R) are correct, and (R) is the correct explanation of (A)B. If both (A) and (R) are correct, but (R) is the correct explanation of (A).C. If (A) is correct, but (R) is incorrect.D. If (A) is incorrect, but (R) is correct. S |
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Answer» Correct Answer - C With change in `pH` , the extent of protonation of the bases changes. |
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| 1269. |
which of the following factors affects the adsorption of a gas on solid ?A. Critical temperture `(t_(c))`B. temperature of gasC. pressure of gasD. All of these |
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Answer» Correct Answer - d |
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| 1270. |
How do size of particles of adsorbent, pressure of gas, and prenvailing temperature influence the extent of adsorption of a gas on a solid? |
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Answer» a. Smaller the size of the particles of an adsorbent greater b. At constant temperature, adsorption first increases with increase of pressure and then attains equilibrium at high pressures. c. In physical adsorption, it decreases with increase of temperature but in chemisorption, first it increase and then decreases. a. Smaller the size of the particles of an adsorbent greater b. At constant temperature, adsorption first increases with increase of pressure and then attains equilibrium at high pressures. c. In physical adsorption, it decreases with increase of temperature but in chemisorption, first it increase and then decreases. |
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| 1271. |
What role does adsorption play in heterogeneous catalysis ? |
| Answer» In heterogeneous catalysis generally the reactants are gaseous whereas catalyst is a solid. The reactant molecules are adsorbed on the surface of the solid catalyst by physical adsorption or chemisorption. As a result, the concentration of the reactant molecules on the surface increases further leading to increase in rate of reaction. Alternatively one of the reactant molecules undergoes fragmentation on the surface of the solid catalyst producing active species which react faster. The product molecules in either case have no affinity for the solid catalyst and are deadsorbed making the surface free for fresh adsorption. | |
| 1272. |
The liquid-liquid colloidal dispersions are called…………….. |
| Answer» Correct Answer - Emulsion | |
| 1273. |
Match column-I with column-II : |
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Answer» Correct Answer - A::B::C::D |
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| 1274. |
Powdered substances are more effective adsorbents than their crystalline form becauseA. crystalline form has more surface area than powdered formB. powdered form has more surface area than crystalline formC. crystalline form adsorbs in low temperature but powdered form requires high temperatureD. None of the above . |
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Answer» Correct Answer - B Powdered form has more surface area than crystalline form . And as surface area increases , extent of adsorption also increases. |
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| 1275. |
Why are powdered substance more effective as adsorbents than their crystalline forms ?A. adsorption is an exothermic processB. they become insert and do not react with the adsorbateC. the extent of adsorption increases with increases in surface area of the adsorbentD. adsorption is more if the size of adsorbent is small. |
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Answer» Correct Answer - C Finely powdered substances have largs, porous surface ares, hence act as better absorbent . |
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| 1276. |
What are the factors which influence the adsorption of a gas on a solide ? |
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Answer» The extent of adsorption of a gas on a solid depends upon the following factors: (a) Nature of the adsorbate, (b) Nature of the adsorbent, (c) Temperature and (d) Pressure. |
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| 1277. |
Assertion: All colloidal dispersions give very low ormotic pressure and show very small freezing point depression or boiling point elevation. Reason: Tyndall effect is due to scattering of light from the surface of colloidal 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 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 - B Colloidal particles have high molar mass, so their mole fraction is very less causing low colligative prooperties. |
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| 1278. |
Match column-I with column-II : |
