CET QUESTIONSCET QUESTIONS ON ELECTROCHEMISTRY
CET QUESTIONSONELECTROCHEMISTRYVikasana - CET 2012
1. Electrolytic and metallic conductance differs from1. Electrolytic and metallic conductance increases withiincreaseoff temperature2. Electrolytic conductance increases and metallicconductance decreases with increase of temperature3. Electrolytic conductance decreases and metallicconductance remains constant with increase oftemperaturey and metallic conductance decreases with4. Electrolyticincrease of temperatureVikasana - CET 2012
2. WhenWh a currentt off 1.251 25 ampere flflowsthrough the solution of chromium (III)sulphate,l h t 1.31 3 g off chromiumhiisi depositeddit dat the cathode in time(At mass of Cr 52)1. 108 min.2. 9.65 min.3 96.53.96 5 minmin.4. 52 min.Vikasana - CET 2012
3. The time required to liberate 89 cm3 of H2gas at STP if 7 ampere current flows is1.12.33.4.109.5410954 secsec.19.9 sec.10 954 sec10.954sec.101.1 sec.Vikasana - CET 2012
4. Mathematical statement of Faraday’ssecond law is1. W1/E2 W2/E12. E1/W2 E2/W13. E2/W1 E1/W24. W1/W2 E1/E2Vikasana - CET 2012
5. Same quantity of electric current is passedg the solutions of CuSO4 and AgNOgthrough3,32 g of Cu is deposited at the cathode infirst case. The mass of Ag deposited insecond case will be1. 32 g2. 108 g3. 10.8 gVikasana - CET 20124. 320 g
6. Of the followings, which one isconjugate acid and base1.12.33.4.H2SO4 and HSO4-1H2SO4 and HClHNO3 and H3O H2CO3 and H3O Vikasana - CET 2012
7. In an electrolytic cell, electrons movefrom1.12.33.4.Cathode to anodeAnode to cathodeCation to anionAnion to cationVikasana - CET 2012
8. Which among the followings isamphoprotic?1 H2SO41.2. SO4-23. H3O 4. H2PO4-1Vikasana - CET 2012
9. Molar conductance and equivalentyconductance are same for the electrolytehaving1. Same molecular mass and empiricalformula mass2. Different molecular mass and empiricalformula mass3. Different molecular mass and equivalentmassVikasana - CET 20124. Same molecular mass and equivalent mass
10. The conjugate base of OH- is1.2.3.4.H 2OO-22H 3O OH Vikasana - CET 2012
11. If an acid is weak, its conjugate base is1.2.3.4.Strong or weakWeakNeutralStrongVikasana - CET 2012
12. For conjugate acid-base pairs1.2.3.4.Pka Pkb 0Pka Pkb 14Pka - Pkb 0Pka PHVikasana - CET 2012
13. When the same quantity of current ispassed through silver salt and gold saltsolutions deposited 0.583 g of Ag and0.35 g of Au. The oxidation state of Au inits salt is At mass of Au 197, Eq. massof Ag 1081. 12. 23. 44. 3Vikasana - CET 2012
14. The degree of dissociation of a weakelectrolyte increases1. On increasingg pressurep2. On increasing dilutiong strongg electrolytey3. On addingcontaining common ionsg dilution4. On decreasingVikasana - CET 2012
15.The Pka values of acetic acid, benzoicacid and formic acid are 4.757, 4.257and 3.752, respectively. Among theseacids, which is stronger?1. Acetic acid 2. Formic acid3. Benzoic acid 4. noneVikasana - CET 2012
16.At 90 C, pure water has concentrationof H3O 1 x 10-6 M. The value of kw atthe same temperature is1.2.3.4.10-610-1210-1410-7Vikasana - CET 2012
17. Sodium is added to a solution of aceticacid Then PH of ChangedVikasana - CET 2012
18.The PH of 10-8 molar aqueoussolution of HCl is1.2.3.4.8-66 to 77 to 8Vikasana - CET 2012
