CBSE Questions for Class 11 Medical Chemistry Redox Reactions Quiz 1 - MCQExams.com

The oxidation number of sulphur is -4 in
  • $${{\text{H}}_{\text{2}}}{\text{S}}\,\,\,$$
  • $$\,{\text{C}}{{\text{S}}_{\text{2}}}\,\,\,$$
  • $$\,{\text{N}}{{\text{a}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}\,$$
  • $${\text{N}}{{\text{a}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{3}}}$$
What are the oxidation numbers of '$$N$$' in $${ NH }_{ 4 }N{ O }_{ 3 }$$?
  • +3 , -5
  • -3, +5
  • +3, +6
  • -2, +2
Is the compounds is according to decreasing order of the oxidation state of nitrogen?
$$HNO_3$$>$$ NO$$>$$N_2$$> $$NH_4Cl$$
  • True
  • False
In the reaction : $$xBrO_{3}^{-}+yCr^{3+}+zH_{2}O\rightarrow Br_{2}+CrO_{4}^{2-}+H^{+}$$
The coefficient $$x,\ y$$ and $$z$$ are:
  • $$6,10,11$$
  • $$6,10,20$$
  • $$6,8,22$$
  • $$6,10,22$$
$$CrO^{2-}_4 \overset{pH=x}{\rightarrow}Cr_2O^{2-}_7 \overset{pH=y}{\rightarrow}CrO^{2-}_4$$.
x and y can be 
  • 3 and 5
  • 3 and 8
  • 8 and 3
  • 8 and 11
Oxygen exhibit $$-1$$ oxidation state in:
  • $$OF_{2}$$
  • $$H_{2}O_{2}$$
  • $$HC1O$$
  • $$H_{2}O$$
Which is not redox change ?
  • $$CaCO_{3} \rightarrow CaO+CO_{2}$$
  • $$2H_{2}+O_{2} \rightarrow 2H_{2}O$$
  • $$Na+H_{2}O \rightarrow NaOH+\dfrac{1}{2} H_{2}$$
  • $$MnCI_{3} \rightarrow MnCI_{2}+\dfrac{1}{2} CI_{2}$$
(i) $$Br_2+2NaOH[cold] \rightarrow NaBr+(X)+H_2O$$
(ii) $$2Br_2+6NaOH[hot]\rightarrow NaBr+(Y)+H_2O$$

What is the oxidation number of $$Br$$ in $$(X)$$ and $$(Y)$$ respectively?
  • $$+1,+7$$
  • $$+1,+5$$
  • $$+4,+5$$
  • None of these
Identify the element that can have only two oxidation states.
  • Hydrogen
  • Fluorine
  • Carbon
  • Chromium
The highest oxidation state of Mn is shown by
  • $${{\rm{K}}_{\rm{2}}}{\rm{Mn}}{{\rm{O}}_4}$$
  • $${\rm{KMn}}{{\rm{O}}_4}$$
  • $${\rm{Mn}}{{\rm{O}}_2}$$
  • $${\rm{M}}{{\rm{n}}_2}{{\rm{O}}_3}$$
Which of the following has lowest oxidation state?
  • $${{\text{K}}_{\text{2}}}{\text{Fe}}{{\text{O}}_{\text{4}}}$$
  • $${{\text{K}}_{\text{4}}}{\text{Fe}}{\left( {{\text{CN}}} \right)_{\text{6}}}$$
  • $${\text{F}}{{\text{e}}_{\text{2}}}{{\text{O}}_{\text{3}}}$$
  • $${\text{Fe}}{\left( {{\text{CO}}} \right)_{\text{5}}}$$
The oxidation state of cobalt in 
1359998_4be83159a34f49598b0410a877394ed1.PNG
  • 2
  • 3
  • 4
  • 6
The oxidation state of tungsten in $$N{a_2}{W_4}{O_{13}}.10{H_2}O$$ is 
  • +4
  • +6
  • +7
  • +5
The oxidation state of the underlined element in the given compound is:
$$\underline{Ba}Cl_2$$
  • +2
  • -2
  • 0
  • none of these
The correct statement for the molecule $$ CsI_{3}$$ is that:
  • it contains $$ Cs^{3+}$$ and $$ I^{-}$$ ions
  • it contains $$ Cs^{+}, I^{-}$$ and lattice $$ I_{2}$$ molecule
  • it is a covalent molecule
  • it contains $$ Cs^{+}$$ and $$ I_{3}{^-}$$ ions
The pair of compounds having metals in their highest oxidation state is:
  • $$[Fe(CN)_6]^{3-}$$ and $$[Cu(CN)_4]^{2-}$$
  • $$MnO_2$$ and $$CrO_2Cl_2$$
  • $$[FeCl_4]^-$$ and $$Co_2O_3$$
  • $$[NiCl_4]^{2-}$$ and $$[CoCl_4]^{2-}$$
The correct order of acid strength is.
  • $$HClO < HClO_2 < HClO_3 < HClO_4$$
  • $$HClO_4 < HClO < HClO_2 < HClO_3$$
  • $$HClO_2 < HClO_3 < HClO_4 < HClO$$
  • $$HClO_4 < HClO_3 < HClO_2 < HClO$$
Identify Z in the reaction given below:

