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question_answer1)
Which one of the following reactions does not involve either oxidation or reduction?
A)
\[V{{O}^{+}}_{2}\to {{V}_{2}}{{O}_{3}}\] done
clear
B)
\[Na\to N{{a}^{+}}\] done
clear
C)
\[Cr{{O}^{2-}}_{4}\]\[\to C{{r}_{2}}{{O}_{7}}^{2-}\] done
clear
D)
\[Z{{n}^{2+}}\to Zn\] done
clear
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question_answer2)
In the following reaction, \[3B{{r}_{2}}+6C{{O}^{2-}}_{3}+3{{H}_{2}}O=5B{{r}^{-}}+Br{{O}_{3}}^{-}+6HC{{O}_{3}}\]
A)
Bromine is oxidised and carbonate is reduced done
clear
B)
Bromine is reduced and water is oxidized done
clear
C)
Bromine is neither reduced nor oxidized done
clear
D)
Bromine is both reduced and oxidised done
clear
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question_answer3)
In which of the following reactions \[{{H}_{2}}{{O}_{2}}\] is a reducing agent?
A)
\[2FeC{{l}_{2}}+2HCl+{{H}_{2}}{{O}_{2}}\to 2FeC{{l}_{3}}+2{{H}_{2}}O\] done
clear
B)
\[C{{l}_{2}}+{{H}_{2}}{{O}_{2}}\to 2HCl+{{O}_{2}}\] done
clear
C)
\[2HI+{{H}_{2}}{{O}_{2}}\to 2{{H}_{2}}O+{{I}_{2}}\] done
clear
D)
\[{{H}_{2}}S{{O}_{3}}+{{H}_{2}}{{O}_{2}}\to {{H}_{2}}S{{O}_{4}}+{{H}_{2}}O\] done
clear
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question_answer4)
When \[KMn{{O}_{4}}\] acts as an oxidising agent and ultimately forms \[{{[Mn{{O}_{4}}]}^{-2}},Mn{{O}_{2}},M{{n}_{2}}{{O}_{3}},M{{n}^{+2}}\], then the number of electrons transferred in each case respectively is
A)
4, 3, 1, 5 done
clear
B)
1, 5, 3, 7 done
clear
C)
1, 3, 4, 5 done
clear
D)
3, 5, 7, 1 done
clear
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question_answer5)
In the redox reaction \[xMnO+yPb{{O}_{2}}+\]\[zHN{{O}_{3}}\to HMn{{O}_{4}}+Pb{{(N{{O}_{3}})}_{2}}+{{H}_{2}}O\]
A)
\[x=2,\text{ }y=5,\text{ }z=10\] done
clear
B)
\[x=2,\text{ }y=7,\text{ }z=8\]b done
clear
C)
\[x=2,\text{ }y=5,\text{ }z=8\] done
clear
D)
\[x=2,\text{ }y=5,\text{ }z=5\] done
clear
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question_answer6)
For the redox reaction \[Mn{{O}^{-}}_{4}\]\[+\]\[{{C}_{2}}{{O}_{4}}^{2-}\]\[+\]\[{{H}^{+}}\]\[\to M{{N}^{2+}}\]\[+C{{O}_{2}}\]\[+{{H}_{2}}O\]the correct coefficients of the reactants for the balanced reaction are
A)
B)
C)
D)
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question_answer7)
In the following reaction, \[2{{I}^{-}}+C{{r}_{2}}{{O}^{2-}}_{7}+14{{H}^{+}}\to {{I}_{2}}+2C{{l}^{3+}}+7{{H}_{2}}O\] Unbalanced parts are
A)
\[{{H}^{+}},\,{{H}_{2}}O\] done
clear
B)
\[C{{r}_{2}}{{O}^{2-}}_{7},C{{r}^{3+}}\] done
clear
C)
\[{{I}^{-}},{{I}_{2}}\] done
clear
D)
None of them are balanced done
clear
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question_answer8)
CuS is dissolved in dil. \[HN{{O}_{3}}\]. Balanced equation with correct products is
A)
\[CuS=2{{H}^{+}}=3N{{O}^{-}}_{3}\to Cu(N{{O}_{3}}+{{H}_{2}}S)\]\[+{{H}_{2}}O+N{{O}_{2}}\] done
clear
B)
\[3CuS=8{{H}^{+}}=8N{{O}^{-}}_{3}\to 3Cu{{(N{{O}_{3}})}_{2}}+3S\]\[+4{{H}_{2}}O+2N{{O}_{}}\] done
clear
C)
\[CuS+4N{{O}^{-}}_{3}\to Cu{{(N{{O}_{3}})}_{2}}+{{H}_{2}}S+{{H}_{2}}O\] done
clear
D)
None of the above incorrect done
clear
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question_answer9)
25 mL of 0.50 M \[{{H}_{2}}{{O}_{2}}\], solution is added to 50 mL of 0.20 M \[KMn{{O}_{4}}\] in acid solution. Which of the following statements is true?
