Q.1
The standard oxidation potential of zinc and silver in water at 298K are Zn(s) → Zn2+(aq) +2e- . 0.76V Ag(s) → Ag+ + e- , -0.80 V Which of the following reactions actually takes place? [ NCERT 1983]
  • a)Zn(s) + 2Ag+(aq) → Zn2+(aq) + 2Ag(s)
  • b) Zn2+ +2Ag(s) → 2Ag+(s) + Zn(s)
  • c)Zn(s)+ Ag(s) → Zn2+(aq) + Ag+(aq)
  • d)Zn2+(aq) + Ag+(aq) → Zn(s) + Ag(s)
Q.2
Molar ionic conductivity of a bi-bivalent electrolyte are 57 andThe molar conductivity of the solution will be [ DPMT 2002]
  • a) 130 S cm2 mol-1
  • b) 65 S cm2 mol-1
  • c)260 S cm2 mol-1
  • d)187 S cm2 mol-1
Q.3
E.M.F of cell is measured by .. [ KCET 1984]
  • a) Voltmeter
  • b) potentiometer
  • c)galvanometer
  • d)ammeter
Q.4
If 0.01M solution of an electrolytic has a resistance of 40 Ohms in a cell having cell constant of 0.4 cm- then its molar conductance in ohm- cm2 mol- will be [ CBSE PMT 1996]
  • a) 104
  • b) 103
  • c) 102
  • d) 10
Q.5
A solution containing one mole per litre of each Cu(NO3)2, AgNO3, Hg2(NO3)2 and Mg(NO3)2 is being electrolysed by using inert electrodes. the values of standard electric potentials in volts ( reduction potentials) are Ag/Ag+=0.80, 2Hg/Hg22+=0.79 Cu/Cu2+=0.34, Mg/Mg2+=-2.37 With increasing voltage, the sequence of deposition of metals on the cathod will be .. [ IIT 1984]
  • a)Ag, Hg, Cu, Mg
  • b) Mg, Cu, Hg, Ag
  • c)Ag, Hg, Cu
  • d)Cu, Hg, Ag
Q.6
A solution of sodium sulphate in water is electrolysed using inert electrodes. the products at the cathode and anode are respectively .. [ IIT 1987]
  • a) H2, O2
  • b) O2, H2
  • c)O2, Na
  • d)O2, SO4
Q.7
The resistance of 0.1N solution of a salt is found to be 2.5×103 ohms. The equivalent conductance of the solution is (cell constant=1.15 cm-1) [ Manipal PMT 2001]
  • a) 4.6
  • b) 5.6
  • c)6.6
  • d)7.6
Q.8
How many c.c. of oxygen will be liberated by 2 amp current flowing for 3 minutes and 13 second through acidulated water? [ AFMC 1981]
  • a) 11.2 c.c
  • b) 33.6 c.c.
  • c) 44.8 c.c.
  • d) 22.4 c.c.
Q.9
the electric charge for electrode deposition of one gram equivalent of substance is ..[IIT 1984]
  • a) One ampere for one second
  • b) 96500 coulombs per second
  • c) charge on one mole of electrons
  • d) One ampere for one hour
Q.10
Specific conductance of 0.1M Nitric acid is 6.3 × 10-2 ohm-1cmthe molar conductance of the solution is
  • a) 630 ohm-1 cm2
  • b) 315 ohm-1 cm2
  • c) 100 ohm-cm2
  • d) 6300 ohm-1cm2
Q.11
The reference calomel electrode is made from which of the following? [ MP 2002]
  • a) ZnCl2
  • b) CuSO4
  • c) Hg2Cl2
  • d) HgCl2
Q.12
On passing 1 F of electricity through the electrolytic cells containing Ag+, Ni2+, Cr3+ ions solution, the deposited Ag( At wt = 108), Ni(At wt. = 59) and Cr(At. wt. =52) are . . . . respectively [ AIIMS 1982]
  • a) 108.0 gm, 29.5gm , 17.3 gm
  • b) 108.0gm, 59.0gm, 52.0gm
  • c) 108.0gm, 108.0gm, 108.0gm
  • d) 108.0gm, 117.5gm, 166.0gm
Q.13
The amount of ion discharged during electrolysis is not directly proportional to [ NCERT 1983]
  • a)Resistance
  • b) Time
  • c)Current
  • d)Chemical equivalent of ion
Q.14
The equivalent conductance of NaCl, HCl and C2H5COONa at infinite dilution are 126.45, 426.16 and 91 ohm-1 cmThe equivalent conductance of C2H5COOH is
  • a) 201.28 ohm-1cm2
  • b) 390.71-1cm2
  • c)698.28-1cm2
  • d)540.48-1cm2
Q.15
An electrolyte is one [ KCET 1984]
  • a) which conducts electric current in any solvent
  • b) which is capable of ionisation by passing current
  • c)which dissociates into ions by dissolving in a suitable solvent
  • d)non of the above
Q.16
The cell constant of given cell is 0.47cm-. the resistance of solution place in this cell is measured to be 31.6 ohm. The conductivity of the solution ( in Scm-) is [ Pb CET 1995]
