Q.1
In the standardization of Na2S2O3 using K2Cr2O7 by iodomentry, the equivalent weight of K2Cr2O7 is [ IIT 2001]
  • a) (Molecular weight)/2
  • b) (molecular weight)/6
  • c) (Molecular weight )/3
  • d) Same as molecular weight
Q.2
Oxidation state of Cl in CaOCl2 is
  • a)0
  • b) +1
  • c)-1
  • d)+1, -1
Q.3
Amount of oxalic acid present in a solution can be determined by its titration with KMnO4 solution in presence of H2SOThe titration gives unsatisfactory result when carried out in the presence of HCl, because HCl ..[ AIEEE 2008]
  • a) oxidises oxalic acid to carbon dioxide and water
  • b) gets oxidised by oxalic acid to chlorine
  • c)furnishes H+ ions in addition to those from oxalic acid
  • d)reduces permanganate to Mn2+
Q.4
When copper is treated with a certain concentration of nitric acid, nitric oxide and nitrogen dioxide are liberated in equal volumes according to the equation xCu + yHNO3 → xCu(NO3)2 + 2NO + (y/2)H2O The coefficient x and y are
  • a) 2 and 3
  • b) 1 and 6
  • c)1 and 3
  • d)3 and 8
Q.5
KI and CuSO4 solution when mixed give
  • a) CuI2 + K2SO4
  • b) Cu2I2 + K2SO4
  • c) Cu2I2 + K2SO4 + I2
  • d) CuI2 + K2SO4 + I2
Q.6
Equivalent mass of oxidising agent in the reaction SO2 + 2H2S → 3S +2H2O is
  • a)32
  • b) 64
  • c)16
  • d)8
Q.7
Number of moles of KMnO4 required to produce one mole of Fr(C2O4) in acidic medium is
  • a) 0.6
  • b) 0.4
  • c)0.2
  • d)1.67
Q.8
In the reaction 3CuO + 2NH3 → N2 + 3H2O + 3Cu the change of NH3 to N2 involvs
  • a) Loss of 6 electrons per molecule of N2
  • b) Loss of 3 electrons per molecule of N2
  • c)Gain of 6 electrons per molecule of N2
  • d)Gain of 3 electrons per molecule of N2
Q.9
White P racts with caustic soda, the products are PH3 and NaH2POthis reaction is an example of ..[ IIT 1990]
  • a) Oxidation
  • b) Reduction
  • c) Disproportionation
  • d) Neutralisation
Q.10
When KMnO4 acts as oxidizing agent and ultimately forms Mn42-, MnO2O3, Mn>2+ then the number of electrons transferred in each case respectively is ..[ AIEEE 2002]
  • a)4, 3, 1, 5
  • b) 1, 5, 3, 7
  • c)1, 3, 4, 5
  • d)3, 5, 7, 1
Q.11
the chemical that undergoes self oxidation and self reduction in the same reaction is [ Ramil Nadu CET 2001]
  • a) Bezyl alcohol
  • b) Acetone
  • c)Formaldehyde
  • d)Acetic acid
Q.12
What is the oxidation state of P in Ba(H2PO2)2
  • a) +3
  • b) +2
  • c)+1
  • d)-1
Q.13
For decolouration of 1 mole of acidified KMnO4 the moles of H2O2 required is
  • a) 1/2
  • b) 3/2
  • c) 5/2
  • d) 7/2
Q.14
The equivalent conductance of two strong electrolytes at infinite dilution in H2O ( Where ions moving freely through a solution)at 25°C are given below ΛCH3COONa=91.0 S cm2 / equiv. Λ HCl=426.2 S cm2 / equiv. What additional information/ quantity one needs to calculate Λ of an aqueous solution of acetic acid? [ AIEEE 2007]
  • a)Λ of chloroacetic acid ( ClCH2COOH)
  • b) Λ of NaCl
  • c)Λ of CH3COOK
  • d)The limiting equivalent conductance of H+ ( λ H+)
Q.15
Several blocks of magnesium are fixed to the bottom of a ship to [ AIEEE 2003]
  • a) Keep away the sharks
  • b) MAke the ship lighter
  • c)Prevent action of water and salt
  • d)prevent puncturing by under sea-rocks
Q.16
In the electrolytic cell, flow of electrons is from .. [ IIT 2003]
  • a) Cathode to anode in solution
  • b) Cathode to anode through external supply
