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CBSE Questions for Class 11 Medical Chemistry Redox Reactions Quiz 13 - MCQExams.com

The oxidation number of carbon in CH2F2 is:
  • 0
  • 1
  • 4
  • 6
The sum of oxidation states of all atoms in ClO4 is:
  • 0
  • -4
  • -1
  • +2
In which following compounds, phosphorous exhibits its highest oxidation state?
  • H3PO2
  • H4P2O7
  • H4P2O6
  • H4P2O5
Oxidation number of chlorine atoms in CaOCl2 are
  • 0,0
  • 1,1
  • 1,+1
  • 2,+7
Find the potential of a half-cell having reaction, Ag2S+2e2Ag+S2 in a solution buffered
pH=3 and which is also saturated with 0.1 M H2S. For H2S: K1=108 and K2=2×1013, Ksp(Ag2S)=2×1048, EoAg,ag=0.8
  • 0.432 V
  • 1.658 V
  • 0.245 V
  • 0.144 V
The number of mole of ferrous oxalate oxidized by one mole of KMnO4 in acidic medium is:​
  • 1.66
  • 5
  • 0.6
  • 2
The oxidation state of iron in chalco pyrite (CuFeS2) is 
  • +1
  • +3
  • +2
  • +4
How many moles of KMnO4 are required to oxidise one mole of SnCl2 in acidic medium ?
  • 15
  • 25
  • 35
  • 45
In Zn|Zn+2||Ag+|Ag, how will cell potential be affected if KI is added to Ag+ half cell?
  • Ecell will increase
  • Ecell will decrease
  • Ecell will remain unaffected
  • Ecell is first increase then decrease
Which is a redox reaction ?
  • 2CuI2CuI+I2
  • NaCl+AgNO3AgCl+NaNO3
  • NH4Cl+NaOHNH3+NaCl+H2O
  • Cr2(SO4)3+6KOH2Cr(OH)3+3K2SO4
When ethane is burnt in excess of oxygen, the oxidation number of carbon changes by
  • +8
  • +7
  • +3
  • +4
What is the sum of oxidation number of all carbon in C6H5CHO ?
  • -4
  • 5
  • 6
  • 7
Which of the following is correct about oxidation number?
  • The O.N. of all atoms in elementary states is 0
  • Alkali and alkaline earth metals have +1 and +2 oxidation states respectively
  • The O.N. of a monoatomic ion is the same as its charge
  • All of the above
Average oxidation state of Fe in Fe3O4 is 
  • 23
  • 45
  • 54
  • 83
2Fe(CO)5PhotolysisFe(CO)9 + CO Oxidation of Fe in Fe2(CO)9
  • 4.5
  • 2
  • 3
  • 0
Find out the values of a,b,c and d in the following equation:

