Practice Test

Q1) Zinc - copper couple that can be used as a reducing agent is obtained by Show Answer

Q2) According to Faraday's second law of electrolysis when the same quantity of electricity is passed through different electrolytes, the amounts of different substance produced at the electrodes are directly proportional their Show Answer

Q3) The theory of ionization of electrolytes was proposed by Show Answer

Q4) When a piece of copper wire is immersed in a solution of silver nitrate, the colour of solution becomes blue. This is due to the Show Answer

Q5) The electrode potential of hydrogen electrode at 298 K is assumed to be Show Answer

Q6) The e.m.f. of a cell is 1.3 V. The positive electrode has a potential of 0.5 V. The potential of negative electrode is Show Answer

Q7) Which of the following statement is correct about electrochemical cell? Show Answer

Q8) Molten NaCl conducts electricity due to the presence of Show Answer

Q9) In a galvanic cell, which one of the following statement is not correct? Show Answer

Q10) The electrode potential of oxidation half cell Show Answer

Q11) When zinc rod is directly placed in copper sulphate solution Show Answer

Q12) The electrochemical cell stops working after some time because Show Answer

Q13) A metal having negative reduction potential when dipped in the solution of its own ions has a tendency Show Answer

Q14) The standard electrode potential of four electrodes I, II, III and IV are -2.65, -1.72, - 0.80 and 0.72 respectively. The highest chemical activity will be exhibited by Show Answer

Q15) The quantity of electricity needed to liberate 0.1 gram equivalent of an element at the electrode is Show Answer

Q16) Which of the following is not a good coductor of electricity? Show Answer

Q17) The cell constant is product of resistance and Show Answer

Q18) The product of specific resistance and specific conductance is equal to Show Answer

Q19) On dilution the molar conductance of an electrolyte Show Answer

Q20) The fraction of the current carried by an ion is called its Show Answer

Q21) In the concentration cell, the electrical energy is due to Show Answer

Q22) The decrease in the molar conductance of a strong electrolyte with increase in concentration is due to Show Answer

Q23) The dissociation of a weak electrolyte obeys the law of mass action. It was found by Show Answer

Q24) Four alkali metals A, B, C and D are having respectively standard reduction potential as -3.05, -1.66, -0.40 and 0.08 V. Which one will be the most reducing? Show Answer

Q25) A half reaction in an electrochemical cell is one that Show Answer

Q26) When an aqueous solution of sulphuric acid is electrolysed, the ion discharged at the anode is Show Answer

Q27) During rusting of iron, it gets Show Answer

Q28) Galvanised iron sheets are coated with Show Answer

Q29) In which of the following will the corrosion of iron be most rapid? Show Answer

Q30) The unit of electrochemical equivalents is Show Answer

Q31) Out of Cu, Ag, Fe and Zn, the metal which can displace all others from their salt solution is Show Answer

Q32) The best conductor of electricity is a solution of Show Answer

Q33) The cathode reaction in electrolysis of dilute sulphuric acid with platinum electrodes is Show Answer

Q34) The electrode potentials of four elements A, B, C and D are 1.24 V, 0.67 V, -0.26 V and -1.42 V respectively. The most reactive among these is Show Answer

Q35) The e.m.f. of a cell reaction is positive when the free energy of the cell reaction is Show Answer

Q36) A depolarizer used in dry cell is Show Answer

Q37) Two electrolytic cells, one containing acidified ferrous sulphate and other containing acidified ferric sulphate are connected in series. The ratio of iron deposited at cathodes in the two cells will be respectively Show Answer

Q38) The standard electrode potential of the elements A, B and C are 0.68, -2.50 and -0.50 V respectively. The order of their reducing power is Show Answer

Q39) The main function of salt bridge is Show Answer

Q40) The conductance of one cm cube of a solution represents its Show Answer

Q41) Which of the following solutions will have highest equivalent conductance? Show Answer

Q42) When a lead storage battery is charged, it acts as Show Answer

Q43) If a salt bridge is removed between the two half cells in an experiment, the voltage Show Answer

Q44) Strong electrolytes are those which Show Answer

Q45) Which of the following aqueous solutions will conduct electricity quite well? Show Answer

