Surface chemistry Questions and Answers

1 3 and 4th point acche se samjha dijiye please or is question ka answer bhi bta dijiya 4 Which of the following is not correct 1 Activation of adsorbent increases the surface area for adsorption 2 Adsorption is surface phenomenon only 2 3 Adsorption of H and O on charcoal is chemical adsorption 4 Chemical adsorption is due to either covalent or ionic bonds

Gold number of starch is 25 The amount of 0 3125xa gm of starch is required to prevent coagulation of 100 ml of gold sol adding 10 ml of 10 NaCl solution if value of a is x then find value of 10x

What is the function of unmodified silica in SPE Select one O A To retain nonpolar species from aqueous solution B To retain polar species from organic matrices C To retain non polar species from aqueous solution D To retain polar and nonpolar species from organic matrices O E To retain polar species from aqueous solution

In an experiment it is found that at a constant temperature rate of adsorption of gas on solid surface follows the relation Rate surface area of solid A solid is taken in form of cube that has side length cm The total surface area of this cube is x cm and rate of adsorption of gas is r If this solid cube is divided equally into 10 2 cubes then total surface area available for adsorption becomes y cm and rat becomes r2 On the basis of above information select correct statement s x is 6 y is 6 0 x 104 6 x 104

Which one is correct order of coagulating value of electrolytes for a given Sb S3 sol 1 BaCl NaCl AICI 3 2 NaCl MgCl Al SO4 3 3 CaCl NaCI AICI3 4 Al SO4 3 CaCl NaCl 30 260

Which is an example of auto catalysis 1 Hydrolysis of methyl acetate acid catalysed 2 Oxidation of Na SO3 in presence of Na AsO3 3 Oxidation of oxalic acid by KMnO4 4 Formation of ammonia by Haber s process

3 1 2 cal K 4 2 77 cal K Which of the following is an example of 56 f homogeneous catalysis reaction NO g A 2SO g O2 g 2SO3 g B Hydrolysis of aqueous sucrose solution in presence of aqueous mineral acid C CH COOCH H O t CH COOH CH OH D CO g 2H g 1 A C 3 A D Cu ZnO Cr O s 2 A B C 4 A B D HCI 1 3 1 2 cal K CH OH A 2SO g O g B face 43427 4 2 77 cal K NO g 1 A C 3 A D 2SO3 g C CH COOCH H O CH COOH E CH OH D CO g 2H g Cu ZnO Cr O3 s 2 A B C 4 A B D CH O

2 2 Langmuir adsorption isotherm for the dissociative adsorption of D p partial pressure of D and k ratio of rate constants for adsorption and desorption is a 0 kp 1 kp b 0 k 1 kp c 0 kp 2 1 kp 2 d 0 1 2 P 1 kp s

Which one of the following is an incorrect statement for physisorption Question Type Single Correct Type N 1 It is reversible 2 It is multilayered English Review Q 3 It requires activation energy 4 It decreases with increasing temperature

A gaseous mixture of C H4 CH4 CO and N at 400 K 1 atm was added with excess of O subjected to sparking in a rigid container volume constant If pressure of CO obtained at 400 K in same volume is 0 9 atm and that of H O vapour is 0 8 atm If moles of C H and CH are equal then calculate the pressure of each gas in the original mixture 4 4

cm is chopped lengthwise into 5 equa pieces Then the effective adsorption power Mark for review late Increases by 2 33 times Decreases by 2 33 times Increases by 2 14 times Decreases by 2 14 times

Select the correct statement s a Rate constants are never negative b Partial orders are never negative c Molecularity and order of reaction both are equal for elementary reactions d Order of reaction may be change with change in practical conditions temp and pres Select the correct statement s

5 Find value at pressure 2atm If for maximum m adsorption has a value 0 2 m If n 1 for physical adsorption 1 0 1 3 0 15 2 0 4 4 0 20 56 affiffifer X m fitur f 2 0 4 4 0 20 0 2 a 2atm afe n 1 i 1 0 1 3 0 15

View In English Gold number of hemoglobin is 0 03 Hence 100 mL of gold sol will require how much hemoglobin so that gold is not coagulated by 10 ml of 10 NaCl solution 1 2 3 Correct Answer 3 0 03 mg 30 mg 0 30mg 3 mg

Which of the following reactions is an example of heterogeneous catalysis NO2SO3 NO 2 2 2SO2 g O2 g 1 200 g O2 g 4 CH CHO 3 200 g O2 g Pt s 2CO 2CO CO CHA

