Q.1.
In the standardization of Na2S2O3 using K2Cr2O7 by iodomentry, the equivalent weight of K2Cr2O7 is [ IIT 2001]
-
8%
a) (Molecular weight)/2
-
54%
b) (molecular weight)/6
-
31%
c) (Molecular weight )/3
-
8%
d) Same as molecular weight
Q.2.
Oxidation state of Cl in CaOCl2 is
-
13%
a)0
-
20%
b) +1
-
20%
c)-1
-
47%
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]
-
38%
a) oxidises oxalic acid to carbon dioxide and water
-
15%
b) gets oxidised by oxalic acid to chlorine
-
15%
c)furnishes H+ ions in addition to those from oxalic acid
-
31%
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
-
20%
a) 2 and 3
-
20%
b) 1 and 6
-
20%
c)1 and 3
-
40%
d)3 and 8
Q.5.
KI and CuSO4 solution when mixed give
-
13%
a) CuI2 + K2SO4
-
27%
b) Cu2I2 + K2SO4
-
27%
c) Cu2I2 + K2SO4 + I2
-
33%
d) CuI2 + K2SO4 + I2
Q.6.
Equivalent mass of oxidising agent in the reaction SO2 + 2H2S → 3S +2H2O is
-
8%
a)32
-
23%
b) 64
-
69%
c)16
-
0%
d)8
Q.7.
Number of moles of KMnO4 required to produce one mole of Fr(C2O4) in acidic medium is
-
27%
a) 0.6
-
36%
b) 0.4
-
27%
c)0.2
-
9%
d)1.67
Q.8.
In the reaction 3CuO + 2NH3 → N2 + 3H2O + 3Cu the change of NH3 to N2 involvs
-
62%
a) Loss of 6 electrons per molecule of N2
-
23%
b) Loss of 3 electrons per molecule of N2
-
0%
c)Gain of 6 electrons per molecule of N2
-
15%
d)Gain of 3 electrons per molecule of N2
Explanation
Q.9.
White P racts with caustic soda, the products are PH3 and NaH2POthis reaction is an example of ..[ IIT 1990]
-
7%
a) Oxidation
-
14%
b) Reduction
-
79%
c) Disproportionation
-
0%
d) Neutralisation
Explanation
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]
-
17%
a)4, 3, 1, 5
-
42%
b) 1, 5, 3, 7
-
33%
c)1, 3, 4, 5
-
8%
d)3, 5, 7, 1
Explanation
Q.11.
the chemical that undergoes self oxidation and self reduction in the same reaction is [ Ramil Nadu CET 2001]
-
18%
a) Bezyl alcohol
-
18%
b) Acetone
-
64%
c)Formaldehyde
-
0%
d)Acetic acid
Q.12.
What is the oxidation state of P in Ba(H2PO2)2
-
19%
a) +3
-
19%
b) +2
-
38%
c)+1
-
25%
d)-1
Q.13.
For decolouration of 1 mole of acidified KMnO4 the moles of H2O2 required is
-
17%
a) 1/2
-
17%
b) 3/2
-
50%
c) 5/2
-
17%
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]
-
22%
a)Λ of chloroacetic acid ( ClCH2COOH)
-
33%
b) Λ of NaCl
-
0%
c)Λ of CH3COOK
-
44%
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]
-
0%
a) Keep away the sharks
-
21%
b) MAke the ship lighter
-
50%
c)Prevent action of water and salt
-
29%
d)prevent puncturing by under sea-rocks
Q.16.
In the electrolytic cell, flow of electrons is from .. [ IIT 2003]
-
8%
a) Cathode to anode in solution
-
23%
b) Cathode to anode through external supply
-
38%
c)Cathode to anode through internal supply
-
31%
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
-
31%
a) 96500 coulombs
-
0%
b) 1.5 F
-
15%
c) 0.1 F
-
54%
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]
-
0%
a)9.650 × 104 sec
-
83%
b) 19.3 ×104 sec
-
17%
c)28.95 × 104 sec
-
0%
d)38.6 × 104 sec
Q.19.
Reaction that takes place at graphite anode in dry cell is
-
7%
a) Zn2+ + 2e- → Zn
-
64%
b) Zn → Zn2+ + 2e-
-
29%
c)Mn2+ + 2e- → Mn
-
0%
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]
-
18%
a) ΛH2O
-
9%
b)ΛKCl
-
18%
c)ΛNaOH
-
55%
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]
-
14%
a)-8.12
-
29%
b) +8.612
-
14%
c)-37.83
-
43%
d)-16.13
Explanation
Q.22.
The standard electrode reduction potentials of Zn, Ag and Cu are -0.76, 0.80 and 0.34 volt respectively, then
-
41%
a) Ag can oxidise Zn and Cu
-
12%
b) Ag can reduce Zn+ and Cu+
-
29%
c)Zn can reduce Ag+ and Cu2+
-
18%
d)Cu and oxidise Zn and Ag
Q.23.
A depolarizer used in dry cell is
-
22%
a) Ammonium chloride
-
0%
b) Sodium carbonate
-
33%
c)Lead sulphate
-
44%
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]
-
17%
a) +0.30 V
-
25%
b) -0.58 V
-
33%
c) +0.58 V
-
25%
d) -0.30 V
Q.25.
In the electrolysis of water, one faraday of electrical energy would evolve
-
40%
a)8 g oxygen
-
0%
b) one mole of oxygen
-
30%
c)one g atom of oxygen
-
30%
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]
-
12%
a) 9.65 × 104
-
38%
b) antilog(24.08)
-
12%
c)37.3
-
38%
d)1037.3
Explanation
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-)
-
25%
a) 1.0 ×101
-
38%
b) 1.0 ×1030
-
38%
c)1.0 ×1010
-
0%
d)1.0 ×105
Explanation
Q.28.
In the cell that utilises the reaction Zn + 2H+ → Zn2+ + H2 addition of H2SO4 to cathode compartment, will [AIEEE 2004]
-
10%
a) Lower the E and shift equilibrium to left
-
30%
b) Increase the E and shift equilibrium to left
-
40%
c) Increases the E and shift equilibrium to the right
-
20%
d) Lower the E and Shift equilibrium to right
Q.29.
In a hydrogen - oxygen fuel cell, combustion of hydrogen occurs to [ AIEEE 2004]
-
18%
a)Generate heat
-
18%
b) Remove absorbed oxygen from electrode surfaces
-
0%
c)Produce high purity water
-
64%
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]
-
25%
a)
-
38%
b)
-
38%
c)
-
0%
d)
Explanation
