Q.1
The brown ring complex is formulated as [Fe(H2O5NO+]SOthe oxidation number of iron is .. [ IIT 1987]
  • a)1
  • b) 2
  • c)3
  • d)0
Q.2
The oxidation number in S8, S2F2, H2S respectively are [IIT 1999]
  • a)0, +1 and -2
  • b) +2, +1 and -2
  • c)0, +1 and +2
  • d)-2, +1 and -2
Q.3
The reaction of KMnO4 and HCl results is [ CPMT 2000]
  • a)Oxidation of Mn in KMnO4 and production of Cl2
  • b) reduction of Mn in KMnO4 and production of H2
  • c)Oxidation of Mn in KMnO4 and production of H2
  • d)Reduction of Mn in KMnO4 and production of Cl2
Q.4
On reduction of KMnO4 by oxalic acid in acidic medium, the oxidation number of Mn changes. What is the magnitude of this change? [ MP PMT 2000]
  • a) From 7 to 2
  • b) From 6 to 2
  • c) From 5 to 2
  • d) From 7 to 4
Q.5
The oxidation state of chromium in potassium dichromate (K2Cr2O7) is ..[AFMC 1999]
  • a)-5
  • b) +6
  • c)+2
  • d)-2
Q.6
Consider the following reaction5H2O2 + xClO2 +2OH- → xCl- +yO2 + 6H2OThe reaction is balanced is ...[CPMT 2000]
  • a) x=5, y=2
  • b) x=2, y=5
  • c)x=4, y=10
  • d)x=5, y=5
Q.7
the set of numerical coefficients that balance the equation K2CrO4 + HCl → K2Cr2O7 + KCl + H2O is [kerala CEE 2001]
  • a) 1, 1, 2, 2, 1
  • b) 2, 2, 1, 1, 1
  • c)2, 1, 1, 2, 1
  • d)2, 2, 1, 2, 1
Q.8
oxidation number of S in H2S2O8 is [ MP PMT 2002]
  • a) +2
  • b) +4
  • c) +6
  • d) +7
Q.9
The oxidation state of osmium (OS) in OsO4 is [ AIIMS 1999]
  • a)+7
  • b) +6
  • c)+4
  • d)+8
Q.10
Which of the following molecules can acts as an oxidising as well as reducing agent? [ kerala MEE2000]
  • a) H2S
  • b) SO3
  • c)H2O2
  • d)H2SO4
Q.11
The oxidation states of sulphur in the SO3-, S2O42- and S2O62- follows the order
  • a)S2O4-2
  • b)SO3 2-
  • c)S2O4-2
  • d)S2O62-
Q.12
Student states that burning of lime is an oxidation process. the reason he sites is that an oxide of metal is produced on burning Which of the following statement about the above reaction is correct?
  • a) Both the statement and reason are correct and reason are the correct explanation of the statement
  • b) Both the statement and reason are correct and reason are the correct but reason is not correct explanation of the statement
  • c) The statement is correct but the reason is incorrect
  • d) The statement is incorrect but reason is correct
Q.13
Of the following reactions, only one is a redox reaction. identify it [ CPMT 2000]
  • a)Ca((OH)2 + 2HCl → CaCl2 + 2H2O
  • b) BaCl2 +MgSO4 → BaSO4 + MgCl2
  • c)2S2O72- + 2H2O → 4SO42- + 4H+
  • d)Cu2S + 2FeO → 2Cu + SO2
Q.14
Equivalent mass of oxidising agent in the reactionSO2 + 2H2S → 3S + 2H2O [ DEC 2000]
  • a) 32
  • b) 64
  • c)16
  • d)8
Q.15
For the reactionMx+ + MnO4- → MO3- +Mn2+ + ½ O2If one mole of MnO4- oxidises 1.67moles of Mx+ to Mn3-, then the value of x in the reaction is
  • a)5
  • b)3
  • c)2
  • d)1
Q.16
Number of moles of KMnO4 required to oxidise one mole of Fe(C2O4) in acidic medium is
  • a) 0.6
  • b) 1.67
  • c) 0.2
  • d) 0.4
Q.17
A metal ion M3+ loses 3 electrons, its oxidation number will be [ CPMT 1999]
  • a)+3
  • b) +6
  • c)0
  • d)-3
Q.18
The oxidation number of iron in Fe3O4 is [ CBE PMT 1999]
  • a) +2
  • b) +3
  • c)8/3
  • d)2/3
Q.19
The chemical that undergoes self oxidation and self reduction in the same reaction is [ Tamil nadu CET 20001]
  • a) benzyl alcohol
  • b) acetone
  • c)formaldehyde
  • d)acetic acid
Q.20
In which of the following complexes, oxidation state of metal is zero? [ MPPET 1998]
  • a) [Pt(NH2)2Cl2]
  • b) [Cr(CO)6]
  • c) [Cr(NH3)3Cl3]
  • d) [Ce(en)2Cl2]
Q.21
Which statement is not correct? [ MPCET1999]
  • a)Potassium permanganate is a powerful oxidising substance
  • b) Potassium permanganate is a weaker oxidising agent than potassium dichromate
  • c)Potassium permanganate is a stronger oxidising agent than potassium dichromate
  • d)Potassium dichromate oxidises a secondary alcohol into ketone
Q.22
In the chemical reaction Ag2O + H2O + 2e- → 2Ag + 2OH- [kerala CEE 2000]
  • a) Water is oxidised
  • b) Electrons are reduced
  • c)Silver is oxidised
  • d)silver is reduced
Q.23
When KMnO4 acts as an oxidising agent and ultimately form MnO4-2, MnO2, Mn2O3 and 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.24
A compound of Xe and F is found to have 53.3% Xe(atomic weight=133). Oxidation number of Xe in this compound is
  • a) +2
  • b) 0
  • c) +4
  • d) +6
Q.25
The oxidation number of Cobalt in K2[Co(NO2)6] is .. [ EAMCE 1998]
  • a)0
  • b) +4
  • c)+3
  • d)+6
Q.26
What is the coefficient of oxalate ion in the following reaction?MnO4- + C2O42- + H+ → Mn2+ + CO2 + H2O [ JIPMER 1999]
  • a) 4
  • b) 2
  • c)3
  • d)5
Q.27
Which of the following is not reducing agent? [ DEC 2000]
  • a) SO2
  • b) H2O2
  • c)CO2
  • d)NO2
Q.28
In the reaction 2KMn4 +16HCl → 5Cl2 + 2MnCl2 +2KCl + 8H2Othe reduced product is [ kerala MEE 2003]
  • a) Cl2
  • b) MnCl2
  • c) H2O
  • d) KCl
Q.29
If molecular weight of KMnO4 is 'M' then its equivalent weight in acidic medium would be .. [ MP PMT 1998]
  • a)M
  • b) M/2
  • c)M/5
  • d)M/4
Q.30
In H2O2, the oxidation state of oxygen is [ CPMT 2000]
  • a) -2
  • b) -1
  • c)0
  • d)-4
0 h : 0 m : 1 s