CBSE Questions for Class 11 Medical Chemistry Redox Reactions Quiz 5 - MCQExams.com

Oxidation state of phosphorous in $$\displaystyle \ { P } { O }_{ 4 }^{ 3- }$$ is:
  • +2
  • +5
  • +4
  • +1
  • none of the above
$$Cl_2(g)+2Br^-(excess)\rightarrow $$
What are the final product of the above reaction equation?
  • $$1$$ mol of $$Cl^-$$ ions and $$1$$ mol of $$Br^-$$
  • $$1$$ mol of $$Cl^-$$ ions and $$2$$ mol of $$Br^-$$
  • $$1$$ mol of $$Cl^-$$ ions and $$1$$ mol of $$Br_2$$
  • $$2$$ mol of $$Cl^-$$ ions and $$1$$ mol of $$Br_2$$
  • $$2$$ mol of $$Cl^-$$ ions and $$2$$ mol of $$Br_2$$
The oxidation number of sulfur in $$H_2SO_4$$ is :
  • $$+2$$
  • $$+3$$
  • $$+4$$
  • $$+6$$
  • $$+8$$
Consider $$\displaystyle { Mg\left(  { H } { CO }_{ 3 } \right)  }_{ 2 }$$ and choose the correct option.
  • Oxidation state of hydrogen is +5
  • Oxidation state of carbon is +1
  • Oxidation state of hydrogen is +1
  • Oxidation state of hydrogen is +4
  • None of the above
What is the oxidation state of sulphur in $$\displaystyle { Na }_{ 2 }\ { { S }_{ 2 } } { O }_{ 3 }$$?
  • +2
  • +4
  • +1
  • +5
  • +6
Zn(s)|ZnCl$$_2$$(aq)|Cl$$^-$$(aq)|Cl$$_2$$(g)|C(s)
According to the above cell diagram the electrochemical cell described, the reaction at anode is :
  • Zn $$\rightarrow$$ Zn$$^{2+}$$ + 2e$$^-$$
  • Zn$$^{2+}$$ + 2e$$^-$$ $$\rightarrow$$ Zn
  • Cl$$_2$$ + 2e$$^-$$ $$\rightarrow$$ 2Cl$$^-$$
  • 2Cl$$^-$$ $$\rightarrow$$ Cl$$_2$$ + 2e$$^-$$
  • Zn + Cl$$_2$$ $$\rightarrow$$ ZnCl$$_2$$
Oxidation state for the underlined atom in $$\displaystyle { K }_{ 2 }\underline { Cr } { O }_{ 4 }$$ is:
  • +4
  • +6
  • +2
  • +5
  • +1
The formation of nitrous oxide from nitrogen and oxygen is the example for
  • Decomposition reaction
  • Chemical combination of one element and one compound
  • Chemical combination of two compounds
  • Chemical combination of two elements
What is the oxidation number of each atom in KH?
  • +1, -1
  • -1, +1
  • -1, -1
  • +1,+1
  • Not enough information given.
When tin(IV) chloride is treated with excess of conc. hydrochloric acid, the complex ion$$(SnCl_6)^{2-}$$ is formed. The oxidation state of tin in this complex ion is?
  • $$+4$$
  • zero
  • $$-2$$
  • $$-4$$
The oxidation states exhibited by hydrogen in its various molecular forms/compounds are :
  • -1 only
  • zero only
  • +1,-1 and 0
  • +1 only
"Nitric oxide reacts with oxygen to form reddish brown nitrogen dioxide gas". Choose the correct equation for the above reaction
  • $$2NO + O_{2} \rightarrow 2NO_{2}$$
  • $$N_{2}O + O_{2} \rightarrow NO_{2} + NO$$
  • $$NaNO_{3} \xrightarrow {heat} 2NaNO_{2} + O_{2}$$
  • $$2NO_{3} + O_{2} \rightarrow 2NO_{2} + 2O_{2}$$
"Reaction of potassium iodide solution with lead nitrate solution" is the example of :
  • Chemical replacement reaction
  • Neutralisation reaction
  • Precipitation reaction
  • Chemical double decomposition reaction
The reaction, $$AB\rightarrow A + B$$ is a:
  • Decombination reaction
  • Combination reaction
  • Chemical composition
  • Decomposition reaction
What are the oxidation numbers of the atoms in the compound $$CF_4$$?