IO3+aI+bH+ cH2O+dI2
  • a=3, b=2, c=1, d=1
  • a=5, b=6, c=3, d=3
  • a=5, b=6, c=3, d=6
  • a=10, b=12, c=6, d=6
Following reaction describes the rusting of iron 4Fe+3O24Fe3++602, which one of the following statement is incorrect?
  • This is an example of a redox reaction
  • Metallic iron is reduced to Fe3 + 
  • Fe3 +  is an oxidizing agent
  • Metallic iron is a reducing agent
Of the following transition metals, the maximum number of oxidation states is shown by
  • Cr
  • Mn
  • Fe
  • Ti
Which of the following is a redox:
  • 2NaAg(CN)2+ZnNa2Zn(CN)4+2Ag
  • BaO2+H2SO4BaSO4+H2O
  • N2O5+H2O2HNO3
  • AgNO3+KIAGI+KNO3
Consider the half-cell reaction(s)
Cu2++eCu+;Eo=0.15V
Cu2++2eCu;Eo=0.33V
Eo for the half-cell reaction: Cu++eCu will be:
  • 0.48V
  • 0.18V
  • 0.31V
  • 0.51V
What is the oxidation state of iodine when it is oxidized in the form I -  in neutral medium by permanganate ion
  • +5
  • +7
  • +3
  • +1
A compound contains atoms A,B and C . The oxidation number of A is +2, of B is +5 and of C is 2. The possible formula of the compound is:
  • ABC2
  • A2(BC3)2
  • A3(BC4)2
  • A3(B4C)2
An element A in a compound ABD has oxidation number -n. It is oxidized by Cr2O72 -  in acid medium. In the experiment, 1.68×103 moles of K2Cr2O7 were used for 1.68×103 mole ABD. The new oxidation number of A after oxidation is :
  • 3
  • 3 - n
  • n - 3
  • + n
In the reaction Cu+H2SO4CuSO4+H2O+SO2
  • H +  is the oxidising agent
  • SO is the oxidising agent
  • Both (A) and (B) are correct
  • None of the above is correct
What is the oxidation number of N in NH2OH
  • -2
  • -1
  • 0
  • +1
Which of the following arrangement represents increasing O.N. of central atom.
  • CrO2,ClO3,CrO24,MnO4
  • ClO3,CrO24,MnO4,CrO2
  • CrO2,ClO3,MnO4,CrO24
  • CrO24,MnO4,CrO2,ClO3
The oxidation states of the most electronegative element in the product of the reaction of BaO2 with dilute H2SO4 are:
  • +1 and +2
  • -1 and +2
  • -2 and -2
  • -2 and -1
The oxidation number of P in MgNH4PO4 is 
  • +3
  • +5
  • +2
  • +7
Match List I and List-II and select the correct answer using the codes given below the lists:
List-I (compound)List-II ( oxidation states of N ) 
(A)NO2(1)+5
(B)HNO2(2)-3
(C)NH3(3)+4
(D)N2O5(4)+3
The oxidation number of ''V'' in the complex Rb4Na[HV10O28] is 
  • +3
  • +5
  • +7
  • +6
Oxidation numbers of sulphur in H2S3 molecule are
  • -1, -1 and -1
  • -1, +1 and +1
  • -1, 0 and -1
  • +1, 0 and -1
Oxidation number of oxygen in NaO3,KO2 respectively are:
  • 3, 2
  • 1, 0
  • 0, 1
  • -0.33, -0.5
The oxidation number of nitrogen in NCl3 is 
  • +3
  • -3
  • zero
  • -1/3
When Cl2 gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from____ 
  • zero to +1 and zero to -5
  • zero to -1 and zero to +5
  • zero to -1 and zero to +3
  • zero to +1 and zero to +3
Which of the following is a non - redox process ?
  • SO24SO3
  • Cr2O27CrO24
  • PO34P2O47
  • C2O24CO2
Balance the following redou reaction
x M n O _ { 4 } ^ { - } + y F e ^ { + 2 } + z H ^ { + } \rightarrow a M n ^ { + 2 } + b F e ^ { + 3 } + c H _ { 2 } O
What is the ratio of ( x + y + z ) / ( a + b + c ) ?
  • 5 : 7
  • 7 : 5
  • 4 : 7
  • 7 : 4
Which of the following reaction is non-redox?
  • 2NaNO_{3}\rightarrow 2NaNO_{2}+O_{2}
  • CaO+SiO_{2}\rightarrow CaSiO_{3}
  • Fe+H_{2}SO_{4}\rightarrow FeSO_{4}+H_{2}
  • 4Ag+8CN^{-}+O_{2}+2H_{2}O\rightarrow 4[Ag(CN)_{2}]^{-}+4OH^{-}
HOCl(aq) is the molecule that kills bacteria wen chlorine is added to water. 
The following reaction produces this molecule
{Cl}_{2}(g)+{H}_{2}O(l)\rightleftharpoons HOCl(aq)+{H}^{+}(aq)+{Cl}^{-}(aq)
Which statement about this reaction is correct?
  • Chlorine is both oxidised and reduced
  • Chlorine is oxidised but not reduced
  • Hydrogen is both oxidised and reduced
  • Hydrogen is oxidised but not reduced
Oxidation number of oxygen in ozone \left( \mathrm { O } _ { 3 } \right) is:
  • + 3
  • - 3
  • - 2
  • 0
The oxidation state of A, B, and C in a compound are +2, +5, and -2, respectively. The correct formula for the compound is:
  • { A }_{ 2 }\left( BC \right) _{ 2 }
  • { A }_{ 2 }\left( BC \right) _{ 3 }
  • { A }_{ 3 }\left( BC_{ 4 } \right) _{ 2 }
  • { A }_{ 2 }\left( BC_{ 4 } \right) _{ 3 }
Which of the following carbonyl compounds undergoes self redox reaction in presence of concentrated base?
  • 3-Methylpentanal
  • 2-Chlorobutanal
  • 2,2-Dimethylpropanal
  • tert-butyl methyl ketone.
Which of the following statement is correct?
  • MnO^-_4 is very good oxidant in acidic medium and liberates iodine when added to KI solution by forming MnO_2 .
  • MnO^-_4 is a very good oxidant in basic medium and liberates iodine when added to KI solution by forming MnO_2 .
  • MnO^-_4 is very good oxidant in acidic medium and liberates iodine when added to KI solution by forming Mn^{2+} .
  • MnO^-_4 is very good oxidant in basic medium and liberates iodine when added to KI solution by forming Mn^{2+} .
What is the molar concentration of the triiodide solution, KI_3(aq), if 30.00 mL of the solution is required to completely react with 25.00 mL of a 0.200\ mol/L, thiosulphate solution, K_2S_2O_3(aq) ?
The chemical equation for the reaction is:
2S_2O_3^{2-}(aq) + I_3^-(aq)\rightarrow S_4O_6^{2-} (aq)+3 I^-(aq)
  • 0.0333 M
  • 0.12 M
  • 0.0833 M
  • 0.00012 M
Balance the following redox reaction
xMnO_{4}^{-} + yFe^{+2} + zH^{+} \rightarrow aMn^{+2} + bFe^{+3} + cH_2O
What is the ratio of (x + y + z)/ (a + b + c)?
  • 5 : 7
  • 7 : 5
  • 4 : 7
  • 7 : 4
The dissociation constant for CH_{3}COOH is 1.8\times 10^{-5} at 298\ K. The electrode potential for the half-cell: Pt|H_{2}\ (1\ bar)\|0.5\ M\ CH_{3}COOH, at 298\ K is:

