NEET Chemistry Redox Reactions / रेडॉक्स अभिक्रियाएँ Question Bank

done Self Evaluation Test - Redox Reactions Total Questions - 60

• question_answer1)
  Which of the following represents a redox reaction?
  A)
  \[NaOH+HCl\xrightarrow{{}}NaCl+{{H}_{2}}O\] done clear
  B)
  \[BaC{{l}_{2}}+{{H}_{2}}S{{O}_{4}}\xrightarrow{{}}BaS{{O}_{4}}+2HCl\] done clear
  C)
  \[CuS{{O}_{4}}+2{{H}_{2}}O\xrightarrow{{}}Cu{{(OH)}_{2}}+{{H}_{2}}S{{O}_{4}}\] done clear
  D)
  \[Zn+2HCl\xrightarrow{{}}ZnC{{l}_{2}}+{{H}_{2}}\] done clear
  View Solution play_arrow

• question_answer2)
  Which reaction involves neither oxidation nor reduction?
  A)
  \[CrO_{4}^{2-}\xrightarrow{{}}C{{r}_{2}}O{{_{7}^{2-}}^{~}}\] done clear
  B)
  \[Cr\xrightarrow{{}}CrC{{l}_{3}}\] done clear
  C)
  \[Na\xrightarrow{{}}N{{a}^{+}}\] done clear
  D)
  \[2{{S}_{2}}O_{3}^{2-}\xrightarrow{{}}{{S}_{4}}O_{6}^{2-}\] done clear
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• question_answer3)
  Zn gives \[{{H}_{2}}\] gas with \[{{B}_{2}}S{{O}_{4}}\] and \[HCl\] but not with \[HN{{O}_{3}}\] because     
  A)
  Zn acts as an oxidising agent when it reacts with \[HN{{O}_{3}}\] done clear
  B)
  \[HN{{O}_{3}}\] is weaker acid than \[{{H}_{2}}S{{O}_{4}}\]and \[HCl\] done clear
  C)
  In electrochemical series, Zn is above hydrogen done clear
  D)
  \[NO_{3}^{-}\] is reduced in preference to hydronium ion done clear
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• question_answer4)
  A compound of Xe and F is found to have 53.5% of Xe. What is oxidation number of Xe in this compound?
  A)
  - 4                                done clear
  B)
  0    done clear
  C)
  +4                                done clear
  D)
  +6 done clear
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• question_answer5)
  Which of the following is not a disproportionation reaction?
  A)
  \[2PhCHO\xrightarrow{Al{{(OEt)}_{3}}}PhCOOC{{H}_{2}}Ph\] done clear
  B)
  done clear
  C)
  \[NaH+{{H}_{2}}O\xrightarrow{{}}NaOH+{{H}_{2}}\] done clear
  D)
  All of the above. done clear
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• question_answer6)
  A solution contains \[F{{e}^{2+}},F{{e}^{3+}}\] and \[{{I}^{-}}\] ions. This solution was treated with iodine at \[35{}^\circ C.\text{ }E{}^\circ \] for \[F{{e}^{3+}}/F{{e}^{2+}}\] is \[+0.77V\] and \[{{E}^{{}^\circ }}\]or \[{{I}_{2}}/2{{I}^{-}}=0.536V.\] The favourable redox reaction is:
  A)
  \[{{I}_{2}}\] will be reduced to \[{{I}^{-}}\] done clear
  B)
  There will be no redox reaction done clear
  C)
  \[{{I}^{-}}\] will be oxidised to \[{{I}_{2}}\] done clear
  D)
  \[F{{e}^{2+}}\] will be oxidised to \[F{{e}^{3+}}\] done clear
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• question_answer7)
  Which of the following is correct code for x and y in the following reaction.

