When the following redox reaction is balanced, coefficient of \[{{H}^{+}}\] would be: \[M{{n}^{2+}}+BiO_{3}^{-}+{{H}^{+}}\to B{{i}^{3+}}+MnO_{4}^{-}+{{H}_{2}}O\]
A)
3
done
clear
B)
4
done
clear
C)
7
done
clear
D)
14
done
clear
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Consider the redox reaction : \[2S{{O}_{2}}O_{3}^{2-}+{{I}_{2}}\to {{S}_{4}}O_{6}^{2-}+2{{I}^{-}}\]
A)
\[2S{{O}_{2}}O_{3}^{2-}\] gets oxidised to \[S{{O}_{4}}O_{6}^{2-}\]
done
clear
B)
\[S{{O}_{2}}O_{3}^{2-}\] gets reduced to \[{{S}_{4}}O_{6}^{2-}\]
done
clear
C)
\[{{I}_{2}}\] gets reduced to \[{{I}^{-}}\]
done
clear
D)
\[{{I}_{2}}\] gets oxidised to \[{{I}^{-}}\]
done
clear
View Answer play_arrow
Which of the following are redox reactions?
A)
\[\frac{1}{2}{{H}_{2}}+\frac{1}{2}{{I}_{2}}+HI\]
done
clear
B)
\[PC{{l}_{5}}\to PC{{l}_{3}}+C{{l}_{2}}\]
done
clear
C)
\[2CuS{{O}_{4}}+4KI\to C{{u}_{2}}{{I}_{2}}+2{{K}_{2}}S{{O}_{4}}+{{I}_{2}}\]
done
clear
D)
\[CaOC{{l}_{2}}\to C{{a}^{+2}}+OC{{l}^{-}}+C{{l}^{-}}\]
done
clear
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The largest oxidation number exhibited by an element depends on its outer electronic configuration. With which of the following outer electronic configurations the element will exhibit largest oxidation number?
A)
\[3{{d}^{1}}4{{s}^{2}}\]
done
clear
B)
\[3{{d}^{3}}4{{s}^{2}}\]
done
clear
C)
\[3{{d}^{3}}4{{s}^{1}}\]
done
clear
D)
\[3{{d}^{5}}4{{s}^{2}}\]
done
clear
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While \[F{{e}^{3+}}\] is stable, \[M{{n}^{3+}}\] is not stable in acid solution because
A)
\[{{O}_{2}}\] oxidizes \[M{{n}^{2+}}\] to \[M{{n}^{3+}}\]
done
clear
B)
\[{{O}_{2}}\] oxidizes both \[M{{n}^{2+}}\] to \[M{{n}^{3+}}\] and \[F{{e}^{2+}}\] to \[F{{e}^{3+}}\]
done
clear
C)
\[F{{e}^{3+}}\] oxidizes \[{{H}_{2}}O\] to \[{{O}_{2}}\]
done
clear
D)
\[M{{n}^{3+}}\] oxidises \[{{H}_{2}}O\] to \[{{O}_{2}}\]
done
clear
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Oxidation number of cobalt in \[[Co{{(N{{H}_{3}})}_{6}}]C{{l}_{2}}Br\] is -
A)
+ 6
done
clear
B)
zero
done
clear
C)
+ 3
done
clear
D)
+ 2
done
clear
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The order of increasing O.N. of S in \[{{S}_{8}},\,{{S}_{2}},\,O_{8}^{-2},\,{{S}_{2}}_{3}^{-2}\] is:
A)
\[{{S}_{8}}<{{S}_{2}}O_{8}^{-2}<{{S}_{2}}O_{3}^{-2}<{{S}_{4}}O_{6}^{-2}\]
done
clear
B)
\[{{S}_{2}}O_{8}^{-2}<{{S}_{2}}O_{3}^{-2}<{{S}_{4}}O_{6}^{-2}<{{S}_{8}}\]
done
clear
C)
\[{{S}_{2}}O_{8}^{-2}<{{S}_{8}}<{{S}_{4}}O_{6}^{-2}<{{S}_{2}}O_{3}^{-2}\]
done
clear
D)
\[{{S}_{8}}<{{S}_{2}}O_{3}^{-2}<{{S}_{4}}O_{6}^{-2}<{{S}_{2}}O_{8}^{-2}\]
done
clear
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What will be the oxidation number of I in the \[K{{I}_{3}}\]?