  • +4, -1
  • +1, -4
  • +3, -2
  • +2, -3
  • +4, -4
Heat is released in :
  • Exothermic reactions
  • Endothermic reactions
  • Both A and B
  • None of these
The oxidation state of nitrogen is most positive in which of the following compounds?
  • $${NO}_{3}^{-}$$
  • $${NO}_{2}^{-}$$
  • $${N}_{2}O$$
  • $${N}_{2}$$
  • $${NH}_{3}$$
The oxidation number of the nitrogen atom in the ammonium ion is :
  • +3
  • +2
  • +1
  • -2
  • -3
Alumino thermite process involves reduction of chromium with oxide and aluminium.
  • True
  • False
In which of the following does sulphur has the lowest oxidation state?
  • $$H_2SO_4$$
  • $$SO_2$$
  • $$H_3SO_3$$
  • $$H_2S$$
The range of oxidation states exhibited by most elements in group V of the periodic table (N.P. As Sb. Bi) is
  • -3 to +1
  • -3 to +3
  • -3 to +5
  • -2 to +3
  • +1 to +5
In which of the following reactions, the oxidation state of nitrogen is not changed?
  • Action of very dilute $$HN{ O }_{ 3 }$$ on magnesium
  • Action of $$conc.HN{ O }_{ 3 }$$ on zinc
  • Action of $$conc.HN{ O }_{ 3 }$$ on copper
  • Action of very dilute $$HN{ O }_{ 3 }$$ on zinc
Hydrogen sulphide gets reduced to sulphur.
  • True
  • False
The oxidation number for sulfur is highest in which of the following ions or compounds?
  • $$SO_2$$
  • $$SO_3^{2-}$$
  • $$SO_4^{2-}$$
  • $$S_2O_3^{2-}$$
  • $$HSO_3^-$$
What is the oxidation state of $$Mn$$ in $$KMnO_4$$?
  • -7
  • -3
  • 0
  • +3
  • +7
In the electrochemical cell shown above, which of the following half-reactions occurs at the anode?
524234.JPG
  • $$\displaystyle { Cu }^{ 2+ }+e\rightarrow { Cu }^{ - }$$
  • $$\displaystyle Zn\left( s \right) \rightarrow { Zn }^{ 2+ }+2e$$
  • $$\displaystyle { Zn }^{ 2+ }+2e\rightarrow Zn\left( s \right) $$
  • $$\displaystyle Cu\left( s \right) \rightarrow { Cu }^{ 2+ }+2e$$
  • $$\displaystyle { Cu }^{ 2+ }+2e\rightarrow Cu\left( s \right) $$
    $$\displaystyle $$
Oxidation number of Cl in $$CaOCl_2$$ is ____________.
  • $$-1$$ and $$+1$$
  • $$+2$$
  • $$-2$$
  • none of these
Which of these half-reactions represents an oxidation?
I. $$Sn^{4+} \rightarrow  Sn^{2+}$$
II. $$MnO_4^-\rightarrow Mn^{2+}$$
III. $$Cl_2\rightarrow ClO_3^-$$
  • I only
  • II only
  • III only
  • I and II only
  • II and III only
Which of these types of chemical reactions is NOT a redox reaction?
  • Decomposition into elements
  • Single replacement
  • Double replacement
  • Combustion
  • Synthesis of two eiements
Statement I : The oxidation state of Cr in $$Al_2(Cr_2O_7)_3$$ is +3.
Statement II : as a neutral compound, the sum of oxidation numbers of all the atoms must equal zero.
  • Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1
  • Both the Statement 1 and Statement 2 are correct and Statement 2 is NOT the correct explanation of Statement 1
  • Statement 1 is correct but Statement 2 is not correct
  • Statement 1 is not correct but Statement 2 is correct
  • Both the Statement 1 and Statement 2 are not correct.
What is the oxidation number of $$Mn$$ in $$Mn{O}_{2}$$?
  • $$+2$$
  • $$+4$$
  • $$-2$$
  • $$-4$$
What is the oxidation number of lead in $$Pb{F}_{2}$$?
  • $$0$$
  • $$+2$$
  • $$+1$$
  • $$-1$$
What is the oxidation state of bromine in $$Al{Br}_{3}$$?
  • $$-1$$
  • $$+3$$
  • $$0$$
  • $$-3$$
What is the oxidation number for As in the chemical formula for arsenic acid, $$H_3AsO_4$$?
  • +1
  • +2
  • +3
  • +4
  • +5
In which of the following compounds does bromine have the highest positive oxidation state?
  • $$\displaystyle HBr$$
  • $$\displaystyle Br{ F }_{ 3 }$$
  • $$\displaystyle Br{ O }_{ 2 }$$
  • $$\displaystyle NaBrO$$
  • $$\displaystyle NaBr{ O }_{ 3 }$$
In which substance does manganese have the highest oxidation number?
  • $$LiMnO_{4}$$
  • $$K_{2}MnO_{4}$$
  • $$MnO_{2}$$
  • $$Mn(NO_{3})_{2}$$
Which of the following are redox reactions?
I. $$PCl_{3} + Cl_{2}\rightarrow PCl_{5}$$
II. $$Cu + 2AgNO_{3} \rightarrow Cu(NO_{3})_{2} + 2Ag$$
III. $$CO_{2} + 2LiOH \rightarrow Li_{2}CO_{3} + H_{2}O$$
IV. $$FeCl_{2} + 2NaOH \rightarrow Fe(OH)_{2} + 2NaCl$$
  • II
  • I and II
  • I, II, and III
  • I, II, III and IV
The oxidation number of chromium in $$K_{2}CrO_{4}$$ is?
  • $$2+$$
  • $$3+$$
  • $$6+$$
  • $$8+$$
What is one of the spectator ions in the following reaction?
$$Pb(NO_{3})_{2} (aq) + 2KI(aq) \rightarrow PbI_{2} (s) + 2KNO_{3}(aq)$$
  • $$NO_{3}{^-}$$
  • $$I^{-}$$
  • $$PbI_{2}$$
  • $$Pb^{+2}$$
Which of the following reactions represents an oxidation-reduction reaction?
  • $$2NaCl_{(aq)} + K_{2}CO_{3(aq)} \rightarrow Na_{2}CO_{3(aq)} + 2KCl_{(aq)}$$
  • $$CaCO_{3(aq)} \xrightarrow {\Delta} CaO_{(s)} + CO_{2(g)}$$
  • $$2Mg_{(s} + O_{2(g)} \rightarrow 2MgO_{(s)}$$
  • $$3FeCl_{2(aq)} + 2Cu_{3}PO_{4(aq)} \rightarrow Fe_{3}(PO_{4})_{2(aq)} + 6CuCl_{(aq)}$$
Your group was asked to identify which types of reactions can be represented as redox reactions. Everyone has given an examples of what they think is correct.
Check their answer and decide who is right.
  • Crystal Lynn says synthesis reactions can be classified as redox: $$Na_{(s)} + Cl_{2(g)} \rightarrow 2NaCl_{(s)}$$
  • Barry Um says decomposition reactions can be classified as redox: $$H_{2}O_{(l)}\rightarrow H_{2(g)} + O_{2(g)}$$
  • Barry's brother, Cal C. Um states that single replacement reactions can be classified as redox: $$Ag_{(s)} + NaCl_{(aq)} \rightarrow Na_{(s)} + AgCl_{(aq)}$$
  • Molly Cule state everyone in the group is correct. Redox reactions can be classified as each of the examples cited.