  (i) x = oxidation reaction, y = reduction reaction

  (ii) x = gain of two electrons, y = loss of two electrons,

  (iii) x = reduction reaction, y = oxidation reaction

  (iv) x = loss of two electrons, y = gain of two electrons

  A)
  (i) and (ii) done clear
  B)
  (i) and (iv) done clear
  C)
  (ii) and (iii)         done clear
  D)
  (iii) and (iv) done clear
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• question_answer8)
  One mole of \[{{N}_{2}}{{H}_{4}}\] loses 10 moles of electrons to form a new compound, y. Assuming that all nitrogen appear in the new compound, what is the oxidation state of nitrogen in y (There is no change in the oxidation state of hydrogen )
  A)
  \[-1\]    done clear
  B)
  \[-3\]    done clear
  C)
  +3                    done clear
  D)
  +5 done clear
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• question_answer9)
  The oxidation state of nitrogen is correctly given for
  A)

  Compound	Oxidation state
  \[\left[ Co{{\left( N{{H}_{3}} \right)}_{5}}Cl \right]C{{l}_{2}}\]	0

  done clear
  B)

  Compound	Oxidation state
  \[N{{H}_{2}}OH\]	-2

  done clear
  C)

  Compound	Oxidation state
  \[{{({{N}_{2}}{{H}_{5}})}_{2}}S{{O}_{4}}\]	+2

  done clear
  D)

  Compound	Oxidation state
  \[M{{g}_{3}}{{N}_{2}}\]	-3

  done clear
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• question_answer10)
  The equivalent mass of oxidising agent in the following reaction is \[S{{O}_{2}}+2{{H}_{2}}S\xrightarrow{{}}3S+2{{H}_{2}}O\]
  A)
  32         done clear
  B)
  64    done clear
  C)
  16                                 done clear
  D)
  8 done clear
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• question_answer11)
  Amongst the following, identify the species with an atom in + 6 oxidation state:
  A)
  \[{{[Mn{{O}_{4}}]}^{-}}\]  done clear
  B)
  \[{{\left[ Cr{{\left( CN \right)}_{6}} \right]}^{3-}}\] done clear
  C)
  \[C{{r}_{2}}{{O}_{3}}\]                      done clear
  D)
  \[Cr{{O}_{2}}C{{l}_{2}}\] done clear
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• question_answer12)
  Oxidation state of sulphur in anions \[SO_{3}^{2-},\,{{S}_{2}}O_{4}^{2-}\]  and \[{{S}_{2}}O_{6}^{2-}\] increases in the orders:
  A)
  \[{{S}_{2}}O_{6}^{2-}<{{S}_{2}}O_{4}^{2-}<SO_{3}^{2-}~\] done clear
  B)
  \[SO_{6}^{2-}<{{S}_{2}}O_{4}^{2-}<{{S}_{2}}O_{6}^{2-}~\] done clear
  C)
  \[{{S}_{2}}O_{4}^{2-}<SO_{3}^{2-}<{{S}_{2}}O_{6}^{2-}~\] done clear
  D)
  \[{{S}_{2}}O_{4}^{2-}<{{S}_{2}}O_{6}^{2-}<SO_{3}^{2-}~\] done clear
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• question_answer13)
  In the reaction \[3Mg+{{N}_{2}}\to M{{g}_{3}}{{N}_{2}}\]
  A)
  magnesium is reduced done clear
  B)
  magnesium is oxidized done clear
  C)
  nitrogen is oxidized done clear
  D)
  None of these done clear
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• question_answer14)
  One gas bleaches the colour of flowers by reduction, while the other by oxidation
  A)
  CO and\[C{{l}_{2}}\]      done clear
  B)
  \[S{{O}_{\text{2}}}\] and \[C{{l}_{2}}\] done clear
  C)
  \[{{H}_{2}}S\] and\[B{{r}_{\text{2}}}\]            done clear
  D)
  \[N{{H}_{3}}\] and \[S{{O}_{2}}\] done clear
  View Solution play_arrow

• question_answer15)
  In the reaction: \[C+4HN{{O}_{3}}\to C{{O}_{2}}+2{{H}_{2}}O+4N{{O}_{2}}\] \[HN{{O}_{3}}\] act as
  A)
  an oxidizing agent done clear
  B)
  an acid done clear
  C)
  an acid as well as oxidizing agent done clear
  D)
  a reducing agent. done clear
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• question_answer16)
  Which of the following represents redox reactions?

