CBSE Questions for Class 11 Medical Chemistry Redox Reactions Quiz 2 - MCQExams.com

In the reaction between acidified $$ KMnO_{4}$$ and hot oxalic acid, the species that gains electrons is:
  • $$K^{+}$$
  • $$MnO_{4}^{-}$$
  • $$C_{2}O_{4}^{2-}$$
  • $$CO_{2}$$
$$H_{2}O_{2}+O_{3}\rightarrow H_{2}O+2O_{2}$$, in this reaction
  • $$H_{2} O_{2}$$ is bleached
  • $$H_{2} O_{2}$$ is oxidised
  • $$H_{2} O_{2}$$ is dehydrated
  • $$H_{2} O_{2}$$ is neither oxidised nor reduced
Which of the following statement is wrong?
  • Oxidation number of oxygen is $$+1$$ in peroxides.
  • Oxidation number of oxygen is $$+2$$ in oxygen difluoride.
  • Oxidation number of oxygen is $$-\frac{1}{2}$$ in super oxides.
  • Oxidation number of oxygen is $$-2$$ in most of its compounds.
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Assertion is incorrect but Reason is correct
$$1$$ mole of $$N_{2}H_{4}$$ lost $$10$$ moles of electrons and formed a new compound, $$Y$$, in which all hydrogens are present without any change in the oxidation state. The oxidation number of nitrogen in the new compound, $$Y$$, is:
  • $$+1$$
  • $$+2$$
  • $$+3$$
  • $$+5$$
Which is not a redox reaction?
  • $$CaCO_{3}\rightarrow CaO+CO_{2}$$
  • $$2H_{2}+O_{2}\rightarrow 2H_{2}O$$
  • $$Na+H_{2}O\rightarrow NaOH+ \frac{1}{2}H_{2}$$
  • $$MnCl_{3}\rightarrow MnCl_{2}+ \frac{1}{2}Cl_{2}$$
Which of the following is a redox reaction?
  • $$NaCl+KNO_{3}\rightarrow NaNO_{3}+KCl$$
  • $$CaC_{2}O_{4}+2HCl\rightarrow CaCl_{2}+H_{2}C_{2}O_{4}$$
  • $$Mg(OH)_{2}+2NH_{4}Cl\rightarrow MgCl_{2}+2NH_{4}OH$$
  • $$Zn+2AgCN\rightarrow 2Ag+Zn(CN)_{2}$$
Iron shows least oxidation state in which of the following?
  • $$K_{4}[Fe(CN)_{6}]$$
  • $$K_{3}[Fe(CN)_{6}]$$
  • $$FeSO_{4}(NH_{4})_{2}SO_{4}(6H_{2}O)$$
  • $$Fe_{2}(CO)_{9}$$
Oxidation state of $$N$$ is given correct in :
  • $$0$$ in $$[Co(NH_{3})_{5}Cl]Cl$$
  • $$-1$$ in $$NH_{4}OH$$
  • $$-3$$ in $$(N_{2}H_{5})_{2}SO_{4}$$
  • $$-3$$ in $$Mg_{3}N_{2}$$
In which one of the following compounds does oxygen have an oxidation number of $$+2$$?
  • $$F_{2}O$$
  • $$Cl_{2}O$$
  • $$Na_{2}O_{2}$$
  • $$Na_{2}O$$
In which of the following compounds, is the oxidation number of sulphur is the least?
  • $$SO_{2}$$
  • $$SO_{3}$$
  • $$Na_{2}S_{4}O_{8}$$
  • $$H_{2}SO_{4}$$
The oxidation states of sulphur in the anions, $$SO_{3}^{2-}$$, $$S_{2}O_{4}^{2-}$$ and $$S_{2}O_{6}^{2-}$$ follow the order :
  • $$S_{2}O_{4}^{2-}$$<$$SO_{3}^{2-}$$<$$S_{2}O_{6}^{2-}$$
  • $$SO_{3}^{2-}$$< $$S_{2}O_{4}^{2-}$$< $$S_{2}O_{6}^{2-}$$
  • $$S_{2}O_{4}^{2-}$$< $$S_{2}O_{6}^{2-}$$<$$SO_{3}^{2-}$$
  • $$S_{2}O_{6}^{2-}$$<$$S_{2}O_{4}^{2-}$$<$$SO_{3}^{2-}$$
Which of the following does not involve the change of valency?