A)
\[-\frac{1}{3}\]
done
clear
B)
\[-\frac{1}{4}\]
done
clear
C)
+ 4
done
clear
D)
+ 3
done
clear
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Oxidation number of Fe in \[{{[Fe{{(CN)}_{6}}]}^{-3}},\]\[{{[Fe{{(CN)}_{6}}]}^{-4}},\,{{[Fe(SCN)]}^{+2}}\] and \[{{[Fe{{({{H}_{2}}O)}_{6}}]}^{+3}}\] respectively would be-
A)
+3, +2, +3 and +3
done
clear
B)
+3, +3, +3 and +3
done
clear
C)
+3, +2, +2 and +2
done
clear
D)
+2, +2, +2 and +2
done
clear
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In which of the following pairs, there is greatest difference in the oxidation number of the underlined elements?
A)
\[\underline{N}{{O}_{2}}\] and \[{{\underline{N}}_{2}}{{O}_{4}}\]
done
clear
B)
\[{{\underline{P}}_{2}}{{O}_{5}}\] and \[{{\underline{P}}_{4}}{{O}_{10}}\]
done
clear
C)
\[{{\underline{N}}_{2}}O\] and \[\underline{N}O\]
done
clear
D)
\[\underline{S}\,{{O}_{2}}\] and \[\underline{S}\,{{O}_{3}}\]
done
clear
View Answer play_arrow
16 gm of metal carbonate converts into 18.8 gm of metal oxalate. The equivalent mass of metal chloride is
A)
50
done
clear
B)
85.5
done
clear
C)
100
done
clear
D)
135.5
done
clear
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The pair of compounds in which both the metals are in the highest possible oxidation state is
A)
\[{{[Fe{{(CN)}_{6}}]}^{3-}},\,{{[Co{{(CN)}_{6}}]}^{3-}}\]
done
clear
B)
\[Cr{{O}_{2}}C{{l}_{2}},\,MnO_{4}^{-}\]
done
clear
C)
\[Ti{{O}_{3}},\,Mn{{O}_{2}}\]
done
clear
D)
\[{{[Co{{(CN)}_{6}}]}^{3-}},\,Mn{{O}_{3}}\]
done
clear
View Answer play_arrow
Match List I with List II and select the correct answer using the code given below the lists:
List I
List II
Oxidising agent
(p) Disproportionation
\[M{{n}_{3}}{{O}_{4}}\]
(q) Redox reaction
\[{{C}_{6}}{{H}_{6}}\]
(r) Decreases oxidation number
\[2C{{u}^{+}}\xrightarrow{{}}C{{u}^{2+}}\]\[+C{{u}^{0}}\]
(s) Fractional oxidation number
(E) \[{{H}_{2}}{{O}_{2}}+{{O}_{3}}\xrightarrow{{}}\]\[{{H}_{2}}O+2{{O}_{2}}\]
(t) Oxidation number is -1
Codes:
A)
A\[\to \]q, B\[\to \]p, C\[\to \]t, D\[\to \]s, E\[\to \]r
done
clear
B)
A\[\to \]t, B\[\to \]s, C\[\to \]r, D\[\to \]q, E\[\to \]P
done
clear
C)
A\[\to \]r, B\[\to \]t, C\[\to \]s, D\[\to \]p, E\[\to \]q
done
clear
D)
A\[\to \]r, B\[\to \]s, C\[\to \]t, D\[\to \]p, E\[\to \]q
done
clear
View Answer play_arrow
Which of the following is not a disproportionate reaction?
A)
\[4KCl{{O}_{3}}\xrightarrow[{}]{{}}3KCl{{O}_{4}}+KCl\]
done
clear
B)
\[2C{{u}^{+}}\xrightarrow[{}]{{}}C{{u}^{2+}}+Cu\]
done
clear
C)
\[5{{X}^{-}}+XO_{3}^{-}+6{{H}^{+}}\xrightarrow[{}]{{}}3{{X}_{2}}+3{{H}_{2}}O\]
done
clear
D)
\[4P+3NaOH+3{{H}_{2}}O\to \]\[P{{H}_{3}}+3Na{{H}_{2}}P{{O}_{2}}\]
done
clear
View Answer play_arrow
What mass of \[{{H}_{2}}(g)\] is needed to reduce 192 gm. of \[Mo{{O}_{3}}\] to metal? [At. wt. of Mo = 96]
A)
8 gm.
done
clear
B)
16 gm.
done
clear
C)
32 gm.
done
clear
D)
None of these
done
clear
View Answer play_arrow
What is the possible oxidation state of chlorine present in bleaching powder?