(log\ 2 = 0.3\ ;\ log\ 3 = 0.48\ ;\ 2.303\ RT/F = 0.06)
  • -0.3024\ V
  • -0.1512\ V
  • +0.3024\ V
  • +0.1512\ V
From the following E^{\circ} values for the half-cells:


(i)\ D\rightarrow D^{2+}+2e^{-};E^{\circ}=-1.5V

(ii)\ B^{+}+e^{-}\rightarrow B;E^{\circ}=-0.5V

(iii)\ A^{3-}\rightarrow A^{2-}+e^{-};E^{\circ}=1.5V

(iv)\ C^{2+}+e^{-}\rightarrow C^{+};E^{\circ}= +0.5V

Which combination of two half-cells would result in a cell with the largest potential?
  • (i) and (iii)
  • (i) and (iv)
  • (iii) and (iv)
  • (ii) and (iv)
The value of n in the reaction is:

Cr_{2}O_{7}^{2-}+14H^{+}+nFe^{2+}\rightarrow 2Cr^{3+}+nFe^{3+}+7H_{2}O
  • 2
  • 3
  • 6
  • 7
The atomic number of an element isThe highest oxidation state exhibited by it in its compounds is 
  • 1
  • 2
  • 3
  • 4
For the feasibility of a redox reaction in a cell, the emf should be 
  • Positive
  • Fixed
  • Zero
  • Negative
When KMnO_4 is reduced with oxalic acid in acidic solution, the oxidation number of Mn changes from
  • 7 to 4
  • 6 to 4
  • 7 to 2
  • 4 to 2
0:0:1


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