CBSE Questions for Class 11 Medical Chemistry Redox Reactions Quiz 4 - MCQExams.com

To an acidic solution of an anion, a few drops of $$KMn{ O }_{ 4 }$$ solution are added. Which of the following, if present, will not decolourise the $$KMn{ O }_{ 4 }$$ solution?
  • $$C{ O }_{ 3 }^{ 2- }$$
  • $$N{ O }_{ 2 }^{ \ominus }$$
  • $${ S }^{ 2- }$$
  • $${ Cl }^{ \ominus }$$
A metal ion $${M}^{3+}$$ loses three electrons. Its oxidation number will be:
  • $$+3$$
  • $$+6$$
  • $$0$$
  • $$-3$$
The oxidation number of $$Cl$$ in $$CaO{Cl}_{2}$$ is :
  • $$-1$$ and $$+1$$
  • $$+2$$
  • $$-2$$
  • none
In which of the following compounds, the oxidation state of transition metal is zero?
  • $$Cr{ O }_{ 5 }$$
  • $${ Fe }_{ 3 }{ O }_{ 4 }$$
  • $$FeS{ O }_{ 4 }$$
  • $$Fe{ \left( CO \right) }_{ 5 }$$
In which of the following, the highest oxidation state is not possible?
  • $${ \left[ Xe{ O }_{ 6 } \right] }^{ 4- }$$
  • $$Xe{ F }_{ 8 }$$
  • $$Os{ O }_{ 4 }$$
  • $$Ru{ O }_{ 4 }$$
The oxidation state of iodine in $${ H }_{ 4 }I{ O }_{ 6 }^{ \ominus  }$$ is :
  • $$+7$$
  • $$-1$$
  • $$+5$$
  • $$+1$$
The oxidation states of sulphur in the anions $$S{ O }_{ 3 }^{ 2- },{ S }_{ 2 }{ O }_{ 4 }^{ 2- }$$ and $${ S }_{ 2 }{ O }_{ 6 }^{ 2- }$$ follow the order :
  • $${ S }_{ 2 }{ O }_{ 4 }^{ 2- } < S{ O }_{ 3 }^{ 2- } < { S }_{ 2 }{ O }_{ 6 }^{ 2- } $$
  • $$S{ O }_{ 3 }^{ 2- } < { S }_{ 2 }{ O }_{ 4 }^{ 2- } < { S }_{ 2 }{ O }_{ 6 }^{ 2- } $$
  • $${ S }_{ 2 }{ O }_{ 4 }^{ 2- } < { S }_{ 2 }{ O }_{ 6 }^{ 2- } < S{ O }_{ 3 }^{ 2- } $$
  • $${ S }_{ 2 }{ O }_{ 6 }^{ 2- } < { S }_{ 2 }{ O }_{ 4 }^{ 2- } < S{ O }_{ 3 }^{ 2- } $$
The oxidation number of underlined element in $$\displaystyle K\left [ \underline{Co}\left ( C_{2}O_{4} \right )_{2}.\left ( NH_{3} \right )_{2} \right ]$$ compound is :
  • $$+3$$
  • $$+2$$
  • $$+1$$
  • $$0$$
In $$\displaystyle HCN$$ oxidation number of carbon is?
  • +2
  • +3
  • +4
  • +1
$${? +O_2\rightarrow 2K_2O}$$
  • $$K$$
  • $${K_2}$$
  • $$2K$$
  • $$4K$$
Which of the following reactions is/ are not intermolecular redox reaction?
  • $$PbO_2+H_2O\rightarrow PbO+H_2O_2$$
  • $$2KClO_3\rightarrow 2KCl+3O_2$$
  • $$(NH_4)_2Cr_2O_7\rightarrow N_2+Cr_2O_3+4H_2O$$
  • $$NH_4NO_2\rightarrow N_2+2H_2O$$
Which of the following reactions is not oxidation-reduction reaction?
  • $$H^{\bigoplus}+OH^{\circleddash}\rightarrow H_2O$$
  • $$\displaystyle\frac{1}{2}H_2+\frac{1}{2}Cl_2\rightarrow HCl$$
  • $$CaCO_3\rightarrow CaO+CO_2$$
  • $$A$$ and $$C$$
The oxidation state of chromium in $$\left[ Cr{ \left( PP{ h }_{ 3 } \right)  }_{ 3 }{ \left( CO \right)  }_{ 3 } \right] $$ is :
  • $$+3$$
  • $$+8$$
  • $$0$$
  • $$+5$$
Which of the following leads to redox reaction?
  • $$AgN{ O }_{ 3 }+HCl$$
  • $$KOH+HCl$$
  • $$KI+{ Cl }_{ 2 }$$
  • $$N{ H }_{ 3 }+HCl$$
Which of the following reactions does not involve either oxidation or reduction?
  • $$V{ O }^{ 2+ }\longrightarrow { V }_{ 2 }{ O }_{ 3 }$$
  • $$Na\longrightarrow { Na }^{ \oplus }$$
  • $$Cr{ O }_{ 4 }^{ 2- }\longrightarrow { Cr }_{ 2 }{ O }_{ 7 }^{ 2- }$$
  • $${ Zn }^{ 2+ }\longrightarrow Zn$$
Find out oxidation state of $$Mn$$ in acid medium.
