CBSE Questions for Class 11 Medical Chemistry Redox Reactions Quiz 6 - MCQExams.com

Analyze the diagram. The left beaker represents the start of the reaction and the right beaker represents the end of the reaction.
Classify this reaction.
536653_80e81cb1a8444e07ba2c91e2b445fa44.png
  • Acid-Base Neutralization reaction.
  • Redox reaction.
  • Precipitation reaction.
  • More information is needed.
The oxidation number of chromium in $$K_{2}CrO_{4}$$ is:
  • $$+2$$
  • $$+3$$
  • $$+6$$
  • $$+8$$
$$KMnO_4$$ and $$K_2Cr_2O_7$$ are _____agents and $$Na_2S_2O_7$$ is ______ agent.
  • reducing , oxydising
  • oxydising , reducing
  • reducing , reducing
  • oxydising , oxydising
$$2Pb{ O }_{ \left( s \right)  }+{ C }_{ \left( s \right)  }\rightarrow 2{ Pb }_{ \left( s \right)  }+C{ O }_{ 2\left( g \right)  }$$
Which of the following statements are correct for the above chemical reaction?
a) Lead is reduced
b) Carbon dioxide is oxidized
c) Carbon is oxidized
d) Lead oxide is reduced
  • (a) and (b)
  • (a) and (c)
  • (a), (b) and (c)
  • All

A sample of oleum is labelled 109%. The % of free $$SO_3$$ in the sample is :
  • 40%
  • 80%
  • 60%
  • 9%
Which of the following compounds we use in our laboratory as a standard solution (titrant) ?
  • $$KMnO_4$$
  • $$K_2Cr_2O_7$$
  • $$Na_2S_2O_3$$
  • All of these
If the 1.58g of $$KMnO_4$$ in acidic medium completely reacts with ferrous oxalate what weight (in gm) of ferrous oxalate is required?
  • 2.73 gm
  • 4.73 gm
  • 11.19 gm
  • 5.62 gm
$$H_3PO_4$$ is a tribasic acid and one of its salts is $$NaH_2PO_4$$. What volume of 1 M $$NaOH$$ solution should be added to 12 g of $$NaH_2PO_4$$ to convert it into $$Na_3PO_4$$?
  • 100 ml
  • 200 ml
  • 300 ml
  • 50 ml
Since, the titration is completely based on volume measurement, it is a volumetric analysis.
  • True
  • False
In a redox titration, the compound of known concentration is called as analyte or titrand while the standard solution is called as titrant or titrator
  • True
  • False
What is the change in the oxidation state of Mn, in the reaction of $$MnO_4^-$$ with $$H_2O_2$$ in acidic medium?
  • $$7\rightarrow 4$$
  • $$6 \rightarrow 4$$
  • $$7 \rightarrow 2$$
  • $$6 \rightarrow 2$$
Which titrant is used in the Iodometric titration which involves $$I_2$$ ?
  • $$KMnO_4$$
  • $$K_2Cr_2O_7$$
  • $$Na_2S_2O_3$$
  • All of them
What is the oxidation state of central atom in $$[Co(NH_3)_4(OH_2)I]SO_4$$?
  • $$1$$
  • $$2$$
  • $$3$$
  • $$4$$
The oxidation state of the underlined element in the given compound is:
$$Na_2\underline{Mo}O_4$$
  • +4
  • +5
  • +6
  • none of these
What is the oxidation state of central atom in $$K[Cr(NH_3)_2Cl_4]$$?
  • $$1$$
  • $$2$$
  • $$3$$
  • $$4$$
What is the oxidation state of $$Mn$$ in $$[Mn(CN)_5]^{2-}$$?
  • $$1$$
  • $$2$$
  • $$3$$
  • $$4$$
What is the oxidation state of central atom in $$Ca[PtCl_4]$$?
  • $$1$$
  • $$2$$
  • $$3$$
  • $$4$$
In alkaline medium, the reaction of hydrogen peroxide with potassium permanganate produces a compound in which the oxidation state of $$Mn$$ is:
  • $$0$$
  • $$+2$$
  • $$+3$$
  • $$+4$$
Oxygen gas reacts with hydrogen to produce water. The reaction is represented by the equation:
$${ O }_{ 2 }\left( g \right) +{ H }_{ 2 }\left( g \right) \longrightarrow { H }_{ 2 }O\left( g \right) $$
The above reaction is an example of
a) Oxidation of hydrogen
b) Reduction of oxygen
c) Reduction of hydrogen
d) Redox reaction
  • (a), (b) and (c)
  • (b), (c) and (d)
  • (a), (c) and (d)
  • (a), (b) and (d)
Oxidation number of nitrogen in which among the oxides of nitrogen is the lowest?
