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NEET Chemistry MCQ
Redox Reactions And Electro Chemistry Mcq
Quiz 4
Solution
Q.1.
The number of electrons required to balance the following equation. NO3- + 4H+ + e- → 2H2O + NO is [ IIT Screening Test 1991]
27%
a)5
7%
b) 4
13%
c)3
53%
d)2
Q.2.
The equivalent weight of Mohr's salt, FeSO4 .(NH4)2SO4 . 6H2O is equal to ..[DPMT 1994]
71%
a) Its molecular weight
0%
b) Atomic weight
29%
c)Half-its molecular weight
0%
d)one third its molecular weight
Q.3.
The oxide which cannot act as reducing agent is ..[CBSE PMT 1995]
10%
a) SO2
20%
b) NO2
60%
c)CO2
10%
d)ClO2
Q.4.
Which of the following is a redox reaction ? [ CBSE PMT 1997]
0%
a) H2SO4 with NaOH
22%
b) In atmosphere, O3 from O2 by lighting
67%
c) Nitrogen oxides form nitrogen and oxygen by lighting
11%
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]
0%
a)1:1
27%
b) 2:3
64%
c)3:2
9%
d)1:3
Q.6.
In which of the following compounds, the oxidation number of iodine is fractional? [ BHU 1994]
0%
a) If7
50%
b) I3-
38%
c)IF5
12%
d)IF3
Q.7.
In the reaction2FeCl3 + H2S → 2FeCl2 + 2HCl + S... [MLNR 1996]
50%
a) FeCl3 acts as an oxidizing agent
12%
b) Both H2S and FeCl2 are oxidizied
12%
c)FeCl3 is oxidised while H2S is reduced
25%
d)H2S acts as an oxidising agent
Q.8.
Oxidation number of carbon in CH2Cl2 is [AMU 19997]
30%
a) -4
0%
b) +4
60%
c) 0
10%
d) -2
Q.9.
In the chemical reaction K2Cr2O7 + a H2SO4 + bSO2 → K2SO4 + Cr2(SO4)3 + cH2O a, b, c are [BHU 1994]
25%
a)1, 3, 1
38%
b) 4, 1, 4
38%
c)3, 2, 3
0%
d)2, 1, 2
Q.10.
Phosphorus has the oxidation state of +3 in [ CBSE PMT 1994]
22%
a) Phosphorous acid
44%
b) Orthophosphorous acid
11%
c) Hypophosphorous acid
22%
d)Metalphosphoric acid
Q.11.
In which of the following compounds, nitrogen has an oxidation state of -1? [ AIIMS 1994]
29%
a) N2O
14%
b) NO2-
57%
c)NH2OH
0%
d)N2H4
Q.12.
The violent reaction between sodium and water is an example of [ CPMT 1987]
0%
a) Reduction
20%
b) Oxidation
50%
c) Redox reaction
30%
d) Neutralization reaction
Q.13.
The oxidation number of phosphorus in Ba(H2PO2)2 is ..[IIT 1990]
12%
a)+3
25%
b) +2
50%
c)+1
12%
d)-1
Q.14.
Formula weight divided by the change in oxidation number gives [..[BHU 1994]
0%
a) equivalent weight of an oxidant
0%
b) equivalent weight of the reductant
29%
c)the number of electrons gained in the reaction
71%
d)the equivalent weight of the oxidant or reductant
Q.15.
Which of the following involves transfer of five electrons? [ JIPMER 1994]
80%
a) MnO4- → Mn2+
0%
b) CrO4- → Cr3+
20%
c)MnO43- → MnO2
0%
d)Cr2O72- → 2Cr3+
Q.16.
When KMnO4 reacts with acidified FeSO4.. [ MP PET 1996]
0%
a) Only FeSO4 is oxidised
0%
b) Only KMnO4 is oxidised
80%
c) FeSO4 is oxidised and KMnO4 is reduced
20%
d) None of the above
Q.17.
One of the following has both positive and negative oxidation states..[ DPMT 1994]
20%
a) F
40%
b) Cl
20%
c)He
20%
d)Na
Q.18.
The equivalent weight of MnSO4 is half its molecular weight when it is converted into [ CPMT 1992]
0%
a)Mn2O3
25%
b) MNO4-
50%
c)MnO2
25%
d)MnO42-
Q.19.
Which of the following behaves as both oxidizing and reducing agents [AFMC 1995]
40%
a) H2SO4
20%
b) SO2
20%
c)H2S
20%
d)HNO3
Q.20.
In which of the following reactions, there is no change in valency? [ CBSE PMT 1994]
0%
a) 4KClO3 → 3KClO4 + KCl
0%
b) SO2 + 2H2S → 2H2O + 3S
100%
c)BaO2 + H2SO4 → BaSO4 + H2O2
0%
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)
25%
a)Fe3+
50%
b) I-
0%
c)I2
25%
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]
33%
a) 10
33%
b) 8
33%
c) 6
0%
d) 3
Q.23.
In which of the compound does manganese exhibit highest oxidation number? [ AFMC 1994]
33%
a)MnO2
33%
b) Mn3O4
33%
c)K2MnO4
0%
d)MnSO4
Q.24.
In the reaction between SO2 and O3, the equivalent weight of ozone is [ JIPMER 1994]
33%
a) the same as its molecular weight
33%
b) half the molecular weight
33%
c)one third of the molecular weight
0%
d)one-fourth of the molecular weight
Q.25.
Oxidation number of cobalt in KI[Co(CO)4] is ..[haryana CEET 1996]
50%
a)+1
0%
b)+3
25%
c)-1
25%
d)-3
Q.26.
SO2 acts as an oxidant when it reacts with [EAMCET 1987]
25%
a) Acidified KMnO4
25%
b) Acidified K2Cr2O7
25%
c) H2S
25%
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]
0%
a)Zn is reduced to Zn2+
75%
b) Zn is oxidised to Zn2+
25%
c)Zn2+ is oxidised to Zn
0%
d)Cu2+ is oxidised to Cu
Q.28.
Which of the following reactions depicts the oxidising property of SO2 [DPMT 1994]
0%
a) SO2 + H2O → H2SO3
33%
b) 2H2S + SO2 → 3S + 2H2O
33%
c)Cl2 + SO2 → SO2Cl2
33%
d)2MnO4- + 5SO2 +2H2O → 5SO4- + 2Mn2+ + 4H+
Q.29.
Oxidation number of nitrogen in (NH4)2SO4 is [ CPMT 1996]
0%
a) -1/3
0%
b) -1
67%
c)+1
33%
d)-3
Q.30.
xMnO4- + yC2O42- + zH+ → Mn2+ +CO2 + H2O, the correct coefficient x, y and z are .. [ IIT 1992]
33%
a) 2, 5, 16
33%
b) 16, 5, 2
33%
c) 5, 16, 2
0%
d) 2, 16, 5
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