  • $$+5$$
  • $$+4$$
  • $$+2$$
  • $$+3$$
The oxidation number of $$C$$ in $$HNC$$ is :
  • +2
  • -3
  • +3
  • 0
The oxidation number of $$Fe$$ in $${ Na }_{ 2 }\left[ Fe{ \left( CN \right)  }_{ 5 }NO \right] $$ is :
  • +2
  • +1
  • +3
  • -2
The oxidation states of the most electronegative elements in the products of the reaction between $$Ba{O}_{2}$$ and $${H}_{2}S{O}_{4}$$ are, respectively :
  • $$0$$ and $$-1$$
  • $$-1$$ and $$-2$$
  • $$-2$$ and $$0$$
  • $$-2$$ and $$+1$$
The oxidation state of nitrogen is correctly given for:
  • $$\begin{matrix} Compound & Oxidation\quad state \\ \left[ CO{ \left( N{ H }_{ 3 } \right) }_{ 5 }Cl \right] { Cl }_{ 2 } & 0 \end{matrix}$$
  • $$\begin{matrix} Compound & Oxidation\quad state \\ N{ H }_{ 2 }OH & -2 \end{matrix}$$
  • $$\begin{matrix} Compound & Oxidation\quad state \\ { \left( { N }_{ 2 }{ H }_{ 5 } \right) }_{ 2 }S{ O }_{ 4 } & +2 \end{matrix}$$
  • $$\begin{matrix} Compound & Oxidation\quad state \\ { Mg }_{ 3 }{ N }_{ 2 } & -3 \end{matrix}$$
Among the following, identify the species with an atom in $$+6$$ oxidation state.
  • $$Mn{ O }_{ 4 }^{ \ominus }$$
  • $${ \left[ Cr{ \left( CN \right) }_{ 6 } \right] }^{ 3- }$$
  • $${ \left[ Ni{ F }_{ 6 } \right] }^{ 2- }$$
  • $$Cr{ O }_{ 2 }{ Cl }_{ 2 }$$
Which one of the following statements is not correct?
  • Oxidation number of $$S$$ in $$(NH_4)_2S_2O_8$$ is $$+6$$.
  • Oxidation number of $$Os$$ in $$OsO_4$$ is $$+8$$.
  • Oxidation number of $$S$$ in $$H_2SO_5$$ is $$+8$$.
  • Oxidation number of $$O$$ in $$KO_2$$ is $$-\frac{1}{2}$$.
Oxidation number of $$S$$ in $${S_2O_3}^{2-}$$ is:
  • -2
  • +2
  • +6
  • 0
Which of the following compounds has phosphorus atom in $$+1 $$ oxidation state?
  • $$H_3PO_3$$
  • $$H_3PO_4$$
  • $$H_3PO_2$$
  • $$H_4P_2O_7$$
In $$FeCr_2O_4$$ the oxidation numbers of Fe and Cr are:
  • + 2 and + 3
  • 0 and +2
  • +2 and +6
  • +3 and +6
A balanced chemical equation is in accordance with:
  • Avogadro's Law
  • Law of constant proportion
  • Law of conservation of mass
  • Law of gaseous volumes
Determine the. oxidation state of chromium in the finfll product formed by the reaction between KI and acidified potassium dichromate solution.
  • + 3
  • +2
  • +1
  • -3
Identify X in the equation given below. $$FeCl_3 + SO_2 + H_2O \rightarrow FeCl_2 + HCl + X$$
  • $$H_2 S$$
  • $$SO_3$$
  • $$H_2SO_4$$
  • $$H_2SO_3$$
The reaction $$ZnO + C \rightarrow Zn+ CO$$ is an example of a
  • Combination reaction
  • Reduction-oxidation reaction
  • Displacement reaction
  • Decomposition Reaction
Sulphur dioxide bleaches colouring matter by ___________.
  • dehydration
  • oxidation
  • decomposition
  • reduction
When an oxidising agent reacts, it consumes electrons. In the following changes, which one of the oxidising agents has consumed maximum number of electrons per mole?
  • $$Cr{O}_{4}^{2-}\longrightarrow {Cr}^{3+}$$
  • $$Mn{O}_{2}\longrightarrow {Mn}^{3+}$$
  • $$Mn{O}_{4}^{2-}\longrightarrow {Mn}^{2+}$$
  • $$Mn{O}_{4}^{-}\longrightarrow {Mn}^{2+}$$
Identify redox reaction among the following:
  • acid-base neutralization
  • precipitation reaction
  • metal displacement reaction