2 56 A solution of a non volatile solute in water freezes at 0 30 C The vapour pressure of pure water at 298 K is 23 51 mm Hg and K for water is 1 86 degree mol The vapour pressure of rain solution at 298 K is mm Hg

When FeO is heated in presence of oxygen it gets converted into Fe2O3 A mixture of FeO and Fe2O3 when heated in air it gain 3 in weight If the simplest mass ratio of FeO to that of Fe2O3 is x y then the value of y x is 10

f Amount of gas adsorbed or MORE THAN ONE correct answer The given graphs 2 data I II III and IV represent general trends observed for different physisorption and chemisorption processes under mild conditions of temperature and pressure Which of the following choice s about 1 II III and IV is are correct 200 K 250 K P I is physisorption and II is chemisorption IV is chemisorption and II is chemisorption paganapie 2 jo jasnewy Potential Energy 7 ESTION BANK Ed Distance of molecule from the surface te 150 kJ mal i B I is physisorption and III is chemisorption

Consider the following adsorption isotherms for amount of adsorption versus pressure m 31x m 1 P 3 P XE m X m 5 2 PO 4 P P Identify the curves which are showing adsorption in multimolecular layer If the total number of curves as per the question is p then the value of p is

Which of the following is incorrect about Freundlich adsorption isotherm O It fails at high pressure of the gas It is applicable at low and moderate pressure of the gas O It is applicable at constant temperature O It is applicable at all pressure

3 Experimental study of photoelectric effect shows that Photocurrent intensity of light I II saturation current o intensity of light III photoemission occurs only at frequency greate than threshold frequency IV photoemission is an instantaneous process The correct statements are a I and II c I III and IV b I II and III d I II III and IV

Consider the associated colloids i e micelles and identify the correct statement O The part of micelle which is pointing outwards is non polar in normal water O A micelle made of sodium lauryl sulphate carries positive charge O They are also known as macromolecular colloids O Hydrophobic part of micelles enters into the greasy dirt on cloth

In bredig s arc method is it necessary t o stabilize the colloidal sol with koh my dbt is that the collidal sol formed by that will method be formed negatively c harged and that negative charge will its elf going to stabalize the sol then why a ny other stabilizer is used and if it used then with mechanism koh stabalize the sol

Match the following Column l A Physisorption B Chemisorption C Desorption D Adsorption isotherm S Solla sol Column l p Multilayer adsorption q Plot of T vs P for a given amount of ads r Strong covalent forces s Occurs at high temperature

questions Each question has 4 choices 1 2 Read More In Freundlich adsorption isotherm the slope of the plot and log P is between log On O 0 X 1 m

Adsorption of nitrogen on charcoal obeys Freundlich isotherm Graph between log X m and log P is a straight line at an angle 45 with intercept on y axis 0 301 At what pressure in atm 0 4 g of nitrogen is adsorbed per g of the charcoal

126 is shaken with 0 5 g of wood charcoal The final ample 6 50 ml of 1 M oxalic acid mol wt concentration of solution after adsorption is 0 5 M Calculate the amount of oxalic acid adsorbed per gram of charcoal

Although nitrogen does not adsorb on surface at room temperature it adsorbs on surface at 83K Which one of the following statements is correct Question Type Single Correct Type 1 2 3 4 At 83K there is formation of monomolecular layer At 83K there is formation of multimolecular layer At 83K nitrogen molecules are held by chemical bonds At 83K nitrogen is adsobed as atoms

Arrange the following electrolytes in the increasing order of coagulation the coagulation of As2S3 power for solution 1 Na3PO4 II MgCl III AICI 3 Question Type Single Correct Type 1 2 III 3 1 4

Gold number of a lyophilic sol is such a property that Question Type Single Correct Type The larger its value the 1 greater is the peptizing power The lower its value the 2 greater is the peptizing power The lower its value the 3 greater is the protecting power The larger its value the 4 greater is the protecting

53 From the figure in which of the following vessel the pressure of the gas is th highest Temperature and volume of the gases are the same in each vessel P Polm R S Q 1 mol He 1 mol SO 1 mol H 1 mol CH4 lg Charcoal A Q C R 1g Charcoal y a lg Charcoal B P D S lg Charcoal