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Answer» Correct Answer - A::B::C::D |
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| 1279. |
Assertion : In physisorption, adsorption decreases with increase in tempetrature. Reason : Lhysisorption is of eothermic nature.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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| 1280. |
Give reason why a finely divided substance is more effective as an adsorbents? |
| Answer» Finely divided substance has large surface area and hence greater adsorption. | |
| 1281. |
The colloidal particles are electrically charged as a indicated by their migration towards cathode or anode under the applied electric field. In a particular colloidal system, all particles carry either positive charge or negative charge. The electric charge on colloidal particles orginate in several ways. According to preferential adsorption theory, the freshly obtained precipitate particles adsorb ions from the dispersion medium, which are common to their lattice and acquire the charge of adsorbed ions. For example, For example, freshly obtained `Fe(OH)_(3)` precipitated is dispersed, by a little `FeCl_(3)`, into colloidal solution owing to the adsorption of `Fe^(3+)` ions in preference. Thus sol particles will be positively charged. In some cases the colloidal particles are aggregates of cations or anions having ampiphilic character. When the ions posses hydrophobic part (hydrocarbon end) as well as hydrophilic part (polar end group), they undergo association in aqueous solution to form particles having colloidal size. The formation of such particles, called micelles plays a very important role in the solubilization of water insoluble substances, (hydrocarbon, oils, fats, grease etc.). In micelles, the polar end groups are directed towards water and the hydrocarbon ends into the centre. The charge on sol particles of proteins depends on the pH. At low pH, the basic group of protein molecule is ionized (protonated) and at higher pH (alkaline medium), the acidic group is ionized. At isoelectric pH, characteristic to the protein, both basix and acidic groups are equally ionized. The stability of colloidal solution is attributed largely to the electric charge of the dispersed particles. This charge causes them to be coagulated or precipitated. On addition of small amount of electrolytes, the ions carrying oppiste charge are adsorbed by sol particles resulting in the neutralization of their charge. When the sol particles either with no charge or reduced charge, come closer due to Brownian movement, they coalesce to form bigger particles resulting in their separation from the dispersion medium. This is what is called coagulating or precipitation of the colloidal solution. The coagulating power of the effective ion, which depend on its charge, is expressed in terms of its coagulating value, defined as its minimum concentration (m mol/L) needed to precipitate a given sol. Under the influence of an electric field, the particles in a sol migrate towards cathode. The coagulation of the same sol is studied using NaCl, `Na_(2)SO_(4)` and `Na_(3)PO_(4)` solutions. Their coagulating values will be in the order :A. `NaCl gt Na_(2)SO_(4) gt Na_(3)PO_(4)`B. ` Na_(2)SO_(4) gt Na_(3)PO_(4) gt NaCl`C. ` Na_(3)PO_(4) gt Na_(2)SO_(4) gt NaCl`D. `Na_(2)SO_(4) gt NaCl gt Na_(3)PO_(4)` |
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Answer» Correct Answer - A |
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| 1282. |
The colloidal particles are electrically charged as a indicated by their migration towards cathode or anode under the applied electric field. In a particular colloidal system, all particles carry either positive charge or negative charge. The electric charge on colloidal particles orginate in several ways. According to preferential adsorption theory, the freshly obtained precipitate particles adsorb ions from the dispersion medium, which are common to their lattice and acquire the charge of adsorbed ions. For example, For example, freshly obtained `Fe(OH)_(3)` precipitated is dispersed, by a little `FeCl_(3)`, into colloidal solution owing to the adsorption of `Fe^(3+)` ions in preference. Thus sol particles will be positively charged. In some cases the colloidal particles are aggregates of cations or anions having ampiphilic character. When the ions posses hydrophobic part (hydrocarbon end) as well as hydrophilic part (polar end group), they undergo association in aqueous solution to form particles having colloidal size. The formation of such particles, called micelles plays a very important role in the solubilization of water insoluble substances, (hydrocarbon, oils, fats, grease etc.). In micelles, the polar end groups