19. More acid is added to solution ofPH 5 in order to reduce the PH 2.2The increase in H ion concentration is1.2.3.4.100 times3 times5 times1000 timesVikasana - CET 2012
20. Which pair will show common ioneffect?1.12.33.4.BaCl2 Ba(NO3)2NaCl HClCH3-COOH NaOHNH4-OH NH4ClVikasana - CET 2012
21 Which of the salt solution would beacidic?1.12.33.4.Na2SO4NaHSO3K2SO4Na2SO3Vikasana - CET 2012
22. Which of the following cannot beconsidered as Lewis acid?1.12.33.4.H AlCl3NH4 BF3Vikasana - CET 2012
23. Which of the following pair is Lewisbase as well as Bronstead base?1.12.3.4.NH3 andd H 2ONaOH and NH3NaOH and HClNH3 and BF3Vikasana - CET 2012
24.Which of the following does not makeany change in PH, when added to 10 mldilute HCl?1.22.3.44.5 ml pure water20 ml pure water10 ml HCl20 ml same dilute HClVikasana - CET 2012
25. ka of acetic acid is 1.8 x 10-5. If the ratioof concentration of salt to acid is 1 M,them PH of the solution is1.2.3.4.3.74.75.31.4Vikasana - CET 2012
26. In an electroplating, the article to beelectroplated acts as1. Cathode12. Electrolyte3. Anode4. ConductorVikasana - CET 2012
27.PH of a mixture of two solutions of PH 3andd 4,4 iin theth ratioti 1:41 4 isi1.12.33.4.3.8383.23 553.553.5Vikasana - CET 2012
28. PH of the solution produced when anqvolume of solutions havingg PH 5equaland PH 4 are mixed, is1. 4.32. 4.043 3.53.354. 3.56Vikasana - CET 2012
29. The PH of solution produced by mixing250 cm3 of a solution of PH 3 and 750cm3 of a solution PH 5 is1. 4.52. 43. 3.34. 3.6Vikasana - CET 2012
30. The buffer action of blood is due to thepresence ofp1. HCl and NaCl12. Amino acids and NH33. Urea and Na 4. Bicarbonate ions and carbonic acidVikasana - CET 2012
31. A solution of ammonium acetate isneutral because1 both1.b h theh acidid andd basebfformingiasalt are weak electrolytes2 both the acid and base forming a2.salt are strong electrolytes3 dissociation constants of weak acid3.and weak base are same4 ammonium acetate does not undergo4.Vikasana - CET 2012hydrolysis
32. A solution is called super-saturated if1.2.33.4.Ionic pproduct solubilityypproductIonic produce solubility productIonic produce solubility productNone of the aboveVikasana - CET 2012
33. In an electro-chemical cell,1 electrical energy is converted into1.chemical energy2. chemical energy is converted intoelectrical energy3. chemical energy is converted into heat4 electrical energy is converted into heat4.Vikasana - CET 2012
34.The hydrogen electrode is dipped in asolution of PH 3 at 25 C. The potentialattained by it is1. 0.177 V2. -0.1770.177 V3. 0.087 V4. 0.0591 VVikasana - CET 2012
35. Magnesium can be used to protect ironstructures from corrosion, since1. magnesium is less electropositiveelement2. magnesium is light metal3. magnesium is cheapgacts as anode and getg4. magnesium- CET 2012oxidised inVikasanapreferenceto iron
36. emf of the cell is measured accuratelyusing1. voltmeter2. potentiometer3 Galvanometer 4.3.4 AmmeterVikasana - CET 2012
37. Aluminium is more reactive than iron. Butaluminium is less easily corroded than ion1. Aluminium is p-block element2 Aluminium forms a protective oxide2.film over its surface3 IIron reacts3.t easilyil withith watert4. Iron forms both divalent and trivalentVikasana - CET 2012ions