  I. \[C{{r}_{2}}O_{7}^{2-}+2\overline{O}H\xrightarrow{{}}2Cr_{4}^{2-}+{{H}_{2}}O\]

  II. \[Zn+CuS{{O}_{4}}\xrightarrow{{}}\text{ }ZnS{{O}_{4}}+Cu\]

  III. \[2MnO_{4}^{-}+3M{{n}^{2+}}+4\overline{O}H\xrightarrow{{}}\] \[5Mn{{O}_{2}}+2{{H}_{2}}O\]

  IV.  \[2C{{u}^{+}}\xrightarrow{{}}Cu+C{{u}^{2+}}\]

  A)
  I, II             done clear
  B)
  I, III done clear
  C)
  III, IV           done clear
  D)
  II, III, IV done clear
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• question_answer17)
  The standard reduction potentials at 298K for the following half reactions are given against each

  \[Z{{n}^{2+}}(aq)+2e\rightleftharpoons Zn(s);-0.762V\]

  \[C{{r}^{3+}}(aq)+3e\rightleftharpoons Cr(s);-0.740V\]

  \[2{{H}^{+}}(aq)+2e\rightleftharpoons {{H}_{2}}(g);0.00V\]

  \[F{{e}^{3+}}(aq)+e\rightleftharpoons F{{e}^{2+}}(aq);0.770V\]

  Which is the strongest reducing agent?

  A)
  Zn(s)                             done clear
  B)
  Cr(s) done clear
  C)
  \[{{H}_{2}}\left( g \right)\]                      done clear
  D)
  \[F{{e}^{3+}}(aq)\] done clear
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• question_answer18)
  The correct decreasing order of oxidation number of oxygen in compounds \[Ba{{O}_{2}},{{O}_{3}},K{{O}_{2}}\] and \[O{{F}_{2}}\] is:
  A)
  \[Ba{{O}_{2}}>K{{O}_{2}}>{{O}_{3}}>O{{F}_{2}}\] done clear
  B)
  \[O{{F}_{2}}>{{O}_{3}}>K{{O}_{2}}>Ba{{O}_{2}}\] done clear
  C)
  \[K{{O}_{2}}>O{{F}_{2}}>{{O}_{3}}>Ba{{O}_{2}}\] done clear
  D)
  \[Ba{{O}_{2}}>{{O}_{3}}>O{{F}_{2}}>K{{O}_{2}}\] done clear
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• question_answer19)
  In the balanced chemical reaction \[IO_{3}^{-}+a{{l}^{-}}+b{{H}^{-}}\xrightarrow{{}}c{{H}_{2}}O+d{{I}_{2}}\] a, b, c and d, respectively, correspond to
  A)
  5, 6, 3, 3                      done clear
  B)
  5, 3, 6, 3 done clear
  C)
  3, 5, 3, 6 done clear
  D)
  5, 6, 5, 5 done clear
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• question_answer20)
  In the reaction shown below, oxidation state of the carbon in reactant and product are (i) and (ii) respectively? Is the given reaction a redox reaction?

  \[N{{a}_{2}}C{{O}_{3}}(aq)+HCl(aq)\xrightarrow{{}}\]

  \[N{{a}^{+}}(aq)+C{{l}^{-}}(aq)+{{H}_{2}}O(l)+C{{O}_{2}}(g)\]

