Q.1
The number of electrons required to balance the following equation. NO3- + 4H+ + e- → 2H2O + NO is [ IIT Screening Test 1991]
  • a)5
  • b) 4
  • c)3
  • d)2
Q.2
The equivalent weight of Mohr's salt, FeSO4 .(NH4)2SO4 . 6H2O is equal to ..[DPMT 1994]
  • a) Its molecular weight
  • b) Atomic weight
  • c)Half-its molecular weight
  • d)one third its molecular weight
Q.3
The oxide which cannot act as reducing agent is ..[CBSE PMT 1995]
  • a) SO2
  • b) NO2
  • c)CO2
  • d)ClO2
Q.4
Which of the following is a redox reaction ? [ CBSE PMT 1997]
  • a) H2SO4 with NaOH
  • b) In atmosphere, O3 from O2 by lighting
  • c) Nitrogen oxides form nitrogen and oxygen by lighting
  • d) Evaporation of H2O
Q.5
C2H6 (g) + nO2 → CO2(g) + H2O(l) In this equation, ratio of the coefficients of CO2 and H2 is [ KCET 1992]
  • a)1:1
  • b) 2:3
  • c)3:2
  • d)1:3
Q.6
In which of the following compounds, the oxidation number of iodine is fractional? [ BHU 1994]
  • a) If7
  • b) I3-
  • c)IF5
  • d)IF3
Q.7
In the reaction2FeCl3 + H2S → 2FeCl2 + 2HCl + S... [MLNR 1996]
  • a) FeCl3 acts as an oxidizing agent
  • b) Both H2S and FeCl2 are oxidizied
  • c)FeCl3 is oxidised while H2S is reduced
  • d)H2S acts as an oxidising agent
Q.8
Oxidation number of carbon in CH2Cl2 is [AMU 19997]
  • a) -4
  • b) +4
  • c) 0
  • d) -2
Q.9
In the chemical reaction K2Cr2O7 + a H2SO4 + bSO2 → K2SO4 + Cr2(SO4)3 + cH2O a, b, c are [BHU 1994]
  • a)1, 3, 1
  • b) 4, 1, 4
  • c)3, 2, 3
  • d)2, 1, 2
Q.10
Phosphorus has the oxidation state of +3 in [ CBSE PMT 1994]
  • a) Phosphorous acid
  • b) Orthophosphorous acid
  • c) Hypophosphorous acid
  • d)Metalphosphoric acid
Q.11
In which of the following compounds, nitrogen has an oxidation state of -1? [ AIIMS 1994]
  • a) N2O
  • b) NO2-
  • c)NH2OH
  • d)N2H4
Q.12
The violent reaction between sodium and water is an example of [ CPMT 1987]
  • a) Reduction
  • b) Oxidation
  • c) Redox reaction
  • d) Neutralization reaction
Q.13
The oxidation number of phosphorus in Ba(H2PO2)2 is ..[IIT 1990]
  • a)+3
  • b) +2
  • c)+1
  • d)-1
Q.14
Formula weight divided by the change in oxidation number gives [..[BHU 1994]
  • a) equivalent weight of an oxidant
  • b) equivalent weight of the reductant
  • c)the number of electrons gained in the reaction
  • d)the equivalent weight of the oxidant or reductant
Q.15
Which of the following involves transfer of five electrons? [ JIPMER 1994]
  • a) MnO4- → Mn2+
  • b) CrO4- → Cr3+
  • c)MnO43- → MnO2
  • d)Cr2O72- → 2Cr3+
Q.16
When KMnO4 reacts with acidified FeSO4.. [ MP PET 1996]
  • a) Only FeSO4 is oxidised
  • b) Only KMnO4 is oxidised
  • c) FeSO4 is oxidised and KMnO4 is reduced
  • d) None of the above
Q.17
One of the following has both positive and negative oxidation states..[ DPMT 1994]
  • a) F
  • b) Cl
  • c)He
  • d)Na
Q.18
The equivalent weight of MnSO4 is half its molecular weight when it is converted into [ CPMT 1992]
  • a)Mn2O3
  • b) MNO4-
  • c)MnO2
  • d)MnO42-
Q.19
Which of the following behaves as both oxidizing and reducing agents [AFMC 1995]
  • a) H2SO4
  • b) SO2
  • c)H2S
  • d)HNO3
Q.20
In which of the following reactions, there is no change in valency? [ CBSE PMT 1994]
  • a) 4KClO3 → 3KClO4 + KCl
  • b) SO2 + 2H2S → 2H2O + 3S
  • c)BaO2 + H2SO4 → BaSO4 + H2O2
  • d)2BaO + O2 → 2BaO2
Q.21
In the following reaction, which is the species being oxidised? [ AMU 1997]2Fe3+a(aq) + 2I- (aq) → I2(aq) + 2Fe2+(aq)
  • a)Fe3+
  • b) I-
  • c)I2
  • d)Fe2+
Q.22
KMnO4 oxidises oxalic acid in acidic medium. the number of CO2 molecules produced as per the balanced equation is ... [ EAMCET 1998]
  • a) 10
  • b) 8
  • c) 6
  • d) 3
Q.23
In which of the compound does manganese exhibit highest oxidation number? [ AFMC 1994]
  • a)MnO2
  • b) Mn3O4
  • c)K2MnO4
  • d)MnSO4
Q.24
In the reaction between SO2 and O3, the equivalent weight of ozone is [ JIPMER 1994]
  • a) the same as its molecular weight
  • b) half the molecular weight
  • c)one third of the molecular weight
  • d)one-fourth of the molecular weight
Q.25
Oxidation number of cobalt in KI[Co(CO)4] is ..[haryana CEET 1996]
  • a)+1
  • b)+3
  • c)-1
  • d)-3
Q.26
SO2 acts as an oxidant when it reacts with [EAMCET 1987]
  • a) Acidified KMnO4
  • b) Acidified K2Cr2O7
  • c) H2S
  • d) Acidified C2H5OH
Q.27
Consider the reaction Zn + Cu2+ → Zn2+ + Cu With reference to the above, which one of the following is the correct statement? [] BIT 1991]
  • a)Zn is reduced to Zn2+
  • b) Zn is oxidised to Zn2+
  • c)Zn2+ is oxidised to Zn
  • d)Cu2+ is oxidised to Cu
Q.28
Which of the following reactions depicts the oxidising property of SO2 [DPMT 1994]
  • a) SO2 + H2O → H2SO3
  • b) 2H2S + SO2 → 3S + 2H2O
  • c)Cl2 + SO2 → SO2Cl2
  • d)2MnO4- + 5SO2 +2H2O → 5SO4- + 2Mn2+ + 4H+
Q.29
Oxidation number of nitrogen in (NH4)2SO4 is [ CPMT 1996]
  • a) -1/3
  • b) -1
  • c)+1
  • d)-3
Q.30
xMnO4- + yC2O42- + zH+ → Mn2+ +CO2 + H2O, the correct coefficient x, y and z are .. [ IIT 1992]
  • a) 2, 5, 16
  • b) 16, 5, 2
  • c) 5, 16, 2
  • d) 2, 16, 5
0 h : 0 m : 1 s