38. For sparingly soluble salt of the typeA2B,B solubility and solubility productare related as1 ksp S31.2. ksp S23. ksp S34. ksp 4S3Vikasana - CET 2012
39. Second group metal sulphides NoneVikasana - CET 2012
40.In SHE platinised platinum foil is usedbecause1. It prevents poisoning2 It prevents reaction of metal with HCl2.3. It increases efficiency of adsorption ofH24. It prevents reaction of metal with theexternaltl wireiVikasana - CET 2012
41. In an electro-chemical cell, current movefrom1. A1Anoded tto cathodeth d2. Cathode to anode3. Cation to anion4. Anion to cationVikasana - CET 2012
42. Arrangement of metals Al, Cu, Fe, Mgand Zn in the order which they displaceeachh other.th GivenGithatth t E0MgM -2.37V,2 37VE0Al -1.66V, E0Cu 0.34V, E0Fe 0.44V and E0Zn -0.76V0.76V1. Mg Al Zn Fe Cu2 Mg Al Zn Cu Fe2.3. Al Zn Mg Fe Cu4. Mg Zn Al Fe CuVikasana - CET 2012
43. The potential of copper electrodedippedpp in 0.1 M CuSO4 solution at 25 Cis [Given E0Cu 0.34V]1.2.3.4.0.34V0.31V0.349V0.28VVikasana - CET 2012
44. The relation between standard freegy changeg and standard emf of theenergycell is1. G0 -nEcellnEcell2. G0 -nFE0cell3 G nFEcell3.FE ll4. G0 nFE0cellVikasana - CET 2012
45.The maximum work done from the Danielcell, if its E0cell is 1.1 volt. [Zn Zn 2(1M) Cu 2 (1M) Cu]1. -2.12 kJ2. 21.23 kJ3. -212.3 kJ 4. 2123 kJVikasana - CET 2012
46. Cell reaction is spontaneous, when1.2.3.4.E0red is positive G0 is positiveE0redd is negative G0 is negativeVikasana - CET 2012
47.The ksp of CuS, Ag2S and HgS are 10-31,44 and 10-5454, respectively.10-44respectivelyWhich sulphide is ppted earlier?1 CuS1.C S2 A2.Ag2S3. HgS4. All the sulphidesVikasana - CET 2012
48. Solubility product of a sparingly solublesalt AX2 is 3.2 x 10-11. Its solubilityy inmol dm3 is1) 5.6 x 10-63) 2 x 10-42) 3.1 x 10-44) 4 x 10-4Vikasana - CET 2012
49. The dissociation constants of formicacid and acetic acid are 1.771 77 x 10-4 and1.77 x 10-5, respectively. The relativestrengths of two acids is1.2.33.4.3.181006 366.365Vikasana - CET 2012
50. Buffer capacity of buffer solution ismaximum when1 PH 01.2. [salt] / [acid] 13. [salt] [acid]4 [salt] [acid]4.Vikasana - CET 2012
Vikasana - CET 2012
Vikasana - CET 2012 increase of temperature. 2. Wh t f 1 25 flWhen a current of 1.25 ampere flows through the solution of chromium (III) sulht 13 f h i i d itdlphate, 1.3 g of chromium is deposited . 21.23 kJ 3. -212.3 kJ 4. 2123 kJ Vikasana - CET
About Electrochemistry Electrochemistry has been the official journal of The Electrochemical Society of Japan (ECSJ) since 1999. Electrochemistry succeeds the journal Denki Kagaku (Japanese word for ‘Electrochemistry’) which was first published in 1933 with the aim of contributing to science and industry through electrochemistry.
3.2.3 Syllabus for CET for M.Tech. (Bio Technology) CET Code-148 59 3.2.4 Syllabus for CET for M.Tech. (Nano Science and Technology) CET Code-149 60 3.2.5 Syllabus for CET for M.Tech. (Engineering Physics) CET Code-150 64 3.2.6 Syllabus for CET for M.Tech. (Ro
J6635 Maharashtra MH CET 2008 : biology. J6636 Maharashtra MH CET 2008 : mathematics. J6638 Maharashtra MH CET 2008 : chemistry. J6640 CET biology (medical/ pharmacy). J6641 CET physics (medical/ engineering/ pharmacy). J6642 CET mathematics (engineering). J6637 Maharashtra MH CET 2008 : physics.
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