  A)
  (i) 6, (ii) 4, yes   done clear
  B)
  (i) 6, (ii) 6, No done clear
  C)
  (i) 4, (ii) 4, No    done clear
  D)
  (i) 4, (ii) 4, yes done clear
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• question_answer21)
  In the disproportionation reaction \[3HCl{{O}_{3}}\xrightarrow{{}}HCl{{O}_{4}}+C{{l}_{2}}+2{{O}_{2}}+{{H}_{2}}O,\] the equivalent mass of the oxidizing agent is (molar mass of \[HCl{{O}_{3}}=84.45\])   
  A)
  16.89                done clear
  B)
  32.22 done clear
  C)
  84.45                done clear
  D)
  28.15 done clear
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• question_answer22)
  The oxidation number of phosphorus in \[Ba{{({{H}_{2}}P{{O}_{2}})}_{2}}\] is
  A)
  +3                    done clear
  B)
  +2   done clear
  C)
  +1                    done clear
  D)
  - 1  done clear
  View Solution play_arrow

• question_answer23)
  How many electrons are involved in the following redox reaction?

  \[C{{r}_{2}}O_{7}^{2-}+F{{e}^{2+}}+{{C}_{2}}O_{4}^{2-}\to C{{r}^{3+}}+F{{e}^{3+}}+C{{O}_{2}}\](Unbalanced)

  A)
  3          done clear
  B)
  4      done clear
  C)
  6                                  done clear
  D)
  5 done clear
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• question_answer24)
  Given:

  \[XN{{a}_{2}}HAs{{O}_{3}}+YNaBr{{O}_{3}}+ZHCl\to \]

  \[NaBr+{{H}_{3}}As{{O}_{4}}+NaCl\]

  The values of X, Y and Z in the above redox reaction are respectively:

