CBSE Questions for Class 11 Medical Chemistry Redox Reactions Quiz 7 - MCQExams.com

The oxidation state of the underlined element in the given compound is:
$$Na_2[\ \underline{Fe}(CN)_5NO\ ]$$
  • -2
  • +2
  • +3
  • none of these
The oxidation state of the underlined element in the given compound is:
$$Ba_2\underline{Xe}O_2$$
  • +2
  • +3
  • +4
  • 0
The oxidation state of the underlined element in the given compound is:
$$\underline{Ru}O_4$$
  • +8
  • +6
  • +4
  • none of these
The oxidation state of the underlined element in the given compound is:
$$K_2\underline{Ta}F_7$$
  • +7
  • +4
  • +5
  • +1
Which of the following has been arranged in order of increasing oxidation number of nitrogen?
  • $$NH_3 < N_2O_5 < NO < N_2$$
  • $$NO^+_2 < NO^-_3 < NO^-_2 < N^-_3$$
  • $$NH^+_4 < N_2H_4 < NH_2OH < N_2O$$
  • $$NO_2 < NaN_3 < NH^+_4 < N_2O$$
The oxidation number of nitrogen atoms in $$NH_4NO_3$$ are:
  • $$+3, +3$$
  • $$+3, -3$$
  • $$-3, +5$$
  • $$-5, +3$$
The oxidation states of sulphur in Caro's and Marshall's acid are:
  • $$+6, +6$$
  • $$+4, +6$$
  • $$+6, -6$$
  • $$+6, +4$$
Oxidation state(s) of chlorine in $$CaOCl_2$$(bleaching powder) is/are?
  • $$+1$$ and $$-1$$
  • $$+1$$ only
  • $$-1$$ only
  • None of these
Oxidation states of carbon atoms in diamond and graphite are.
  • $$+2, +4$$
  • $$+4, +2$$
  • $$-4, 4$$
  • Zero, zero
Oxidation number of $$C$$ in $$HCCOH$$ is________.
  • $$+2$$
  • $$+4$$
  • $$+3$$
  • $$0$$
Oxidation number of sulphur in $$S_8, S_2F_2$$ and $$H_2S$$ are:
  • $$+2, 0, +2$$
  • $$0, +1, -2$$
  • $$-2, 0, +2$$
  • $$0, +1, +2$$
In the ethylene molecule the two carbon atoms have the oxidation numbers.
  • $$-1, -1$$
  • $$-2, -2$$
  • $$-1, -2$$
  • $$+2, -2$$
Oxalic acid dihydrate, $$H_{2}C_{2}O_{4}\cdot 2H_{2}O(s)$$ is often used as a primary reagent to standardise sodium hydroxide solution. Which of these facts are reasons to choose this substance as a primary standard?
I. It is diprotic.
II. It is a stable compound that can be weighed directly in air.
III. It is available in pure form.
  • III only
  • I and II only
  • II and III only
  • I, II and III
Select the species having zero oxidation state at the underlined elements.
  • $$(CH_3)_2\underset{-}{S}O$$
  • $$\underline{C}_{12}H_{22}O_{11}$$
  • $$H_2\underset{-}{S}O_3$$
  • $$\underline{N }_2H_4$$
Which of the following have been arrange in order of decreasing oxidation number of sulphur?
  • $$Na_{2}S_{4}O_{6} > H_{2}S_{2}O_{7} > Na_2S_2O_3 > S_8$$
  • $$SO_{2}^{+} > SO^{2-}_4 > SO^{2-}_3 > HSO^-_4$$
  • $$H_2SO_5 > H_2SO_3 > SCl_2 > H_2S$$
  • $$H_2SO_4 > SO_2 > H_2S > H_2S_2O_8$$
The oxidation number of Cr is $$+6$$ in_______________.
  • $$FeCr_2O_4$$
  • $$KCrO_3Cl$$
  • $$CrO_5$$
  • $$[Cr(OH)_4]^-$$
Which among the following are auto redox reactions?