A)
0.010 mole of oxygen is liberated done
clear
B)
0.005 mole of \[KMn{{O}_{4}}\]are left done
clear
C)
0.030 g atom of oxygen is evolved. done
clear
D)
0.0025 mole \[{{H}_{2}}{{O}_{2}}\]does not react with \[KMn{{O}_{4}}\] done
clear
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question_answer10)
An element A in a compound ABD has oxidation number \[{{A}^{{{n}^{-}}}}\]. It is oxidised by \[C{{r}_{2}}O_{7}^{2-}\] in acid medium. In the experiment \[1.68\times {{10}^{-3}}\]moles of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]was used for \[3.26\times {{10}^{-3}}\]moles of ABD. The new oxidation number of A after oxidation is:
A)
3 done
clear
B)
3-n done
clear
C)
n-3 done
clear
D)
+n done
clear
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question_answer11)
Which of the following has been arranged in order of increasing oxidation number of nitrogen?
A)
\[N{{H}_{3}}<{{N}_{2}}{{O}_{5}}<NO<{{N}_{2}}\] done
clear
B)
\[N{{O}^{+}}_{2}<N{{O}^{-}}_{3}<N{{O}^{-}}_{2}<{{N}^{-}}_{3}\] done
clear
C)
\[N{{H}^{+}}_{4}<{{N}_{2}}{{H}_{4}}<N{{H}_{2}}OH<{{N}_{2}}O\] done
clear
D)
\[N{{O}_{3}}<Na{{N}_{3}}<N{{H}^{+}}_{4}<{{N}_{2}}O\] done
clear
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question_answer12)
In the following conversion of chromite into soluble chromium salt \[4Fe(Cr{{O}_{2}})2+8N{{a}_{2}}C{{O}_{3}}+7{{O}_{2}}\to 2F{{e}_{2}}{{O}_{3}}+8NaCr{{O}_{4}}+8C{{O}_{2}}\]There is
A)
Oxidation of Fc and Cr both and reduction of \[{{O}_{2}}\] done
clear
B)
oxidation of Fe and reduction of Cr done
clear
C)
oxidation of Fe and Cr both reduction of barbon done
clear
D)
No redox reaction done
clear
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question_answer13)
n the following equation : \[Cl{{O}^{-}}_{3}+6{{H}^{+}}+X\to C{{I}^{-}}+3{{H}_{2}}O,\]
A)
\[O\] done
clear
B)
\[6{{e}^{-}}\] done
clear
C)
\[{{O}_{2}}\] done
clear
D)
\[5{{e}^{-}}\] done
clear
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question_answer14)
If 10 g of \[{{V}_{2}}{{O}_{5}}\], is dissolved in acid and is reduced to \[{{V}^{2+}}\] by zinc metal, how many mole of I, could be reduced by the resulting solution if it is further oxidised to \[V{{O}^{2+}}\]ions? [Assume no change in state of \[Z{{n}^{2+}}\]ions] (V=51,O=16, I=127):
A)
0.11 mole of \[{{I}_{2}}\] done
clear
B)
0.22 mole of \[{{I}_{2}}\] done
clear
C)
0.055 mole of \[{{I}_{2}}\] done
clear
D)
0.44 mole of \[{{I}_{2}}\] done
clear
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question_answer15)
In the following unbalanced redox reaction, \[C{{u}_{3}}P+C{{r}_{2}}{{O}_{7}}^{2-}\to C{{u}^{2+}}+{{H}_{3}}P{{O}_{4}}+C{{r}^{3+}}\] Equivalent weight of \[{{H}_{3}}P{{O}_{4}}\] is
A)
\[\frac{M}{3}\] done
clear
B)
\[\frac{M}{6}\] done
clear
C)
\[\frac{M}{7}\] done
clear
D)
\[\frac{M}{8}\] done
clear
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question_answer16)
5 liters of \[KMn{{O}_{4}}\] solution contains 0.01 equiv of\[KMn{{O}_{4}}\]. 50 ml of the given solution contains how many moles of\[KMn{{O}_{4}}\]?\[KMn{{O}_{4}}\to Mn{{O}_{2}}\]
A)
\[\frac{{{10}^{-6}}}{4}\] done
clear
B)
\[\frac{{{10}^{-4}}}{3}\] done
clear
C)