  • a) 0.15
  • b) 1.5
  • c) 0.015
  • d) 150
Q.17
When electric current is passed through a cell having an electrolyte, the positive ions move towards the cathode and the negative ions towards the anode. if the cathode is pulled out of the solution [ AIIMS 1980]
  • a)the positive and negative ions will move towards the anode
  • b) the positive ions will start moving towards the anode, the negative ions will stop moving
  • c)the negative ions will continue to move towards anode; the positive ions will stop moving
  • d)the positive and negative ions will start moving randomly
Q.18
An electrolyte cell contains a solution of Ag2SO4 and has platinum electrodes. A current is passed until 1.6gm of O2 has been liberated at anode. The amount of silver deposited at cathode would be. [ CPMT 1996]
  • a) 107.88 gm
  • b) 1.6 gm
  • c)0.8 gm
  • d)21.6 gm
Q.19
THe specific conductivity of N/10 KCl solution at 20°C is 0.0212 ohm-cm- and the resistance of the cell containing this solution at 20°C is 55ohm. The cell constant is ..[AIIMS 1999]
  • a) 4.616 cm-1
  • b) 1.166 cm-1
  • c)2.1736 cm-1
  • d)3.324 cm-1
Q.20
The reaction ½ H2(g) + AgCl(s) → H+(aq) + Cl-(aq) + Ag(s) occurs in the galvanic cell [IIT 1985]
  • a) Ag|AgCl(s)|KCl(aq)|AgNO3(aq)|Ag
  • b) Pt|H2(g)|HCl(aq)|AgNO3(aq)|Ag
  • c) Pt|H2(g)|HCl(aq)|AgCl(s)|Ag
  • d) Pt|H2(g)|KCl(aq)|AgCl(s)|Ag
Q.21
other things being equal, the EMF of Daniel cell may be increased by [ Pb. CET 1988]
  • a)keeping low temperature
  • b) using large copper electrodes
  • c)Using large zinc electrodes
  • d)decreasing concentration of Cu2+ ions
Q.22
A solution of CuSO4 is electrolysed for 7 minutes with a current of 0.6amp. The amount of electricity passed is equal to [ Pb CET 1991]
  • a) 4.2 coulombs
  • b) 2.6 ×10-3 faraday
  • c)126 coulombs
  • d)35 coulombs
Q.23
A certain quantity of electricity is passed through an aqueous solution of AgNO3 and cupric salt solution connected in series. the amount of ga deposited in 1.08gm, then the amount of copper deposited is (At wt. Cu=63.5, Ag=108) [ EAMCET 1986]
  • a) 0.6454 g
  • b) 6.354 g
  • c)0.3177 g
  • d)3.177g
Q.24
Which of the following metals can deposited copper from copper sulphate solution? [ MP 1989]
  • a) Mercury
  • b) Iron
  • c) Gold
  • d) Platinum
Q.25
If same amount of electricity is passed through aqueous solution of AgNO3 and CuSO4 and the number of Ag and Cu atoms deposited are x and y respectively. then [ Pb. CET 1988]
  • a)x=y
  • b) x < y
  • c)y=2x
  • d)x=2y
Q.26
The cathode in a galvanic cell and electrolytic cell is [ Pb CET a990]
  • a) Negatively charged in both cases
  • b) Positively charged in both cases
  • c)positively charged in galvanic cell but negatively charged in an electrolytic cell
  • d)Negatively charged in a galvanic cell but positively charged in an electrolytic cell
Q.27
On the electrolysis of acidic water, if volume of hydrogen liberated is 5.6cm3, then the volume of oxygen liberated is equal to [ Pb CET 1988]
  • a) 2.8 cm2
  • b) 5.6 cm3
  • c)8.4 cm3
  • d)11.2 cm3
Q.28
From the solution of an electrolyte, one mole of electron will deposited at cathode.. [ CPMT 1997]
  • a) 63.5 gm of Cu
  • b) 24.0 gm of Mg
  • c) 11.5 gm of Na
  • d) 9.0 gm of Al
Q.29
When a copper wire is placed in a solution of AgNO3 , the solution acquires blue colour. this is due to the formation of [ Roorkee 1989][
  • a)Cu2+ ions
  • b) Cu+ ions
  • c)Soluble complex of copper with AgNO3
  • d)Cu- ion by the reduction Cu
Q.30
A current of 9.65 ampere flowing for 10 minutes deposits 3.0 g of the metal which is nonvalent. the atomic mass of the metal is ..{BHU 1989]
  • a) 10
  • b) 50
  • c)30
  • d)96.5
0 h : 0 m : 1 s