are directed towards water and the hydrocarbon ends into the centre. The charge on sol particles of proteins depends on the pH. At low pH, the basic group of protein molecule is ionized (protonated) and at higher pH (alkaline medium), the acidic group is ionized. At isoelectric pH, characteristic to the protein, both basix and acidic groups are equally ionized. The stability of colloidal solution is attributed largely to the electric charge of the dispersed particles. This charge causes them to be coagulated or precipitated. On addition of small amount of electrolytes, the ions carrying oppiste charge are adsorbed by sol particles resulting in the neutralization of their charge. When the sol particles either with no charge or reduced charge, come closer due to Brownian movement, they coalesce to form bigger particles resulting in their separation from the dispersion medium. This is what is called coagulating or precipitation of the colloidal solution. The coagulating power of the effective ion, which depend on its charge, is expressed in terms of its coagulating value, defined as its minimum concentration (m mol/L) needed to precipitate a given sol. When 9.0 ml of arsenious sulphide sol and 1.0 ml of `1.0 xx 10^(-4) M BaCl_(2)` are mixed, turbidity due to precipitation just appears after 2 hours. The effective ion and its coagulating value are respectively :A. `Cl^(-) 10 m " mol"//L`B. `Cl^(-) 20 m " mol"//L`C. `Ba^(2+), 10 m " mol"//L`D. `Ba^(2+), 20 m " mol"//L` |
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Answer» Correct Answer - C |
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| 1283. |
Assertion: In physisorption, adsorption increase with increases in temperature. Reason: Physisorpation is of exothermic nature.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 Physisorption decreases with increase in temperature. |
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| 1284. |
Assertion: A catalyst is more effective in finely divided form. Reason: Finely divided form the more surface area.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 - A A catalyst is more effective in finely divided form because finely divided form has more surface area. Therefore there is an increase in active centres on the surface. |
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| 1285. |
Assertion: A reaction cannot become fast by itself unless a catalyst is added. Reason: A catalyst always increases the speed of a reaction.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 Both assertion and reason are false. there are reactions in which one of the products acts as catalyst (autocatalysiis) and no catalyst is added. |
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| 1286. |
Migration of colloidal particles under the influence of electrie field is known as………………… |
| Answer» Correct Answer - Electrophoresis | |
| 1287. |
which of the following electrolytes have maximum coagulationg power ?A. `C Cl_(4)`B. `ZnCl_(2)`C. `KCl`D. `NaCl` |
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Answer» Correct Answer - B `ZnCl_(2)` has maximum coagulation power due to more charge on the `Zn`. |
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| 1288. |
Tyndall phenomenon is exhibited byA. `Nacl` solutionB. starch solutionC. urea solutionD. `FeCl_(3)` solution |
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Answer» Correct Answer - D Tynall phenmenon is exhibited by strach solution because strach solution is a colloidal solution. |
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| 1289. |
Assertion: The Brownian movement is due to the bombardment on colloidal particle by the molecules of dispersion midium which are in the constant motion like molecules in a gas. Reason: Brownian movement provides a visible proof of the random kinetic motion of molecules in a liquid.A. Statement 1 is true, statmeent 2 is true, statement 2 is a correct explanation for statement 1B. Statement 1 is true, stateement 2 is true, statement 2 is not a correct explanation for statement 1C. Statement 1 is true, statement 2 is falseD. Statement 1 is false, statement 2 is true |
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Answer» Correct Answer - B On the basis of brownian movement, we can say that molecules are in continuous motion. |
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| 1290. |
Assertion: The Brownian movement is due to the bombardment on colloidal particle by the molecules of dispersion midium which are in the constant motion like molecules in a gas. Reason: Brownian movement provides a visible proof of the random kinetic motion of molecules in a liquid.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 - B on the basis of Brownian movement, we can say that molecules are in continuous motion. |