  • all the above
Which one 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 carbon and total number atoms in carbon suboxide are, respectively :
  • $$+5, \:4$$
  • $$+\frac{4}{3},\:3$$
  • $$+\frac{4}{3},\: 5$$
  • $$+4,\: 5$$
The oxidation state of $$Cr$$ in $$K_{2}Cr_{2}O_{7}$$ is:
  • $$+4$$
  • $$+3$$
  • $$+6$$
  • $$+5$$
The oxidation states of iodine in $$HIO_{4}, H_{3}IO_{5}$$ and $$H_{5}IO_{6}$$ are respectively
  • $$+1, +3, +7$$
  • $$+7, +7, +3$$
  • $$+7, +7, +7$$
  • $$+7, +5, +3$$
In which of the following compounds, nitrogen exhibits highest oxidation state ? 
  • $$N_3H$$
  • $$NH_2OH$$
  • $$ N_2H_4$$
  • $$NH_3$$
The oxidation number of C atom in $$CH_{2}Cl_{2}$$ and $$CCl_{4}$$ are respectively :
  • $$-2$$ and $$-4$$
  • $$0$$ and $$-4$$
  • $$0$$ and $$4$$
  • $$2$$ and $$4$$
Identify the strongest acids out of the following list.
  • $$HBr{O}_{4}$$
  • $$HOCl$$
  • $$H{NO}_{2}$$
  • $${H}_{3}{PO}_{3}$$
The oxidation number of $$Cr$$ in $$K_{2}Cr_{2}O_{7}$$ is :
  • $$+3$$
  • $$-3$$
  • $$+6$$
  • $$-6$$
In the reaction $$2Cr + 3Ni^{2+}\rightarrow  3Ni + 2Cr^{3+}$$, the species oxidized is:
  • $$Cr$$
  • $$Ni^{2+}$$
  • $$Cr^{3+}$$
  • $$Ni$$
  • none of the above
Which one of the following have the highest oxidation number for chlorine?
  • $$HClO_{2}$$
  • $$KClO_{3}$$
  • $$HCl$$ 
  • $$KClO_{4}$$
  • $$CaCl_{2}$$
The reducing agent in the reaction $$Al + Fe^{3+}\rightarrow Al^{3+}+ Fe$$ is:
  • $$Fe$$
  • $$Al$$
  • $$Al^{3+}$$
  • $$Fe^{3+}$$
  • none of the above
A compound contains $$X, Y\ and\ Z$$ atoms. The oxidation states of $$X, Y\ and\ Z$$ are $$+2, + 2\ and\ -2$$ respectively. The possible formula of the compound is:
  • $$XYZ_2$$
  • $$Y_2(XZ_3)_2$$
  • $$X_3(Y_4Z)_2$$
  • $$X_3(YZ_4)_3 $$
Potassium dichromate is a good oxidising agent in acidic medium, the oxidation state of chromium changes by :
  • 2
  • 3
  • 4
  • 5
In $$KH$$, the oxidation number of hydrogen is:
  • $$+2$$
  • $$+1$$
  • $$0$$
  • $$-1$$
  • $$-2$$
Among the following, the correct order of acidity is
  • $$HClO_{3} < HClO_{4} < HClO_{2} < HClO$$
  • $$HClO < HClO_{2} < HClO_{3} < HClO_{4}$$
  • $$HClO_{2} < HClO < HClO_{3} < HClO_{4}$$
  • $$HClO_{4} < HClO_{2} < HClO < HClO_{3}$$
The sum of the coefficients in the balanced equation of $$Co + Ni^{2+} \rightarrow Co^{3+} + Ni$$, is:
  • $$5$$
  • $$2$$
  • $$3$$
  • $$10$$
  • $$13$$

Statement 1: Addition of the oxidation numbers of all the elements in the formula of a compound must be 0.
Statement 2: Generally oxidation number of oxygen is -2 for most of the compounds.

  • Both the statements 1 and 2 are correct and statement 2 is not correct explanation of statement 1.

  • Both the statements 1 and 2 are correct.

  • Both the statements 1 and 2 are correct and statement 2 is correct explanation of statement 1.

  • Statement 1 is not correct but statement 2 is correct.

  • Statement 1 is correct but statement 2 is not correct.

What is the oxidation state of calcium in calcium carbonate ($$\displaystyle \ { Ca } { CO }_{ 3 }$$)?
  • +6
  • +5
  • +4
  • +1
  • +2
0:0:1


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