$$2Mn{ O}^-_4+5H_2O_2+6H^+\rightarrow 2Z+5O_2+8H_2O$$
  • $$Mn^{2+}$$
  • $$Mn^{4+}$$
  • $$Mn$$
  • $$MnO_2$$

The characteristic oxidation number of atoms in free metals is:               
  • $$-1$$
  • $$+1$$
  • any number
  • 0
The brown ring complex compound is formulated as $$[Fe(H_2O)_5(NO)]SO_4$$. The oxidation state of iron is:
  • $$+1$$
  • $$+2$$
  • $$+3$$
  • Zero
What is the oxidation number of lithium in $$LiCl$$?
  • $$+3$$
  • $$-1$$
  • $$+1$$
  • $$0$$
What is the oxidation number of $$O$$ in a diatomic molecule $$({O}_{2})$$?
  • $$+2$$
  • $$\pm 2$$
  • $$+8$$
  • $$0$$
Oxidation state of iodine in $$I Cl_{2}^{-}$$ is :
  • + 1
  • - 1
  • + 2
  • - 2
A redox reaction is one in which:
  • both the substance are reduced.
  • both the substance are oxidised.
  • one substance is reduced and other is oxidised.
  • all of the above.
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 -
  • $$S_{2}O_{4}^{2-} < SO_{3}^{2-} < S_{2}O_{6}^{2-}$$
  • $$SO_{3}^{2-} < S_{2}O_{4}^{2-} < S_{2}O_{6}^{2-}$$
  • $$S_{2}O_{4}^{2-} < S_{2}O_{6}^{2-} < SO_{3}^{2-}$$
  • $$S_{2}O_{6}^{2-} < S_{2}O_{4}^{2-} < SO_{3}^{2-}$$
$$2Al_2O_3\rightarrow Al_2O_3+2H_2O$$ is a balanced chemical equation.
Is the above reaction correct?
  • True
  • False
Oxidation state of Fe in $$Fe_{0.94} O_1$$ is?
  • 200
  • $$\dfrac{200}{94}$$
  • $$\dfrac{94}{200}$$
  • none of these
The oxidation state of the underlined element in the given compound is:
$$\underline{I}F_7$$
  • +5
  • +7
  • +6
  • none of these
What is the oxidation number of sulfur in $$H_2S$$?
  • +1
  • +2
  • -2
  • -1
The brown ring complex compound is formulated as $$[Fe(H_{2}O)_{5}(NO)]SO_{4}$$. The oxidation state of iron in this complex is:
  • $$0$$
  • $$+1$$
  • $$+2$$
  • $$+3$$