\[3\times {{10}^{-5}}\] done
clear
D)
\[{{10}^{-5}}\] done
clear
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question_answer17)
The oxidation number of \[Cl\]in\[CaOC{{l}_{2}}\], (bleaching powder) is
A)
Zero, since it contains \[C{{l}_{2}}\] done
clear
B)
-1, since it contains \[C{{l}^{-}}\] done
clear
C)
+1, since it contains \[Cl{{O}^{-}}\] done
clear
D)
+1 and -1, since it contains \[Cl{{O}^{-}}\] and \[C{{l}^{-}}\] done
clear
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question_answer18)
Amount of oxalic acid present in a solution can be determined by its titration with \[KMn{{O}_{4}}\]solution in the presence of\[{{H}_{2}}S{{O}_{4}}\]. The titration gives unsatisfactory result when carried out in the presence of HCI. Because HCI:
A)
gets oxidized by oxalic acid to chlorine done
clear
B)
Furnishes \[{{H}^{+}}\] ions in addition to those from oxalic acid done
clear
C)
Reduces permanganate to \[M{{n}^{2+}}\] done
clear
D)
oxidizes oxalic acid to carbon dioxide and water done
clear
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question_answer19)
In the compound \[YB{{a}_{2}}C{{u}_{3}}{{O}_{7}}\] which shows superconductivity, what is the oxidation state of cu? Assume the rare earth element yttrium is in its usual +3 oxidation state.
A)
\[+\frac{7}{3}\] done
clear
B)
\[-\frac{7}{3}\] done
clear
C)
\[+\frac{5}{3}\] done
clear
D)
\[-\frac{5}{3}\] done
clear
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question_answer20)
Oxida n states of the metal in the minerals Haematite and magnetite, respectively, are
A)
II, III, in heamatite and III in magnetite done
clear
B)
II, III in haematite and II in magnetite done
clear
C)
II in haematite and II, III in magnetite done
clear
D)
III is haematite and II, III in magnetite done
clear
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question_answer21)
The oxidation number of phosphorus in \[Ba{{({{H}_{2}}P{{O}_{2}})}_{2}}\]is
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question_answer22)
50 mL of 0.1 M solution of a salt reacted with 25 mL of 0.1 M solution of sodium sulphite. The half reaction for the oxidation of sulphite ion is: \[S{{O}^{2-}}_{3}(aq)+{{H}_{2}}O(l)\to S{{O}^{2-}}_{4}(aq)=2{{H}^{+}}(aq)+2{{e}^{-}}\]if the oxidation number of metal in the slat was 3, what would be the new oxidation number of metal?
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question_answer23)
Prussian blue has two types of iron with oxidation number as shown: \[\overset{III}{\mathop{Fe}}\,[\overset{II}{\mathop{Fe}}\,{{(CN)}_{6}}].\] .The net charge on Prussian blue is
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question_answer24)
\[HN{{O}_{3}}\] oxidises \[N{{H}^{+}}_{4}\] ions to nitrogen and itself gets reduced to \[N{{O}_{2}}\]. The moles of \[HN{{O}_{3}}\] required by 1 mol of \[{{(N{{H}_{4}})}_{2}}S{{O}_{4}}\]is
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question_answer25)
In the reaction, \[Cr{{O}_{5}}+{{H}_{2}}S{{O}_{4}}\to C{{r}_{2}}{{(S{{O}_{4}})}_{3}}+{{H}_{2}}O+{{O}_{2}}\]one mole of \[Cr{{O}_{5}}\] will liberate how many moles of \[{{O}_{2}}\]
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