  A)
  2, 1, 2               done clear
  B)
  2, 1, 3 done clear
  C)
  3, 1, 6               done clear
  D)
  3, 1, 4 done clear
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• question_answer25)
  When \[S{{O}_{2}}\] is passed through acidified solution of potassium dichromate, then chromium sulphate is formed. The change in valency of chromium is
  A)
  + 4 to + 2  done clear
  B)
  + 5 to + 3 done clear
  C)
  + 6 to + 3 done clear
  D)
  + 7 to + 2 done clear
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• question_answer26)
  In which of the following transition metal complexes does the metal exhibit zero oxidation state?
  A)
  \[[Co{{\left( N{{H}_{3}} \right)}_{6}}]C{{l}_{3}}\]    done clear
  B)
  \[[Fe{{({{H}_{2}}O)}_{6}}]S{{O}_{4}}\] done clear
  C)
  \[Ni{{\left( CO \right)}_{4}}\]                  done clear
  D)
  \[\left[ Fe{{\left( {{H}_{2}}O \right)}_{6}} \right]{{X}_{3}}\] done clear
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• question_answer27)
  In which of the following pairs, there is greatest difference in the oxidation number of the underlined elements?
  A)
  \[\underline{N}{{O}_{2}}\] and \[{{\underline{N}}_{2}}{{O}_{4}}\]        done clear
  B)
  \[{{\underline{P}}_{2}}{{O}_{5}}\] and \[{{\underline{P}}_{4}}{{O}_{10}}\] done clear
  C)
  \[{{\underline{N}}_{2}}O\] and \[\underline{N}O\]            done clear
  D)
  \[\underline{S}{{O}_{2}}\] and \[\underline{S}{{O}_{3}}\] done clear
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• question_answer28)
  Which of the following statements is not correct?
  A)
  The oxidation number of S in \[{{(N{{H}_{4}})}_{2}}{{S}_{2}}{{O}_{8}}\]is +6. done clear
  B)
  The oxidation number of Os in \[Os{{O}_{4}}\] is +8. done clear
  C)
  The oxidation number of S in \[{{H}_{2}}S{{O}_{5}}\] is +8. done clear
  D)
  The oxidation number of O in \[K{{O}_{2}}\] is  -1/2. done clear
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• question_answer29)
  Among  \[N{{H}_{3}},HN{{O}_{3}},Na{{N}_{3}}\] and \[M{{g}_{3}}{{N}_{2}}\] the number of molecules having nitrogen in negative oxidation state is
  A)
  1                                  done clear
  B)
  2    done clear
  C)
  3                                  done clear
  D)
  4 done clear
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• question_answer30)
  \[a{{K}_{2}}C{{r}_{2}}{{O}_{7}}+bKCl+c{{H}_{2}}S{{O}_{4}}\xrightarrow{{}}\] \[xCr{{O}_{2}}C{{l}_{2}}+yKHS{{O}_{4}}+z{{H}_{2}}O\] The above equation balances when
  A)
  a = 2, b = 4, c = 6 and x = 2, y = 6, z = 3 done clear
  B)
  a = 4, b = 2, c = 6 and x = 6, y = 2, z = 3 done clear
  C)
  a = 6, b = 4, c = 2 and x = 6, y = 3, z = 2 done clear
  D)
  a = 1, b = 4, c = 6 and x = 2, y = 6, z = 3 done clear
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• question_answer31)
  The number of electrons involved in the reduction of one nitrate ion to hydrazine is
  A)
  8                                  done clear
  B)
  5     done clear
  C)
  3                                  done clear
  D)
  7 done clear
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• question_answer32)
  Which of the following do not show disproportionation reaction? \[ClO_{4}^{-},\,{{F}_{2}},\,C{{l}_{2}},\,ClO_{2}^{-},\,ClO_{2}^{-},\,{{P}_{4}},\,{{S}_{8}}\] and \[Cl{{O}^{-}}\]
  A)
  \[ClO_{2}^{-},\,ClO_{4}^{-},\] and \[Cl{{O}^{-}}\] done clear
  B)
  \[{{F}_{2}}\] only done clear
  C)
  \[{{F}_{2}}\] and \[ClO_{4}^{-}\] done clear
  D)
  \[ClO_{4}^{-}\] only done clear
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• question_answer33)
  In the following balanced reaction, \[XMnO_{4}^{-}+Y{{C}_{2}}O_{4}^{2-}+Z{{H}^{+}}\] \[\rightleftharpoons XM{{n}^{2+}}+2YC{{O}_{2}}+\frac{Z}{2}{{H}_{2}}O\] values of X, Y and Z respectively are
  A)
  2, 5, 16             done clear
  B)
  8, 2, 5 done clear
  C)
  5, 2, 16             done clear
  D)
  5, 8, 4 done clear
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• question_answer34)
  Consider the reaction:

  \[{{H}_{2}}S{{O}_{3}}\left( aq \right)+S{{n}^{4+}}\left( aq \right)+{{H}_{2}}O\left( I \right)\]

  \[\to S{{n}^{2+}}(aq)+HSO_{4}^{-}(aq)+3{{H}^{+}}(aq)\]

  Which of the following statements is correct?