A)
+1
done
clear
B)
- 1
done
clear
C)
Both - 1 and +1
done
clear
D)
zero
done
clear
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The oxidation states of S-atoms in Marshell's and Caro's acid are
A)
+6, +7
done
clear
B)
+6, +6
done
clear
C)
+7, +7
done
clear
D)
+4, +4
done
clear
View Answer play_arrow
The most common oxidation state of an element is -2. The number of electrons present in the outermost shell is :
A)
2
done
clear
B)
4
done
clear
C)
6
done
clear
D)
8
done
clear
View Answer play_arrow
In the reaction \[{{A}^{-{{n}_{2}}}}+x{{e}^{-}}\to {{A}^{-{{n}_{1}}}}\] Here \[x\] will be
A)
\[{{n}_{1}}+\text{ }{{n}_{2}}\]
done
clear
B)
\[{{n}_{2}}-\text{ }{{n}_{1}}\]
done
clear
C)
\[{{n}_{1}}-\text{ }{{n}_{2}}\]
done
clear
D)
\[{{n}_{1}}.{{n}_{2}}\]
done
clear
View Answer play_arrow
Conversion of sugar into carbondioxide \[({{C}_{11}}{{H}_{22}}{{O}_{11}}\xrightarrow{{}}C{{O}_{2}})\] is:
A)
Oxidation
done
clear
B)
Reduction
done
clear
C)
Niether oxidation nor reduction
done
clear
D)
Both oxidation and reduction.
done
clear
View Answer play_arrow
Tendency of \[{{l}^{-}},\text{ }B{{r}^{-}},\text{ }C{{l}^{-}}\] and \[{{F}^{-}}\] to be oxidized is in order:
A)
\[{{l}^{-}}>\text{ }B{{r}^{-}}>\text{ }C{{l}^{-}}>{{F}^{-}}\]
done
clear
B)
\[{{l}^{-}}>\text{ }B{{r}^{-}}<\text{ }C{{l}^{-}}<{{F}^{-}}\]
done
clear
C)
\[{{l}^{-}}<C{{l}^{-}}>\text{ }{{F}^{-}}>B{{r}^{-}}\]
done
clear
D)
\[{{l}^{-}}=B{{r}^{-}}>\text{ }C{{l}^{-}}={{F}^{-}}\]
done
clear
View Answer play_arrow
In which of the following compounds, the oxidation number of iodine is fractional:
A)
\[I{{F}_{7}}\]
done
clear
B)
\[I_{3}^{-}\]
done
clear
C)
\[I{{F}_{3}}\]
done
clear
D)
\[I{{F}_{5}}\]
done
clear
View Answer play_arrow
\[6\times {{10}^{-3}}\] mole \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] reacts completely with \[9\times {{10}^{-3}}\] mole of \[{{x}^{n+}}\] to give \[XO_{3}^{-}\] and \[C{{r}^{3+}}\]. Value of n will be
A)
1
done
clear
B)
3
done
clear
C)
2
done
clear
D)
4
done
clear
View Answer play_arrow
Which one of the following is purely reducing agent?
A)
Hydrogen sulphide
done
clear
B)
Hydrogen peroxide
done
clear
C)
Sulphur dioxide
done
clear
D)
Ozone
done
clear
View Answer play_arrow
In which of the following reactions, \[{{H}_{2}}{{O}_{2}}\] acts as a reducing agent?