Select the non-redox reaction with the correct justification.
  • $$2Na + Cl_{2}\rightarrow 2NaCl$$; electrons are not transferred.
  • $$Fe + Cu^{2+} \rightarrow Fe^{2+} + Cu$$; electron are transferred.
  • $$Ag^{+} + Cl^{-}\rightarrow AgCl$$; electron are not transferred.
  • $$CH_{4} + 2O_{2} \rightarrow CO_{2} + 2H_{2}O$$; electron are transferred.
$$I$$. The oxidation state of carbon in the compounds $${CH}_{4},{C}_{2}{H}_{6}$$ and $${C}_{2}{H}_{2}$$ is $$+4$$.
$$II$$. Carbon has four valence electrons.
  • Statement $$I$$ is true, Statement $$II$$ is true
  • Statement $$I$$ is true, Statement $$II$$ is false
  • Statement $$I$$ is false, Statement $$II$$ is true
  • Statement $$I$$ is false, Statement $$II$$ is false
What is the oxidation number of $$Br$$ in the compound $$RbBr{O}_{4}$$?
  • $$-1$$
  • $$+7$$
  • $$+1$$
  • $$+4$$
Balanced chemical equation imply which of the following?
  • Numbers of atoms are conserved in a chemical change
  • Numbers of molecules are conserved in a chemical change
  • Volume is conserved in a chemical change
  • 'A' and 'B'
  • 'B' and 'C'
In which of the following compounds does nitrogen have the highest oxidation number?
  • Nitrogen Gas
  • Aluminum Nitride
  • Potassium Nitrate
  • Nitrous Acid
Which expression gives the correct value for the standard potential for a gold-rhodium voltaic cell?
Half-reaction$$E^{\circ}(V)$$
$$Rh_{(aq)}^{+3} + 3e^{-} \rightarrow Rh_{(s)}$$$$0.76\ V$$
$$Au_{(aq)}^{+} + e^{-} \rightarrow Au_{(s)}$$$$1.69\ V$$
  • $$1.69\ V + 0.76\ V$$
  • $$1.69\ V - 0.76\ V$$
  • $$3(1.69)\ V + 0.76\ V$$
  • $$3(1.69)\ V - 0.76\ V$$
Find the oxidation number of $$N$$ & $$Cl$$ in $$NOCl_4$$ respectively is:
  • $$+3, +6$$
  • $$+2, +6$$
  • $$+3, +7$$
  • $$+2, +7$$
Which of the following represents the oxidation half-reaction for the unbalanced redox equation?
$$Cu + HNO_{3} \rightarrow Cu (NO_{3})_{2} + NO_{2}$$
  • $$Cu^{2+} + 2e^{-} \rightarrow Cu$$
  • $$Cu \rightarrow Cu^{2+} + 2e^{-}$$
  • $$NO_{3}^{-} \rightarrow NO_{2} + 1e^{-}$$
  • $$2H^{+} + NO_{2}^{-} + 1e^{-} \rightarrow NO_{2} + H_{2}O$$
The given figure represents a $$Zn-Cu$$ electrochemical cell:
Based on the figure, which of the following represents the balanced chemical reaction?
536568_46590ac83f344c2cbad8f3d7ef921d6f.png
  • $$Zn_{(aq)}^{2+} + Cu_{(s)} \rightarrow Zn_{(s)} + Cu_{(aq)}^{2+}$$
  • $$Zn_{(s)} + Cu_{(aq)}^{2+} \rightarrow Zn_{(aq)}^{2+} + Cu_{(s)}$$
  • $$Zn_{(s)} + Cu_{(s)} \rightarrow Zn_{(aq)}^{2+} + Cu_{(aq)}^{2+}$$
  • $$Zn_{(aq)}^{2+} + Cu_{(aq)}^{2+} \rightarrow Zn_{(s)} + Cu_{(s)}$$
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 11 Medical Chemistry Quiz Questions and Answers