  A)
  \[S{{n}^{4+}}\] is the oxidizing agent because it undergoes oxidation done clear
  B)
  \[S{{n}^{4+}}\] is the reducing agent because it undergoes oxidation done clear
  C)
  \[{{H}_{2}}S{{O}_{3}}\] is the reducing agent because it undergoes oxidation done clear
  D)
  \[{{H}_{2}}S{{O}_{3}}\] is the reducing agent because it undergoes reduction done clear
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• question_answer35)
  Which of the following statements is not correct about the reaction given below? \[{{K}_{4}}[Fe{{(CN)}_{6}}]\xrightarrow{oxidation}F{{e}^{3+}}+C{{O}_{2}}+NO_{3}^{-}\]
  A)
  Fe is oxidised from \[F{{e}^{2+}}\] to \[F{{e}^{3+}}.\] done clear
  B)
  Carbon is oxidised from \[{{C}^{2+}}\] to \[{{C}^{4+}}\]. done clear
  C)
  N is oxidised from \[{{N}^{3-}}\] to \[{{N}^{5+}}\]. done clear
  D)
  Carbon is not oxidised. done clear
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• question_answer36)
  Which of the following is not an intermolecular redox reaction? 
  A)
  \[MgC{{O}_{3}}\xrightarrow{{}}MgO+C{{O}_{2}}\] done clear
  B)
  \[{{O}_{2}}+2{{H}_{2}}\xrightarrow{{}}2{{H}_{2}}O\] done clear
  C)
  \[K+{{H}_{2}}O\xrightarrow{{}}KOH+(1/2){{H}_{2}}\] done clear
  D)
  \[MnB{{r}_{3}}\xrightarrow{{}}MnB{{r}_{2}}+(1/2)B{{r}_{2}}\] done clear
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• question_answer37)
  Which of the following is not a disproportionation reaction?
  A)
  \[{{P}_{4}}+5O{{H}^{-}}\xrightarrow{{}}{{H}_{2}}PO_{2}^{-}+P{{H}_{3}}\] done clear
  B)
  \[C{{l}_{2}}+O{{H}^{-}}\xrightarrow{{}}C{{l}^{-}}+ClO\] done clear
  C)
  \[2{{H}_{2}}{{O}_{2}}\xrightarrow{{}}2{{H}_{2}}O+{{O}_{2}}\] done clear
  D)
  \[Pb{{O}_{2}}+{{H}_{2}}O\xrightarrow{{}}PbO+{{H}_{2}}{{O}_{2}}\] done clear
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• question_answer38)
  In a balance equation \[{{H}_{2}}S{{O}_{4}}+xHI\to {{H}_{2}}S+y{{I}_{2}}+z{{H}_{2}}O,\] the values of x, y, z are
  A)
  x=3, y=5, z=2 done clear
  B)
  x=4, y=8, z=5 done clear
  C)
  x=8, y=4, z=4 done clear
  D)
  x=5, y=3, z=4 done clear
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• question_answer39)
  Given

  \[F{{e}^{3+}}(aq)+{{e}^{-}}\to F{{e}^{2+}}(aq);E{}^\circ =+0.77V\]

  \[A{{l}^{3+}}(aq)+3{{e}^{-}}\to Al(s);E{}^\circ =-1.66V\]

  \[B{{r}_{2}}(aq)+2{{e}^{-}}\to 2B{{r}^{-}}(aq);E{}^\circ =+1.09V\]

  Considering the electrode potentials, which of the following represents the correct order of reducing power?

  A)
  \[F{{e}^{2+}}<Al<B{{r}^{-}}\]   done clear
  B)
  \[B{{r}^{-}}<F{{e}^{2+}}<Al\] done clear
  C)
  \[Al<B{{r}^{-}}<F{{e}^{2+}}\]        done clear
  D)
  \[Al<F{{e}^{2+}}<B{{r}^{-}}\] done clear
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• question_answer40)
  For the reaction: \[N{{H}_{3}}+OC{{l}^{-}}\xrightarrow{{}}{{N}_{2}}{{H}_{4}}+C{{l}^{-}}\] in basic medium, the coefficients of \[N{{H}_{3}},OC{{l}^{-}}\] and \[{{N}_{2}}{{H}_{4}}\] for the balanced equation are respectively
  A)
  2, 2, 2               done clear
  B)
  2, 2, 1 done clear
  C)
  2, 1, 1               done clear
  D)
  4, 4, 2 done clear
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• question_answer41)
  Which of the following act as reducing agents?