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| 1291. |
Assertion: The Brownian movement is due to the bombardment on colloidal particle by the molecules of dispersion midium which are in the constant motion like molecules in a gas. Reason: Brownian movement provides a visible proof of the random kinetic motion of molecules in a liquid.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1.C. Statement-1 isTrue, Statement-2 is False.D. Statement-1 is False, Statement-2 is True. |
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Answer» Correct Answer - B |
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| 1292. |
Movement of colloidal particles under the influence of electrostatic field isA. ElectrophoresisB. ElectrolysisC. DialysisD. Ionisation |
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Answer» Correct Answer - A Movement of chargedcollodal particles under the influence of electrostatic field is called eelctrophoresis due to opposite charge. |
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| 1293. |
In a electrical field, the particles of a colloidal system move towards cathode. The coagulation of the same sol is studied using `K_2SO_4(I)`,Na_3PO_4(II)`,(K_4[Fe(CN)_6]`(III) and NaCI (IV). Their coagualating power should be :A. IgtIIgtIIIgtIVB. IIIgtIIgtIgtIVC. IIIgtIgtIIgtIVD. IVgtIIIgtIgtII |
| Answer» Correct Answer - B | |
| 1294. |
Arsenic (III) sulphide forms a sol with a negative charge. Which of the following ionic substances should be most effective in coagulating the sol?A. `KCl`B. `MgCl_(2)`C. `Al_(2)(SO)_(4)`D. `Na_(3)PO_(4)` |
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Answer» Correct Answer - C The more the charge on cation, the more the effectiveness of the electrolyte. |
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| 1295. |
Which type of property is the Brownian movement of colloidal sol?A. electricalB. opticalC. machanicalD. Colligative |
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Answer» Correct Answer - C it is creaseless zigzag motion of colloidal particles. So mechanical property. |
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| 1296. |
Smoke has generally blue tinge. It is due toA. Scattering of lightB. coagulationC. Brownian motionD. electro-osmosis |
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Answer» Correct Answer - A |
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| 1297. |
Among the following, which surfactant will form micelles in aqueous solution at the lowest molar concentration at ambient conditions?A. `CH_(3)(CH_(2))_(15)N^(o+)(CH_(3))_(3)Br^(Θ)`B. `CH_(3)(CH_(2))_(11)OSO_(3)^(Θ)Na^(o+)`C. `CH_(3)(CH_(2))_(6)COO^(Θ)Na^(o+)`D. `CH_(3)(CH_(12))_(11)N^(o+)(CH_(3))_(3)Br^(Θ)` |
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Answer» Correct Answer - A Among the given options, the surfactant that will form micells in aqueous solution at the lowest molar concentration at ambient conditions is `CH_(3)(CH_(2))_(15)No^(o+)(CH_(3))_(3)Br^(ɵ)` . |
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| 1298. |
A colloidal solution is subjected to an electrical field. The particle move towards anode. The coagulation of same sol is studied using `NaCl, BaCl_(2)` and `AlCl_(3)` solutions. Their coagulating power should beA. `NaCl gt BaCl_(2) gt AlCl_(3)`B. `BaCl_(2) gt AlCl_(3) gtNaCl`C. `AlCl_(3) gt BaCl_(2) gt NaCl`D. `BaCl_(2) gtNaCl gt AlCl_(3)` |
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Answer» Correct Answer - C |
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| 1299. |
Arsenic (III) sulphide forms a sol with a negative charge. Which of the following ionic substances should be most effective in coagulating the sol?A. `KCl`B. `MgCl_(2)`C. `Al_(2)(SO_(4))_(3)`D. `Na_(3)PO_(4)` |
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Answer» Correct Answer - C `As_(2)S_(3)` sol is a negatively charged colloid. `Al^(3+)` has greater charge, therefore, `Al_(2)(SO)_(4)` is most effective in the coagulation of `As_(2)S_(3)` sol. |
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| 1300. |
Among the following , the surfactant that will form nicelles in aqueous solution at the lowest nola concentration at amibemt conditions, is :A. ` CH_3 (CH_2)_(15)N^+ (CH_3)_3 Br^-`B. `CH_3 (CH_2)_(11)OSO_3^(-) Na^+`C. `CH_3 (CH_2)_(6)OSO_3^(-) Na^+`D. ` CH_3 (CH_2)_(11)N^+ (CH_3)_3 Br^-` |
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Answer» Correct Answer - a Larger si the hydrophobic part in surfactant more is its ability to formn micelles at lower concentration and `CH_3(CH_2)_(15) N^+(CH_3)_3 Br^-` has longest hydrocarbon chain (i.e., hydrogphobic). |
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