  • $$SO_{2}+2H_{2}S\rightarrow 2H_{2}O+2S$$
  • $$2Na+O_{2}\rightarrow Na_{2}O_{2}$$
  • $$Na_{2}O_{2}+H_{2}SO_{4}\rightarrow Na_{2}SO_{4}+H_{2}O_{2}$$
  • $$Zn+CuSO_{4}\rightarrow ZnSO_{4}+Cu$$
The oxidation state of the most electronegative atom in each of the product in the following reaction is
$$H_{2}+O_{2}\rightarrow H_{2}O_{2}+H_{2}O$$
  • $$-2,\: -2$$
  • $$+1,\:-2$$
  • $$+2,\:-1$$
  • $$-1,\:-2$$
Oxidation state of central atom in $$Ni(CN)_{4}^{2-}$$ is :
  • $$- 2$$
  • $$0$$
  • $$+ 2$$
  • $$+ 4$$
What is the oxidation number of chlorine in $$ClO_{3}^{-}$$?
  • $$+ 5$$
  • $$+3$$
  • $$+4$$
  • $$+2$$
The oxidation number of sulphur in $$S_8$$, $$S_2F_2$$, $$H_2S$$ respectively are:
  • $$0, +1 \ and \ -2$$
  • $$+2, +1 \ and \ -2$$
  • $$0, +1 \ and \ +2$$
  • $$-2, +1 \ and \ -2$$
The number of moles of $$K_{2}Cr_{2}O_{7}$$ that will be needed to react with one mole of $$H_{2}S$$ in acidic medium is :
  • $$\dfrac{1}{6}$$
  • $$\dfrac{1}{3}$$
  • $$\dfrac{2}{5}$$
  • $$\dfrac{2}{3}$$
Oxidation number of $$P$$ in $$PO^{3-}_4$$, of $$S$$ in $$SO^{2-}_4$$ and that of $$Cr$$ in $$Cr_2O^{2-}_7$$ are respectively:
  • +3, +6 and +6
  • +5, +6 and +6
  • +3, +6 and +5
  • +5, +3 and +6
Oxidation states of P in $$H_{4}P_{2}O_{5},H_{4}P_{2}O_{6},H_{4}P_{2}O_{7},$$ are respectively:
  • +3, +5, + 4
  • +5, +3, + 4
  • +5, +4, + 3
  • +3, +4, + 5
Oxidation state of Nitrogen in Nitrogen dioxide is:
  • $$+2$$
  • $$-2$$
  • $$+4$$
  • $$-4$$
The stability of $$+1$$ oxidation state increases in the sequence:
  • $$Ga < In < Al < Tl$$
  • $$Al < Ga < In < Tl$$
  • $$Tl < In < Ga < Al$$
  • $$In < Tl < Ga < Al$$
Carbon is in lowest oxidation state in :
  • $$HCOOH$$
  • $$HCHO$$
  • $$CF_4$$
  • $$CO_2$$
Among the following, the number of elements showing only one non-zero oxidation state is O, Cl, F, N, P, Sn, Tl, Na, Ti
  • 2
  • 8
  • 5
  • 9
Among the following, the species in which the oxidation number of an element is $$+6$$ is :
  • $$MnO_4^-$$
  • $$Cr(CN)_6^{3-}$$
  • $$NiF_6^{2-}$$
  • $$CrO_2Cl_2$$
For the redox reaction:
$$MnO_4^-+C_2O_4^{2-}+H^+\rightarrow Mn^{2+}+CO_2+H_2O$$
The correct coefficients of the reactants $$MnO_4^-, C_2O_4^{2-}$$ and $$H^+$$ for the balanced reaction are ____, ____ and ____ respectively.
  • $$2,\: 5,\: 16$$
  • $$16,\: 5,\: 2$$
  • $$5,\: 16,\: 2$$
  • $$2,\: 16,\: 5$$
Metals exhibit ..... oxidation states in their compounds.
  • Positive
  • Negative
  • Neutral
  • none of these
The number of moles of $$KMnO_4$$ that will be needed to react completely with one mole of ferrous oxalate in acidic medium is:
  • $$\dfrac {2}{5}$$
  • $$\dfrac {3}{5}$$
  • $$\dfrac {4}{5}$$
  • $$1$$
The number of moles of $$KMnO_4$$ that will be needed to react with one mole of sulphite ion in acidic solution is :
  • $$\dfrac {2}{5}$$
  • $$\dfrac {3}{5}$$
  • $$\dfrac {4}{5}$$
  • $$1$$
The oxidation number of manganese in $$KMnO_4$$ is +7.
Is the above statement true?
  • True
  • False
The oxidation state of $$Mn$$ in $$K_2MnO_4$$ is same as that in $$MnO_2$$.
Is the above statement true?
  • True
  • False
The oxidation number of $$Ni$$ in $$K_4[Ni(CN)_4]$$ is :
  • $$+1$$
  • $$+2$$
  • $$-1$$
  • $$0$$
What are the types of the following reactions?

$$3CrO_3^-+2 H^+ \rightarrow  2 Cr O_4^{-2} + Cr^{3+}+H_2O$$
  • Disproportionation
  • Combustion
  • Redox
  • Double displacement
Which of the following is a spectator ion in the reaction?
$$2Na+2HCl \rightarrow 2NaCl + H_2$$
  • $$Na^+$$
  • $$Cl^-$$
  • $$H^+$$
  • None of these
Which process is not involved in the reaction?