  (i) \[PO_{4}^{3-}\]

  (ii) \[S{{O}_{3}}\]

  (iii) \[PO_{3}^{2-}\]

  (iv) \[N{{H}_{3}}\]

  A)
  (i), (ii) and (iii)                done clear
  B)
  Only (iii) done clear
  C)
  (i), (iii) and (iv)               done clear
  D)
  (iii) and (iv) done clear
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• question_answer42)
  In the reaction

  \[C{{r}_{2}}O_{7}^{2-}+14{{H}^{+}}+{{6I}^{-}}\xrightarrow{{}}2C{{r}^{3+}}+7{{H}_{2}}O+3{{I}_{2}}\]

  Which element is reduced?

  A)
  I                                   done clear
  B)
  O    done clear
  C)
  H                                  done clear
  D)
  Cr done clear
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• question_answer43)
  Which of the following substances acts as an oxidising as well as a reducing agent?
  A)
  \[N{{a}_{2}}O\]\[\]               done clear
  B)
  \[SnC{{l}_{2}}\] done clear
  C)
  \[N{{a}_{2}}{{O}_{2}}\]                                done clear
  D)
  \[NaN{{O}_{2}}\] done clear
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• question_answer44)
  Stronger is oxidising agent, more is
  A)
  standard reduction potential of that species done clear
  B)
  the tendency to get itself oxidized done clear
  C)
  the tendency to lose electrons by that species done clear
  D)
  standard oxidation potential of that species done clear
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• question_answer45)
  Which of the following involves transfer of five electrons?
  A)
  \[MnO_{4}^{-}\to M{{n}^{2+}}\]       done clear
  B)
  \[CrO_{4}^{2-}\to C{{r}^{3+}}\] done clear
  C)
  \[MnO_{4}^{2-}\to Mn{{O}_{2}}\] done clear
  D)
  \[C{{r}_{2}}O_{7}^{2-}\to 2C{{r}^{3+}}\] done clear
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• question_answer46)
  The brown ring complex is formulated as\[[Fe{{({{H}_{2}}O)}_{5}}NO]S{{O}_{4}}\]. The oxidation number of iron is
  A)
  1                      done clear
  B)
  2      done clear
  C)
  3                                  done clear
  D)
  0 done clear
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• question_answer47)
  In which of the following reactions, there is no change in valency?
  A)
  \[4KCl{{O}_{3}}\to 3KCl{{O}_{4}}+KCl\] done clear
  B)
  \[S{{O}_{2}}+2{{H}_{2}}\text{S}\to 2{{H}_{2}}O+3S\] done clear
  C)
  \[Ba{{O}_{2}}+{{H}_{2}}S{{O}_{4}}\to BaS{{O}_{4}}+{{H}_{2}}{{O}_{2}}\] done clear
  D)
  \[2BaO+{{O}_{2}}\to 2Ba{{O}_{2}}\] done clear
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• question_answer48)
  The reaction,  \[2{{H}_{2}}O\left( l \right)\to 4{{H}^{+}}\left( aq \right)+{{O}_{2}}\left( g \right)+4{{e}^{-}}\] is
  A)
  an oxidation reaction done clear
  B)
  a reduction reaction done clear
  C)
  a redox reaction done clear
  D)
  a hydrolysis reaction done clear
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• question_answer49)
  In the reaction \[2FeC{{l}_{3}}+{{H}_{2}}S\to 2FeC{{l}_{2}}+2HCl+S\]
  A)
  \[FeC{{l}_{3}}\] acts as an oxidising agent done clear
  B)
  Both \[{{H}_{2}}S\] are \[FeC{{l}_{3}}\] are oxidized done clear
  C)
  \[FeC{{l}_{3}}\] is oxidised while \[{{H}_{2}}S\] is reduced done clear
  D)
  \[{{H}_{2}}S\] acts as an oxidising agent. done clear
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• question_answer50)
  The oxidation number of S in \[N{{a}_{2}}{{S}_{4}}{{O}_{6}}\] is
  A)
  +0.5                 done clear
  B)
  2.5   done clear
  C)
  +4                                done clear
  D)
  +6 done clear
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• question_answer51)