  • Nitric oxide
  • Nitrous oxide
  • Nitrogen dioxide
  • Dinitrogen trioxide
The oxidation number of iron in $${Fe}_{3}{O}_{4}$$ is:
  • $$+2$$
  • $$+3$$
  • $$\cfrac{8}{3}$$
  • $$\cfrac{2}{3}$$
What is the number of coulombs required for the conversion of one mole of $$MnO_{4}^{-}$$ to one mole of $$Mn^{2+}$$?
  • $$5\times 96500$$
  • $$3\times 96500$$
  • $$96500$$
  • $$9650$$
The half-cell reaction is the one that:
  • takes place at one electrode
  • consumes half a unit of electricity
  • involves half a mole of electrolyte
  • goes half way to completion
Oxidation state of $$S$$ in $${SO_4}^{2-}$$ is:
  • $$+6$$
  • $$+3$$
  • $$+2$$
  • $$-2$$
The oxidation number of chromium in $$\displaystyle Cr{ O }_{ 5 }$$ is:
  • +6
  • +5
  • +10
  • 0
Standard electrode potential data are useful for understanding the suitability of an oxidant in a redox titration. Some half-cell reactions and their standard potentials are given below:
$$Mn{O}_{4}^{-} (aq.) + 8H^{+}(aq.) + 5e^{-} \rightarrow Mn^{2+}(aq.) + 4H_{2}O(l); E^{\circ} = 1.51\ volt$$
$$Cr_{2}O_{7}^{2-}(aq.) + 14H^{+}(aq.) + 6e^{-} \rightarrow 2Cr^{3+}(aq.) + 7H_{2}O(l)' E^{\circ} = 1.38\ volt$$
$$Fe^{3+}(aq.) + e^{-}\rightarrow Fe^{2+}(aq.); E^{\circ} = 0.77\ volt$$
$$Cl_{2}(g) + 2e^{-} \rightarrow 2Cl^{-}(aq.); E^{\circ} = 1.40\ volt$$
Identity the only incorrect statement regarding the quantitative estimation of aqueous $$Fe(NO_{3})_{2}$$.
  • $$Mn{O}_{4}^{-}$$ can be used in aqueous $$HCl$$
  • $$Cr_{2}O_{7}^{2-}$$ can be used in aqueous $$HCl$$
  • $$Mn{O}_{4}^{-}$$ can be used in aqueous $$H_{2}SO_{4}$$
  • $$Cr_{2}O_{7}^{2-}$$ can be used in aqueous $$H_{2}SO_{4}$$
In $$Ni(CO)_4$$, the oxidation state of Ni is?
  • $$4$$
  • Zero
  • $$2$$
  • $$8$$
In which of the following compounds, iron has an oxidation state of $$+3$$?
  • $$Fe(NO_3)_2$$
  • $$FeC_2O_4$$
  • $$[Fe(H_2O)_6]Cl_3$$
  • $$(NH_4)_2SO_4\cdot FeSO_4\cdot 6H_2O$$
$$One\ mole$$ of $$N_2H_4$$ loses $$10\ moles$$ of electrons to form a new compound $$Y$$. Assuming that all nitrogen appear in the new compound, what is the oxidation state of nitrogen in compound $$Y$$?
[There is no change in the oxidation state of hydrogen.]
  • $$-1$$
  • $$-3$$
  • $$+3$$
  • $$+5$$
When $$SO_2$$ is passed through an acidified solution of $$K_2Cr_2O_7$$, then chromium sulphate is formed. Change in oxidation state of Cr is from.
  • $$+4$$ to $$+2$$
  • $$+6$$ to $$+3$$
  • $$+7$$ to $$+2$$
  • $$+5$$ to $$+3$$
Arrange the following in the increasing order of oxidation state of $$Mn.$$
(i) $$Mn^{2+}$$
(ii) $$MnO_2$$
(iii) $$KMnO_4$$
(iv) $$K_2MnO_4$$.
  • (i) $$>$$ (ii) $$>$$ (iii) $$>$$ (iv)
  • (i) $$<$$ (ii) $$<$$ (iv) $$<$$ (iii)
  • (ii) $$<$$ (iii) $$<$$ (i) $$<$$ (iv)
  • (iii) $$<$$ (i) $$<$$ (iv) $$<$$ (ii)
When $$KMnO_4$$ is reduced with oxalic acid in acidic solution, the oxidation number of Mn changes from.