  • c)Cathode to anode through internal supply
  • d)Anode to cathode through internal supply
Q.17
Charge required to liberate 11.5 g sodium is Na+ +e- → Na 23 g of sodium requires 1 F charge for liberation for 11.5 g of sodium requires=11.5/23=0.5 F
  • a) 96500 coulombs
  • b) 1.5 F
  • c) 0.1 F
  • d) 0.5 F
Q.18
electrolysis of dilute aqueous NaCl solution was carried out by passing 10 mili ampere current. The time required to liberate 0.01 mol of H2 gas at the cathode is ( 1 Faraday=96500 C mol-1){IIT 2008]
  • a)9.650 × 104 sec
  • b) 19.3 ×104 sec
  • c)28.95 × 104 sec
  • d)38.6 × 104 sec
Q.19
Reaction that takes place at graphite anode in dry cell is
  • a) Zn2+ + 2e- → Zn
  • b) Zn → Zn2+ + 2e-
  • c)Mn2+ + 2e- → Mn
  • d) Mn → Mn2+ + 2e-
Q.20
The molar conductivities ΛNaOAc and ΛHCl at infinite dilution in water at 25°C are 91.0 and 426.2 S cm2/mol respectively. To calculate ΛHOAc, the additional value required is [ AIEEE 2006]
  • a) ΛH2O
  • b)ΛKCl
  • c)ΛNaOH
  • d)ΛNaCl
Q.21
Given the data at 25°C Ag + I - → AgI + e-; Eo=0.152 V Ag → Ag+ + e-; Eo=-0.800 VWhat is the value of logKsp for AgI [ AIEEE 2006]
ch-7_que_no-49_img_no1.png
  • a)-8.12
  • b) +8.612
  • c)-37.83
  • d)-16.13
Q.22
The standard electrode reduction potentials of Zn, Ag and Cu are -0.76, 0.80 and 0.34 volt respectively, then
  • a) Ag can oxidise Zn and Cu
  • b) Ag can reduce Zn+ and Cu+
  • c)Zn can reduce Ag+ and Cu2+
  • d)Cu and oxidise Zn and Ag
Q.23
A depolarizer used in dry cell is
  • a) Ammonium chloride
  • b) Sodium carbonate
  • c)Lead sulphate
  • d)Manganese dioxide
Q.24
The standard reduction potential forFe2+ / Fe and Sn2+ / Sn electrodes are -0.44 and -0.14 volts respectively. For the cell reaction Fe2+ + Sn → Fe + Sn2+ , the standard emf is [ IIT 1988]
  • a) +0.30 V
  • b) -0.58 V
  • c) +0.58 V
  • d) -0.30 V
Q.25
In the electrolysis of water, one faraday of electrical energy would evolve
  • a)8 g oxygen
  • b) one mole of oxygen
  • c)one g atom of oxygen
  • d)22.4 litres of oxygen
Q.26
The cell, Zn|Zn2+ ( 1M) || Cu2+ (1M) | Cu Ecello=1.10 V Was allowed to be completely discharged at 298K. The relative concentration of Zn2+ to Cu2+ is [AIEEE 2007]
  • a) 9.65 × 104
  • b) antilog(24.08)
  • c)37.3
  • d)1037.3
Q.27
The standard emf of a cell involving one electron chage is found to be 0.591V at 25°C. The equilibrium constant of the reaction is ( F=96500 C mol-1, R=8.314 JK- mol-)
  • a) 1.0 ×101
  • b) 1.0 ×1030
  • c)1.0 ×1010
  • d)1.0 ×105
Q.28
In the cell that utilises the reaction Zn + 2H+ → Zn2+ + H2 addition of H2SO4 to cathode compartment, will [AIEEE 2004]
  • a) Lower the E and shift equilibrium to left
  • b) Increase the E and shift equilibrium to left
  • c) Increases the E and shift equilibrium to the right
  • d) Lower the E and Shift equilibrium to right
Q.29
In a hydrogen - oxygen fuel cell, combustion of hydrogen occurs to [ AIEEE 2004]
  • a)Generate heat
  • b) Remove absorbed oxygen from electrode surfaces
  • c)Produce high purity water
  • d)Create potential difference between two electrodes
Q.30
The e.m.f of cellZn|Zn+ ( 0.01M) || Fe+ ( 0.001M)| Fe at298K is 0.257 then the value of equilibrium constant for the cell reaction is [ IIT 2004]
  • a)
    ch-7_qn-58choice_img_no1.png
  • b)
    ch-7_qn-58choice_img_no2.png
  • c)
    ch-7_qn-58choice_img_no3.png
  • d)
    ch-7_qn-58choice_img_no4.png
0 h : 0 m : 1 s