A)
\[2MnO_{3}^{2-}+6{{H}^{+}}+5{{H}_{2}}O\xrightarrow[{}]{{}}\]\[2M{{n}^{2+}}+8{{H}_{2}}O+5{{O}_{2}}\]
done
clear
B)
\[{{l}_{2}}+{{H}_{2}}{{O}_{2}}+2O{{H}^{+}}\xrightarrow{{}}2{{l}^{-}}+2{{H}_{2}}O+{{O}_{2}}\]
done
clear
C)
\[2MnO_{4}^{-}+3{{H}_{2}}{{O}_{2}}\xrightarrow{{}}2Mn{{O}_{2}}+3{{O}_{2}}+2{{H}_{2}}O\]
done
clear
D)
All of these
done
clear
View Answer play_arrow
On the basis of structure, the two sulphur atoms in \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\] have
A)
+ 2 and + 4 oxidation states
done
clear
B)
- 2 and + 6 oxidation states
done
clear
C)
+ 4 and + 6 oxidation states
done
clear
D)
same oxidation state of two sulphur atoms
done
clear
View Answer play_arrow
Change of hydrogen into proton is:
A)
Reduction of hydrogen
done
clear
B)
Oxidation of Hydrogen
done
clear
C)
Acid-base reaction
done
clear
D)
Displacement reaction
done
clear
View Answer play_arrow
In the following reaction, \[A{{s}_{2}}{{S}_{3}}+{{H}^{+}}+NO_{3}^{-}\xrightarrow{{}}\]\[NO+{{H}_{2}}O+AsO_{4}^{3-}+SO_{4}^{2-},\] the equivalent weight of \[A{{s}_{2}}{{S}_{3}}\] is related to molecular weight by
A)
\[\frac{M}{14}\]
done
clear
B)
\[\frac{M}{28}\]
done
clear
C)
\[\frac{M}{7}\]
done
clear
D)
\[\frac{M}{10}\]
done
clear
View Answer play_arrow
What are the oxidation numbers of carbon in HCN, CO, HNC, respectively?
A)
3, 3, 3
done
clear
B)
3, 2, -3
done
clear
C)
2, 2, 2
done
clear
D)
3, 2, 2
done
clear
View Answer play_arrow
One mole of \[{{X}_{2}}{{H}_{4}}\] releases 10 moles of electrons to form a compound y. What should be the oxidation number of x in the compound y.
A)
+ 3
done
clear
B)
- 3
done
clear
C)
- 6
done
clear
D)
+ 1
done
clear
View Answer play_arrow
Which of the following reaction involves neither oxidation nor reduction
A)
\[CrO_{4}^{2-}\to C{{r}_{2}}O_{7}^{2-}\]
done
clear
B)
\[Cr\to CrC{{l}_{3}}\]
done
clear
C)
\[Na\to N{{a}^{+}}\]
done
clear
D)
\[2{{S}_{2}}O_{3}^{2-}\to {{S}_{4}}O_{6}^{2-}\]
done
clear
View Answer play_arrow
Which of the following acts as an oxidizing as well as reducing agent?
A)
\[N{{a}_{2}}O\]
done
clear
B)
\[N{{a}_{2}}{{O}_{2}}\]
done
clear
C)
\[NaN{{O}_{3}}\]
done
clear
D)
\[NaN{{O}_{2}}\]
done
clear
View Answer play_arrow
What will be the value of x, y and z in the following equation \[{{H}_{2}}{{C}_{2}}{{O}_{4}}+x{{H}_{2}}{{O}_{2}}\xrightarrow[{}]{{}}\]\[yC{{O}_{2}}+z{{H}_{2}}O\]
A)
2, 1, 2
done
clear
B)
1, 2, 2
done
clear
C)
2, 2, 1
done
clear
D)
None of these
done
clear
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Oxidation states of the metal in the minerals hematite and magnetite, respectively, are
A)
II, III in hematite and II in magnetite
done
clear
B)
II, III in hematite and II in magnetite
done
clear
C)
II in hematite and II, II in magnetite
done
clear
D)
III in hematite and II, III in magnetite
done
clear
View Answer play_arrow
\[Mn{{O}_{4}}^{2-}\] undergoes disproportionation reaction in acidic medium but \[Mn{{O}_{4}}^{-}\] does not because
A)
In \[Mn{{O}_{4}}^{2-}Mn\] is in intermediate oxidation state
done
clear
B)
In \[Mn{{O}_{4}}^{2-},Mn\] is in lowest oxidation state
done
clear
C)
In \[Mn{{O}_{4}}^{2-},Mn\] is in intermediate oxidation state
done
clear
D)
None of the above
done
clear
View Answer play_arrow