Q46) Which of the substance Na, Hg, S, Pt and graphite can be used as electrodes in electrolytic cells having aqueous solution? Show Answer

Q47) The solution of copper sulphate in which copper rod is dipped is dipped is dilutes to 10 times. The reduction potential of copper Show Answer

Q48) What will happen if a copper spoon is used to stir a solution of aluminium nitrate? Show Answer

Q49) What weight of copper will be deposited by passing 2 Faradays of electricity through a cupric salt (At. Mass = 63.5)? Show Answer

Q50) How many Faradays are required to liberate 8 g of hydrogen? Show Answer

Q51) If the specific conductance and conductance of the solution are same, then its cell constant is equal to Show Answer

Q52) How long 2.5 amp of current is passes to supply 54000 C of charge? Show Answer

Q53) A quantity of electricity equal to 3 Faraday is required to electroplate a given metal. If a current of 5 amp is used in the electrolytic cell, how long will it take to electroplate the metal? Show Answer

Q54) Salts of A (at.mass = 7), B (at. Mass = 27) and C (at. Mass = 64) were electrolysed under identical condition using the same quantity of electricity. It was found that when 2.1 g of A was deposited, the weights of B and C deposited were 2.7 g and 9.6 g. The valencies of A, B and C are respectively Show Answer

Q55) The potential of hydrogen electrode having pH = 10 is Show Answer

Q56) Standard zinc electrode is coupled with another standard electrode to form a cell whose e.m.f. was found to be 1.60 volts, reduction taking place at zinc electrode. If the standard reduction potential of the zinc electrode is -0.76 V, standard reduction potential of the other electrode is Show Answer

Q57) When a solution of an electrolyte is heated the conductance of the solution Show Answer

Q58) The charge required to liberate 11.5 g of sodium chloride is Show Answer

Q59) Which of the following metals can deposit copper from copper sulphate solution? Show Answer

Q60) During the electrolysis of fused NaCl, the anodic reaction is Show Answer

Q61) The conductance which decreases with dilution is Show Answer

Q62) The standard reduction potential values of three metallic cations X, Y and Z are 0.52, -3.03 and -1.18 V respectively. The order of reducing power of corresponding metals is Show Answer

Q63) The specific conductance of solution depends upon Show Answer

Q64) In the electrolytic cell, flow of electrons is from Show Answer

Q65) In a hydrogen - oxygen fuel cell, combustion of hydrogen occurs to Show Answer

Q66) Consider a titration of potassium dichromate solution with acidified Mohr's salt solution using diphenylamine as indicator. The number of moles of Mohr's salt required per mole of dichromate Show Answer

Q67) Which of the following is not anodic reaction in an electrochemical series? Show Answer

Q68) For a redox reaction to occur spontaneously, the e.m.f. of the cell should be Show Answer

Q69) Copper sulphate cannot be stored in a container made of zinc because Show Answer

Q70) The standard reduction potentials of zinc and silver are -0.76 and 0.8V respectively. Which of the following reactions actually occurs? Show Answer

Q71) The reference calomel electrode is made from Show Answer

Q72) One Faraday is equal to Show Answer

Q73) Which of the following gains electrons more easily? Show Answer

Q74) Which of the following can be considered as a weak electrolyte? Show Answer

Q75) The number of electrons involved in the reaction when 1 F of electricity is passed through an electrolytic solution is Show Answer

Q76) The units for cell constant are Show Answer

Q77) Which of the following relations is correct for Kohlrausch's law? Show Answer

Q78) The units of conductivity are Show Answer

Q79) The reaction occurring at cathode in Nelson's cell is Show Answer

Q80) An example of a simple fuel cell is Show Answer

Q81) Rust is a mixture of Show Answer

Q82) In lead storage battery, at cathode Show Answer

Q83) If m is the mass of substance (having equivalent weight E) produced or consumed when Q quantity of electricity is passed, then Show Answer

Q84) A solution of sodium sulphate in water is electrolysed using inert electrodes. The products at the cathode and anode are respectively. Show Answer