$$ Cu(S) + 2Ag^{+}(aq) \rightarrow Cu^{2+}(aq)+2Ag(S) $$

In the given reaction, the reduction half cell reaction is:
  • $$Cu$$ $$^{2+}$$ $$+$$ $$2e$$$$^{-}$$ $$\rightarrow $$ $$Cu$$
  • $$Cu$$ $$-$$ $$2e$$ $$^{-}$$$$\rightarrow $$$$Cu$$$$^{2+}$$
  • $$Ag$$ $$^{+}$$ $$+$$  e$$^{-}$$$$\rightarrow $$ $$Ag$$
  • $$Ag$$  $$-$$  $$e$$ $$^{-}$$$$\rightarrow $$ $$Ag$$ $$^{+}$$
Oxidation number of $$Fe$$ in $$Na_2[Fe(CN)_{5}(NO)].2H_{2}O$$ is____________.
  • $$-2$$
  • $$+1$$
  • $$+3$$
  • $$+5$$
In which of the following, iron is present in its lowest oxidation state?
  • $$FeSO_{4}.7H_{2}O$$
  • $$Fe(CO)_{5}$$
  • $$Fe_{0.94}O$$
  • $$Fe_{3}O_{4}$$
The oxidation state of phosphorus is maximum in_________.
  • phospine $$(PH_{3})$$
  • diphosphine $$(P_{2}H_{4})$$
  • metaphosphoric acid $$(HPO_{3})$$
  • phosphorus acid $$(H_{3}PO_{3})$$
A half cell reaction is one which:
  • involves only half a mole of electrolyte
  • goes only half way to completion
  • takes place at one electrode
  • consumes half a unit of electricity
Oxidation state of nitrogen is not an integer in:
  • hydroxyl amine $$(NH_{2}OH)$$
  • ammonia $$(NH_{3})$$
  • hydrazine $$(N_{2}H_{4})$$
  • hydrazoic acid $$(N_{3}H)$$
The oxidation state of oxygen is maximum in_________.
  • bleaching powder $$(CaOCl_{2})$$
  • oxygen difluoride $$(OF_{2})$$
  • dioxygen difluoride $$(O_{2}F_{2})$$
  • hydrogen peroxide $$(H_{2}O_{2})$$
The oxidation state of the metal atom is zero in:
  • ferrous sulphate
  • ferric sulphate
  • rust
  • iron carbonyl
The oxidation number of chlorine is maximum in __________.
  • $$HOCl$$
  • $$Cl_{2}O_{6}$$
  • $$KClO_{4}$$
  • $$NaClO_{3}$$
Oxidation number of sulphur in marshall's acid $$(H_{2}S_{2}O_{8})$$ is
  • $$+5$$
  • $$+8$$
  • $$+6$$
  • $$+7$$
The oxidation number of manganese in $$ KMnO_{4}$$ is:
  • $$+3$$
  • $$+5$$
  • $$+7$$
  • $$+9$$
Oxidation number of $$Cr$$ in $$KCrO_{4}^-$$ is:
  • $$+4$$
  • $$+6$$
  • $$+2$$
  • $$+8$$
The oxidation number of manganese in potassium manganate is:
  • $$+7$$
  • $$+6$$
  • $$+4$$
  • $$+2$$
In which of the following compounds, sulphur atom has different oxidation number?
  • $$H_{2}SO_{4}$$
  • $$HSO_{3}^-$$
  • $$SO_{2}Cl_{2}$$
  • $$SO_{3}$$
In calcium hypophosphite, oxidation number of phosphorus is
  • $$0$$
  • $$+1$$
  • $$+3$$
  • $$+5$$
In which of the following substances, sulphur has the lowest oxidation number?
  • $$H_{2}SO_{4}$$
  • $$SO_{2}$$
  • $$H_{2}SO_{3}$$
  • $$H_{2}S$$
Oxidation number of sulphur in Caros acid $$(H_{2}SO_{5})$$ is:
  • $$+5$$
  • $$+8$$
  • $$+6$$
  • $$+7$$
Oxidation number of carbon in $$SCN^{-}$$ ion is
  • $$+2$$
  • $$-2$$
  • $$+4$$
  • $$-4$$
The sum of the oxidation number of the carbon atoms in $$CH_{3} CHO$$ is:
  • $$+2$$
  • $$-4$$
  • $$-1$$
  • $$-2$$
Which of the following change is neither oxidation nor reduction?
  • $$K_{2}Cr_{2}O_{7}$$ to $$K_{2}CrO_{4}$$
  • $$Na_{2}SO_{4}$$ to $$NaHSO_{4}$$
  • $$CuCl_{2}$$ to $$CuSO_{4}$$
  • All the above
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