The catalytic decomposition of N O by gold at 900 C and at an initia complete in 53 minutes and 73 complete in 100 minutes What is the order of the reaction ruti Calculate the velocity constant A 200 120 su Au B C How much of N O will decompose in 100 min at the same temperature but at initial pressure of to sux t 1w t n 19 600 mm has been measured at different

To make negative sols Agl which of the following mixing is favoured 10 ml 0 1 M AgNO3 10 ml 0 1 M KI 10 ml 0 1 M AgNO3 12 ml 0 1 M KI 12 ml 0 1 M AgNO3 8 ml 0 1 M KI X All of these

When zeolites hydrated sodium aluminum silicate is treated with hard water the sodium ions are exchanged with 1 H ion 2 Ca ion 3 SO ion 4 OH ion Melami 1 HCH 2 HCH 3 mela 4 none 99 Green

23 Sorption is the term used when 1 Adsorption takes place 2 Absorption takes placed begg 3 Both take place 4 Desorption takes place

6 Arsenic III sulphide forms a sol with a negative charge Which of the following ionic substances should be most effective in coagulating the sol 1 KCI 2 MgCl 3 Al SO4 3 4 Na3PO4

NEET 2017 3 The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As S3 are given below I NaCl 52 II BaCl 0 69 III MgSO 0 22 The correct order of their coagulating power is a I II III c III II I b II I III d III I II NEET II 2016 10

On which of the following properties does the 6 Which F coagulating power of an ion depend a The magnitude of the charge on the ion independe a Elect alone c Coag b Size of the ion alone c Both magnitude and sign of the charge on the ion d The sign of charge on the ion alone of the following NEET 2018 7 Which p on the c a Coa

2 Which one of the following statements is not correct a The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium b Enzymes catalyse mainly biochemical reactions c Coenzymes increase the catalytic activity of enzyme d Catalyst does not initiate any reaction NEET 2017 3 The coagulation values in millimoles per litre slation 8 9 a Coagulat c Electro c In Freundlic of 1 n is a between b between c 1 in cas d 1 in cas Which one incorrect al a Enzyme b Enzyme

g uniform piece of Pt is used to adsorb H gas Adsorption follows the Freundlich adsorption isotherm and graph is given as log 4 2 0 M value of is 5 4 log P atm The total mass of H gas in g that is adsorbed on given Pt piece when pressure is 4 atm is M The

According to Freundlich adsorption isotherm at high pressure the value of 2 Inversely proportional to pressure 1 Directly proportional to pressure 3 Directly proportional to square of pressure 4 Independent of pressure 18 m

Plot of log x m against log p is a straight line inclined at an angle of 45 When the pressure is 0 5 atm and Freundlich parameter k is 10 the amount of solute adsorbed per gram of adsorbent will be log 5 0 6990 Kerala PET 2008 lg 28 30

Freundlich isotherm is obeyed The slope of the plot is zero Then the extent of adsorption is Kerala PMT 2012 Directly proportional to the pressure of the gas Inversely proportional to the pressure of the gas Directly proportional to the square root of the pressure of the gas Inversely proportional to the square root of the pressure of the gas Independent of the pressure of the gas

Which of the following will show Tyndall effect 1 Aqueous solution of soap below critical micelle concentration 2 Aqueous solution of soap above critical micelle concentration 3 Aqueous solution of sodium chloride 4 Aqueous solution of sugar

Which of the following option is not matched correctly with charge on colloidal particle Al2O3 xH O positive sol Methylene blue positive sol As S3 negative sol Congo red sols positive sol

In chromium chloride CrC13 Cl ions have cubic close packed arrangement and Cr ions are present in the octahedral holes The fraction of the total number of holes occupied is 4 1 12 1 1 3 2 1 6 3 1 9

deduced using the assumption CBSE PMT 2007 The adsorption takes place in multilayers The adsorption sites are equivalent in their ability to adsorb the particle The heat of adsorption varies with coverage The adsorbed molecules interact with each

SolveLancer Test The temperature at which the solubility of surfactant is equal to surfactant s CMC SolveLancer Test a Kraft s temperature b Boyle s temperature c Critical temperature d None of these

The gold number of A B C and D sols are 0 002 0 08 12 and 48 respectively The protecting power of sols in the order of A B C D A B C D A B C D A B C D

28 90 Mark for Review Choose the correct option among the following O Lyophilic sols are reversible sols O Lyophilic sols are more stable than lyophobic sols All of these hr r O Lyophilic colloids are used to protect lyophobic colloids