  • $$7$$ to $$2$$
  • $$7$$ to $$4$$
  • $$7$$ to $$6$$
  • $$6$$ to $$2$$
When P reacts with caustic soda, the products are $$PH_3$$ and $$NaH_2PO_2$$. The reaction is an example of.
  • Oxidation
  • Reduction
  • Both oxidation and reduction
  • Neutralisation
Oxidation number of fluorine in $$F_2O$$ is:
  • $$+1$$
  • $$+2$$
  • $$-1$$
  • $$-2$$
Oxidation number of Fe in $$Fe_{0.94}O$$ is?
  • $$200$$
  • $$200/94$$
  • $$94/200$$
  • None of these
In the compounds $$KMnO_4$$ and $$K_2Cr_2O_7$$, the highest oxidation state is of the element.
  • Potassium
  • Chromium
  • Oxygen
  • Manganese
The oxidation numbers of C in $$CH_4, CH_3Cl, CH_2Cl_2, CHCl_3$$ and $$CCl_4$$ are respectively.
  • $$+4, +2, 0, -2, -4$$
  • $$+2, +4, 0, -4, -2$$
  • $$-4, -2, 0, +2, +4$$
  • $$-2, -4, 0, +4, +2$$
The oxidation state of the most electronegative element in the products of the reaction between $$BaO_2$$ and $$H_2SO_4$$ are:
  • $$0$$ and $$-1$$
  • $$-1$$ and $$-2$$
  • $$-2$$ and $$0$$
  • $$-2$$ and $$+1$$
It is found that V forms a double salt isomorphous with Mohr's salt. The oxidation number of V in this compound is_________.
  • $$+3$$
  • $$+2$$
  • $$+4$$
  • $$-4$$
Oxygen has an oxidation state of $$+2$$ in.
  • $$H_2O_2$$
  • $$OF_2$$
  • $$SO_2$$
  • $$H_2O$$
Bromine reacts with the hot aqueous alkali to give bromide and bromate. What is the change that is brought about in the oxidation state of bromine to bromate?
  • $$-1$$ to $$+5$$
  • $$0$$ to $$+5$$
  • $$0$$ to $$+7$$
  • None of these
Oxidation number of C in HNC is_________.
  • $$+2$$
  • $$-3$$
  • $$+3$$
  • Zero
Oxidation number of iodine in $$IO^-_3, IO^-_4, KI$$ and $$I_2$$ respectively are____________.
  • $$-1, -1, 0, +1$$
  • $$+3, +5, +7, 0$$
  • $$+5, +7, -1, 0$$
  • $$-1, -5, -1, 0$$
  • $$-2, -5, -1, 0$$
Nitrogen forms a variety of compounds in all oxidation states ranging from.
  • $$-3$$ to $$+5$$
  • $$-3$$ to $$+3$$
  • $$-3$$ to $$+4$$
  • $$-3$$ to $$+6$$
The oxidation number of sulphur in $$S_8, S_2F_2$$ and $$H_2S$$ respectively are__________.
  • $$0, +1$$ and $$-2$$
  • $$+2, +1$$ and $$-2$$
  • $$0, +1$$ and $$+2$$
  • $$-2, +1$$ and $$-2$$
On reduction of $$KMnO_4$$ by oxalic acid in acidic medium, the oxidation number of Mn chnages. What is the magnitude of this change?
  • $$7$$ to $$2$$
  • $$6$$ to $$2$$
  • $$5$$ to $$2$$
  • $$7$$ to $$4$$
Which of the following shows nitrogen with its increasing order of oxidation number?
  • $$NO < N_2O < NO_2 < NO^-_3, NH^+_4$$
  • $$NH^+_4 < N_2O < NO_2 < NO^-_3 < NO$$
  • $$NH^+_4 < N_2O < NO < NO_2 < NO^-_3$$
  • $$NH^+_4 < NO < N_2O < NO_2 < NO^-_3$$
The oxidation numbers of the sulphur atoms in peroxy monosulphuric acid $$(H_2SO_5)$$ and peroxydisulphuric and $$(H_2S_2O_8)$$ are respectively.
  • $$+8$$ and $$+7$$
  • $$+3$$ and $$+3$$
  • $$+6$$ and $$+6$$
  • $$+4$$ and $$+6$$
$$CrO_5$$ has structure as shown, The oxidation number of chromium in the compound is?
664802_f4c754be60e347a3b0409bd581edd070.png
  • $$+4$$
  • $$+5$$
  • $$+6$$
  • $$+10$$
  • $$0$$
The oxidation state of the underlined element in the given compound is:
$$\underline{C_{12}}H_{22}O_{11}$$
  • +5
  • +4
  • 0
  • none of these
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