$$KO_2+H_2O+CO_2\rightarrow KHCO_3+O_2$$
  • Hydrolysis
  • Auto-redox
  • Acid-base reaction
  • Non redox change
In the reaction $$2Na_2S_2O_3 + I_2 \rightarrow Na_2S_4O_6 + 2 NaI$$, the oxidation state of sulphur is :
  • decreased
  • increased
  • unchanged
  • none of these
When $$SO_2$$ is passed in a solution of potassium iodate, the oxidation state of iodine changes from :
  • $$+5$$ to $$0$$
  • $$+5$$ to $$-1$$
  • $$-5$$ to $$0$$
  • $$-7$$ to $$-1$$
$${ Fe }^{ 2+ }$$ is oxidised by $$Mn{ O }_{ 4 }^{ - }$$ or $${ Cr }_{ 2 }{ O }_{ 7 }^{ 2- }$$ in acidic medium. What is new oxidation number of Fe?
  • $$+3$$
  • $$+1$$
  • $$+2$$
  • $$+4$$
The oxidation number of phosphorus in Ca(H2PO2)2Ca(H2PO2)2 is:
  • $$+3$$
  • $$+2$$
  • $$+1$$
  • $$-1$$
Among the following, identify the species with an atom in $$+4$$ oxidation state.
  • $$MnO^-_4$$
  • $$Cr(CN)_6^{3-}$$
  • $$NiF^{2-}_6$$
  • $$CrO_2Cl_2$$
Which of the following statements are correct?
  • Oxidation of a substance is followed by reduction of another.
  • Reduction of a substance is followed by oxidation of another.
  • Oxidation and reduction are complementary reactions.
  • It is not necessary that both oxidation and reduction should take place in the same reaction.
Which is the anhydride of $${HNO}_{3}$$ out of $${N}_{2}O,NO,{N}_{2}{O}_{5}$$?
  • $${N}_{2}{O}_{5}$$
  • $$NO$$
  • $${N}_{2}O$$
  • $${HNO}_{3}$$
Oxidation number of carbon and total number of atoms in carbon suboxide are :
  • $$+5, \:4$$
  • $$+\frac{4}{3},\:3$$
  • $$+\frac{4}{3},\: 5$$
  • $$+4,\: 5$$
Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen?
  • $$HNO_3, NO, NH_4Cl, N_2$$
  • $$HNO_3, NO, N_2, NH_4Cl$$
  • $$HNO_3, NH_4Cl, NO, N_2$$
  • $$NO, HNO_3, NH_4Cl, N_2$$
Choose the correct option regarding change in oxidation number of the underlined atom in the following conversion.

  $$2NaOH+\underline { Br_{ 2 } } \rightarrow NaBr+NaBrO+H_{ 2 }O$$
  • Decreases to $$-1$$ w.r.t $$NaBr$$ and increases to $$-3$$ w.r.t $$NaBrO$$
  • Decreases to $$-1$$ w.r.t $$NaBr$$ and increases to $$+2$$ w.r.t $$NaBrO$$
  • Decreases to $$-1$$ w.r.t $$NaBr$$ and increases to $$+1$$ w.r.t $$NaBrO$$
  • Decreases to $$-2$$ w.r.t $$NaBr$$ and increases to $$+1$$ w.r.t $$NaBrO$$
Which one of the following is not correct for the reaction?
$$(CN)_2 + H_2O \rightarrow HCN+ HOCN$$
  • It is an auto redox change.
  • Oxidation number of C in $$(CN)_2, HCN$$ and $$HOCN$$ are +3, +2 and +4 respectively.
  • Oxidation number of n in $$(CN)_2, HCN$$ and $$HOCN$$ are +3, +2 and +4 respectively.
  • The resultant solution is acidic.
Oxidation number of oxygen in superoxide ion, $${O}_{2}^{-}$$ is :
  • $$-2$$
  • $$-\cfrac{1}{2}$$
  • $$-\cfrac{3}{2}$$
  • none of these
Determine the oxidation state of the underlined element in $${ K }_{ 4 }\underline { { P }_{ 2 } } { O }_{ 7 }$$.
  • $$+5$$
  • $$+3$$
  • $$+4$$
  • $$+6$$
$${ K }_{ 3 }Cr{ \left( { O }_{ 2 } \right)  }_{ x }$$ has peroxy linkage with oxidation number of $$Cr$$ as $$+5$$. The value of $$x$$ is :
  • $$4$$
  • $$3$$
  • $$2$$
  • $$6$$
When $${Cl}^{-}$$ is converted into $${Cl}_{2}$$, change in oxidation number is :
  • $$3$$ units
  • $$1$$ units
  • $$2$$ units
  • none of these
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