Q85) In the Leclanche dry cell, anode is Show Answer

Q86) Copper displaces which of the following metal from its salt solution? Show Answer

Q87) Which of the following solutions will turn blue on adding a piece of copper metal to it? Show Answer

Q88) The units of molar conductance are Show Answer

Q89) As a lead storage battery is charged Show Answer

Q90) One Faraday of electricity will liberate one gram atom of metal from a solution of Show Answer

Q91) Which of the following batteries is rechargeable? Show Answer

Q92) The calomel electrode used as reference electrode contains Show Answer

Q93) Which of the following compounds is the most easily reduced? Show Answer

Q94) The following four colourless salt solutions are placed in separate test tubes and a strip of copper is placed in each. Which solution finally turns blue? Show Answer

Q95) The standard reduction potential of Ag, Cu and Zn are 0.80 V, 0.34 V and -0.76 V respectively. Which one of the following can be stored? Show Answer

Q96) The total number of electrons involved in the reaction when one Faraday of electricity is passed through an electrolytic solution is Show Answer

Q97) Which of the following solutions will have the highest specific conductance? Show Answer

Q98) In salt bridge, generally KCl is used because Show Answer

Q99) The value of molar conductance of HCl is more than that of NaCl at a particular temperature because Show Answer

Q100) Which of the following reactions is not possible? Show Answer

Q101) Which of the following conducts electricity? Show Answer

Q102) In a Daniell cell constructed in the laboratory, the voltage observed was 0.9 V instead of 1.10 V of the standard cell. A possible explanation is Show Answer

Q103) The reduction potential of hydrogen electrode will be positive if Show Answer

Q104) What products are expected from the dispro portionation reaction of hypochlorous acid? Show Answer

Q105) At anode in the electrolysis of fused sodium chloride Show Answer

Q106) The reference electrode is made by using Show Answer

Q107) Corrosion is basically a Show Answer

Q108) Time required to deposit one millimole of aluminium metal by the passage of 9.65 amperes through molten electrolyte containing aluminium ions is Show Answer

Q109) Galvanization includes plating iron with Show Answer

Q110) Which of the following (1 M) conducts more electricity? Show Answer

Q111) Which of the following statements is true for the electrochemical Daniell cell? Show Answer

Q112) Which of the following reactions is used to make a fuel cell
Show Answer

Q113) The products formed when an aqueous solution of NaBr is electrolysed in a cell having inert electrode are Show Answer

Q114) The efficiency of a fuel cell is given by Show Answer

Q115) Kohlrausch's law states that at Show Answer

Q116) An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to Show Answer

Q117) Among the following cells
Leclanche cell (I), Nickel - Cadmium cell (II), Lead storage battery (III), Mercury Cell (IV)
primary cell are Show Answer

Q118) Standard electrode potential of three metals X, Y and Z are - 1.2 V, + 0.5 V and -3.0 V respectively. The reducing power of these metals will be:
Show Answer

Q119) The value of equilibrium constant for the feasible cell reaction is Show Answer

Q120) Which atom in the following reaction undergoes a change of oxidation state of -5? Show Answer

Q121) 10800 C of electricity through the electrolyte deposited 2.977 g of metal with atomic mass 106.4 a.m.u. The valency of metal cation is Show Answer

Q122) Four alkali metals A, B, C and D are having respectively standard electrode potentials as -3.05, -1.66, -0.40 and 0.80 V. Which will be the most reducing? Show Answer

Q123) A standard hydrogen electrode has zero electrode potential because Show Answer

Q124) The following four colourless salt solutions are placed in separate test tubes and a strip of a copper is placed in each. Which of the following solutions will finally turn blue? Show Answer

Q125) The ratio of molar conductance and specific conductance are Show Answer

Q126) When lead storage battery discharges Show Answer

Q127) Galvanised iron sheets are coated with Show Answer

Q128) In a Leclanche dry cell, anode is Show Answer

Q129) Which of the following is not correct for galvanic cell? Show Answer

Q130) Which of the following plots represents correctly the variation of equivalent conductance with dilution for a strong electrolyte? Show Answer

Q131) The expected conductometric titration for HCl against NaOH is Show Answer