  In the following reaction \[4P+3KOH+3{{H}_{2}}O\xrightarrow{{}}3K{{H}_{2}}P{{O}_{2}}+P{{H}_{3}}\]
  A)
  phosphorus is both oxidised and reduced. done clear
  B)
  only phosphorus is reduced. done clear
  C)
  phosphorus is not oxidized done clear
  D)
  None of these done clear
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• question_answer52)
  The standard electrode potentials of four elements A, B, C and D are -3.05, -1.66, -0.40 and +0.80. The highest chemical reactivity will be exhibited by:            
  A)
  A                                  done clear
  B)
  B      done clear
  C)
  C                                  done clear
  D)
  D done clear
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• question_answer53)
  The oxidation number of Fe in \[N{{a}_{2}}[Fe{{(CN)}_{5}}NO]\]is
  A)
  +2                    done clear
  B)
  +1    done clear
  C)
  +3                    done clear
  D)
  -2 done clear
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• question_answer54)
  Which of the following is the strongest reducing agent in aqueous medium?
  A)
  Mg                                done clear
  B)
  Na   done clear
  C)
  Li                                 done clear
  D)
  Ca done clear
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• question_answer55)
  The oxidation state of Fe in \[F{{e}_{3}}{{O}_{8}}\] is
  A)
  3/2                    done clear
  B)
  4/5    done clear
  C)
  5/4                    done clear
  D)
  16/3 done clear
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• question_answer56)
  Which substance serves as reducing agent in the following reaction? \[14{{H}^{+}}+C{{r}_{2}}O_{7}^{2-}+3Ni\xrightarrow{{}}\]             \[2C{{r}^{3+}}+7{{H}_{2}}O+3N{{i}^{2+}}\]              
  A)
  \[{{H}_{2}}O\]                         done clear
  B)
  Ni done clear
  C)
  \[{{H}^{+}}\]                         done clear
  D)
  \[C{{r}_{2}}O_{7}^{2-}\] done clear
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• question_answer57)
  In the reaction \[3B{{r}_{2}}+6CO_{3}^{2-}+3{{H}_{2}}O\xrightarrow{{}}\] \[5B{{r}^{-}}+BrO_{3}^{-}+6HCO_{3}^{-}\]
  A)
  bromine is oxidised and carbonate is reduced. done clear
  B)
  bromine is reduced and water is oxidized done clear
  C)
  bromine is neither reduced nor oxidized done clear
  D)
  bromine is both reduced and oxidized done clear
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• question_answer58)
  Which one of the following cannot function as an oxidising agent?
  A)
  \[{{I}^{-}}\]                            done clear
  B)
  \[S\left( s \right)\] done clear
  C)
  \[NO_{3}^{-}(aq)\]                   done clear
  D)
  \[C{{r}_{2}}O_{7}^{2-}\] done clear
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• question_answer59)
  The oxidation number of Pt in \[{{[Pt({{C}_{2}}{{H}_{4}})C{{l}_{3}}]}^{-}}\] is
  A)
  +1                    done clear
  B)
  +2   done clear
  C)
  +3                                done clear
  D)
  +4 done clear
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• question_answer60)
  Standard electrode potentials of redox couples \[{{A}^{2+}}/A,{{B}^{2+}}/B,{{C}^{2+}}/C\] and \[{{D}^{2+}}/D\] are \[0.3V,-0.5V,-0.75V\] and 0.9V respectively. Which of these is best oxidising agent and reducing agent respectively?  
  A)
  \[{{D}^{2+}}/D\] and \[{{B}^{2+}}/B\]         done clear
  B)
  \[{{B}^{2+}}/B\] and \[{{D}^{2+}}/D\] done clear
  C)
  \[{{D}^{2+}}/D\] and \[{{C}^{2+}}/C\]         done clear
  D)
  \[{{C}^{2+}}/C\] and \[{{D}^{2+}}/D\] done clear
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