  • $$P_4+OH^-\rightarrow H_2PO^-_4+PH_3$$
  • $$S_2O^{2-}_3\rightarrow SO^{2-}_4+S$$
  • $$H_2O_2\rightarrow H_2O+O_2$$
  • $$AgCl+NH_3\rightarrow [Ag(NH_3)_2]Cl$$
The sum of oxidation number of nitrogen in $$NH_4NO_3$$ is:
  • +1
  • +2
  • +4
  • none of these
$${MnO_{4}}^{-}$$ ions are reduced in acidic condition to $$Mn^{2+}$$ ions whereas they are reduced in neutral condition to $$MnO_{2}$$. The oxidation of $$25\ mL$$ of a solution $$X$$ containing $$Fe^{2+}$$ ions required in acidic condition, $$20\ mL$$ of a solution $$Y$$ containing $${MnO_{4}}^{-}$$ ions. What volume of solution $$Y$$ would be required to oxidise $$25\ mL$$ of solution $$X$$ containing $$Fe^{2+}$$ ions in neutral condition?
  • $$11.4\ mL$$
  • $$12\ mL$$
  • $$33.3\ mL$$
  • $$35\ mL$$
The oxidation number of carbon is zero in_____________.
  • HCHO
  • $$CH_2Cl_2$$
  • $$C_6H_{12}O_6$$
  • $$C_{12}H_{22}O_{11}$$
The value of n in the molecular formula $$Be_nAl_2Si_6O_{18}$$ is:
  • 1
  • 2
  • 3
  • 4
Of the following reactions, only one is a redox reaction. Identify this reaction.
  • $$Ca{ \left( OH \right) }_{ 2 }+2HCl\longrightarrow Ca{ Cl }_{ 2 }+2{ H }_{ 2 }O$$
  • $$2{ S }_{ 2 }{ O }_{ 7 }^{ 2- }+2{ H }_{ 2 }O\longrightarrow 2S{ O }_{ 4 }^{ 2- }+4{ H }^{ + }$$
  • $$Ba{ Cl }_{ 2 }+MgS{ O }_{ 4 }\longrightarrow BaS{ O }_{ 4 }+Mg{ Cl }_{ 2 }$$
  • $${ Cu }_{ 2 }S+2FeO\longrightarrow 2Cu+2Fe+S{ O }_{ 2 }$$
The oxidation number of cobalt in $$K[Co(CO)_4]$$ is:
  • $$-1$$
  • $$-3$$
  • $$+1$$
  • $$+3$$
Which of the statement is correct?
  • The oxidation state of iron in $$Na_2[Fe(CN)_5NO]$$ is +2
  • $$[Ag(NH_3)_2]^+$$ linear in shape
  • In $$[Fe(H_2O)_6]^{3+}$$, Fe is $$sp^2d^2$$ hybridised
  • In $$[Co(H_2O)_6]^{3+}$$, Co is $$d^2sp^3$$ hybridised.
Which one of the following leads to redox reaction?
  • $$AgN{ O }_{ 3 }+HCl$$
  • $$KOH+HCl$$
  • $$KI+{ Cl }_{ 2 }$$
  • $${ NH }_{ 3 }+HCl\quad $$
The oxidation number of sulphur in $$H_2S_2O_8$$ is:
  • $$+2$$
  • $$+4$$
  • $$+6$$
  • $$+7$$
The oxidation state of central atom in the anion of compound $$NaH_2PO_2$$ will be:
  • $$-3$$
  • $$+1$$
  • $$+3$$
  • $$+5$$
The oxidation states of P atom in $$POCl_3, H_2PO_3$$ and $$H_4P_2O_6$$, respectively are:
  • $$+5, +4, +4$$
  • $$+5, +5, +4$$
  • $$+4, +4, +5$$
  • $$+3, +4, +5$$
Oxidation number of $$'N'$$ in $$N_3H$$ (hydrazoic acid) is:
  • $$-\cfrac{1}{3}$$
  • $$+3$$
  • $$0$$
  • $$-3$$
In Redox reaction:
$$Fe + HNO_{3}\rightarrow Fe(NO_{3})_{2} + NH_{4}NO_{3} + H_{2}O$$ the coefficient of $$HNO_{3}, Fe(NO_{3})_{2}, NH_{4}NO_{3}$$ is:
  • $$1 : 10 : 4$$
  • $$10 : 4 : 1$$
  • $$4:10:4$$
  • $$4:1:4$$
The oxidation number of iron in potassium ferricyanide $$[K_{3}Fe(CN)_{6}]$$ is :
  • Two
  • Six
  • Three
  • None
When benzaldehyde is oxidised to give benzoic acid then the oxidation state of carbon of aldehydic group is changed from:
  • $$+2$$ to $$+3$$
  • $$+1$$ to $$+3$$
  • Zero to $$+2$$
  • No change
The reaction which proceeds in the forward direction is:
  • $$Fe_3O_4 + 6HCl \rightarrow2 FeCl_3 + 3H_2O$$
  • $$NH_3 + H_2O + NaCl\rightarrow NH_4Cl + NaOH$$
  • $$SnCl_4 +Hg_2Cl_2\rightarrow SnCl_2 + 2HgCl_2$$
  • $$2CuI + I_2 + 4 K^+ \rightarrow 2 Cu^{2+} + 4 KI$$
Oxidation number of P in $$Ba\, (H_2PO_2)_2$$ is:
  • +3
  • +2
  • +1
  • -1
In which of the following, the oxidation number of oxygen has been arranged in increasing order?
  • $$BaO_{2} < KO_{2} < O_{3} < OF_{2}$$
  • $$OF_{2} < KO_{2} < BaO_{2} < O_{3}$$
  • $$BaO_{2} < O_{3} < OF_{2} < KO_{2}$$
  • $$KO_{2} < OF_{2} < O_{3} < BaO_{2}$$
Which of the following elements never show positive oxidation number?
  • $$O$$
  • $$Fe$$
  • $$Ga$$
  • $$F$$
The sum of the oxidation states of all the carbon atoms present in the compound $$C_{6}H_{5}CHO$$ is:
  • $$-4$$
  • $$3$$
  • $$+5$$
  • $$-4/7$$
Minerals associated with  redox reactions are
  • Na, Cu
  • N, Cu
  • Fe, Cu
  • Ca, Fe
The ratio of number of moles of $$KMnO_4$$ and $$K_2Cr_2O_7$$ required to oxidise $$0.1$$mol $$Sn^{+4}$$ in acidic medium :
  • $$6 : 5$$
  • $$5 : 6$$
  • $$1 : 2$$
  • $$2 : 1$$
The pair of compounds in which the metals are in their highest oxidation state is:
  • $$MnO_2, FeCl_3$$
  • $$Mn{ O }_{ 4 }^{ - }, CrO_2Cl_2$$
  • $$MnCl_2 , CrCl_3$$
  • $$[NiCl_4]^{2-}, [ CoCl_4]^-$$
The element that does not show positive oxidation state is:
  • $$O$$
  • $$N$$
  • $$Cl$$
  • $$F$$

Which of the following shows highest oxidation number in combined state?
  • $$Os$$
  • $$Ru$$
  • Both (1) & (2)
  • None
Carbon is in the lowest oxidation state in:
  • $$CH_4$$
  • $$CCl_4$$
  • $$CF_4$$
  • $$CO_2$$
Which compound amongst the following has the highest oxidation number of $$Mn$$?
  • $$KMnO_4$$
  • $$K_2MnO_4$$
  • $$MnO_2$$
  • $$Mn_2O_3$$
Which of the following is a decreasing order of oxidation states of the central atoms?
  • $$PCl_5 , HIO_4, Cl_2{ O }_{ 7 }^{ 2- },Cl_2O$$
  • $$Cr_2{ O }_{ 7 }^{ 2- }, Cl_2O, HIO_4, PCl_5$$
  • $$HIO_4, Cr_2{ O }_{ 7 }^{ 2- }, PCI_5,Cl_2O$$
  • $$Cr_2{ O }_{ 7 }^{ 2- }, HIO_4,Cl_2O,PCl_5$$
Various oxidation states of few elements are mentioned, Which of the options is not correctly matched?
  • Phosphorus : +3 to +5
  • Nitrogen : +1 to +5
  • Iodine : -1 to +7
  • Chromium : -3 to +6
Choose the redox reaction from the following.
  • $$Cu+2H_2SO_4 \rightarrow CuSO_4+SO_2+2H_2O$$
  • $$BaCl_2+H_2SO_4 \rightarrow BaSO_4+2HCl$$
  • $$2NaOH+H_2SO_4 \rightarrow Na_2SO_4+2H_2O$$
  • $$KNO_2+H_2SO_4 \rightarrow 2HNO_2+K_2SO_4$$
The oxidation number of nitrogen in $$ ( N_2H_5)^+$$ is:
  • -2
  • +2
  • +3
  • -3
Which is not true about the oxidation state of the following elements?
  • Sulphur +6 to -2
  • Carbon +4 to -4
  • Chlorine +7 to -1
  • Nitrogen +3 to -1
Which compound among the following has lowest oxidation number of chlorine?
  • $$HClO_4$$
  • $$HClO_3$$
  • $$HCl$$
  • $$HOCl$$
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 11 Medical Chemistry Quiz Questions and Answers