question_answer 1) Oxidation state of Fe in \[F{{e}_{3}}{{O}_{4}}\]is: [AIPMT 1999]
A)
\[\frac{3}{2}\]
done
clear
B)
\[\frac{4}{5}\]
done
clear
C)
\[\frac{5}{4}\]
done
clear
D)
\[\frac{8}{3}\]
done
clear
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question_answer 2) In which of the following compounds transition metal has zero oxidation state? [AIPMT 1999]
A)
\[[Fe{{(CO)}_{5}}]\]
done
clear
B)
\[N{{H}_{2}}.N{{H}_{2}}\]
done
clear
C)
\[NOCl{{O}_{4}}\]
done
clear
D)
\[Cr{{O}_{5}}\]
done
clear
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question_answer 3) A compound contains atoms of three elements A, B and C. If the oxidation number of A is +2, B is +5, and that of C is -2, the possible formula of the compound is: [AIPMT 2000]
A)
\[{{A}_{2}}{{(B{{C}_{3}})}_{2}}\]
done
clear
B)
\[{{A}_{3}}{{(B{{C}_{4}})}_{2}}\]
done
clear
C)
\[{{A}_{3}}{{({{B}_{4}}C)}_{2}}\]
done
clear
D)
\[AB{{C}_{2}}\]
done
clear
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question_answer 4) The oxidation states of sulphur in the anions \[SO_{3}^{2-},\,{{S}_{2}}O_{4}^{2-}\] and \[{{S}_{2}}O_{6}^{2-}\] follow the order: [AIPMT 2003]
A)
\[{{S}_{2}}O_{4}^{2-}<{{S}_{2}}O_{6}^{2-}<SO_{3}^{2-}\]
done
clear
B)
\[{{S}_{2}}O_{6}^{2-}<{{S}_{2}}O_{4}^{2-}<SO_{3}^{2-}\]
done
clear
C)
\[{{S}_{2}}O_{4}^{2-}<SO_{3}^{2-}<{{S}_{2}}O_{6}^{2-}\]
done
clear
D)
\[SO_{3}^{2-}<{{S}_{2}}O_{4}^{2-}<{{S}_{2}}O_{6}^{2-}\]
done
clear
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question_answer 5) Oxidation numbers of P in \[PO_{3}^{4-}\] of S in \[SO_{3}^{2-}\] and that of Cr in \[C{{r}_{2}}O_{7}^{2-}\] are respectively, [AIPMT (S) 2009]
A)
+5, +6 and +6
done
clear
B)
+3, +6 and +5
done
clear
C)
+5, +3 and +6
done
clear
D)
-3, +6 and +6
done
clear
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question_answer 6) Oxidation states of P in \[{{H}_{4}}{{P}_{2}}{{O}_{5}},\,{{H}_{4}}{{P}_{2}}{{O}_{6}},\]\[{{H}_{4}}{{P}_{2}}{{O}_{7}},\] are respectively [AIPMT (S) 2010]
A)
+ 3, + 5, + 4
done
clear
B)
+ 5, + 3, + 4
done
clear
C)
+ 5, + 4, + 3
done
clear
D)
+ 3, + 4, + 5
done
clear
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question_answer 7) In which of the following compounds, nitrogen exhibits highest oxidation state? [AIPMT (S) 2012]
A)
\[{{N}_{2}}{{H}_{4}}\]
done
clear
B)
\[N{{H}_{3}}\]
done
clear
C)
\[{{N}_{3}}H\]
done
clear
D)
\[N{{H}_{2}}OH\]
done
clear
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question_answer 8) When \[0.1\,\,mol\,\,MnO_{4}^{2-}\] is oxidised, the quantity of electricity required to completely oxidise \[MnO_{4}^{2-}\] is \[MnO_{4}^{-}\] [AIPMT 2014]
A)
96500 C
done
clear
B)
\[2\times 96500\,C\]
done
clear
C)
9650 C
done
clear
D)
96.50 C
done
clear
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question_answer 9) The pair of compounds that can exist together is [AIPMT 2014]
A)
\[FeC{{l}_{3}},SnC{{l}_{2}}\]
done
clear
B)
\[HgC{{l}_{2}},SnC{{l}_{2}}\]
done
clear
C)
\[FeC{{l}_{2}},SnC{{l}_{2}}\]
done
clear
D)
\[FeC{{l}_{3}},Kl\]
done
clear
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question_answer 10) In acidic medium, \[{{H}_{2}}{{O}_{2}}\] changes \[C{{r}_{2}}O_{7}^{2-}\] to \[Cr{{O}_{5}}\] which has two \[(OO)\] bonds. Oxidation state of Cr in \[Cr{{O}_{5}}\] is [AIPMT 2014]
A)
+ 5
done
clear
B)
+3
done
clear
C)
+ 6
done
clear
D)
- 10
done
clear
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question_answer 11)
(I) \[{{H}_{2}}{{O}_{2}}\,+{{O}_{3}}\,\xrightarrow{\,}\,{{H}_{2}}O\,+2{{O}_{2}}\] (II) \[{{H}_{2}}{{O}_{2}}+A{{g}_{2}}O\to 2Ag+{{H}_{2}}O+{{O}_{2}}\] Role of hydrogen peroxide in the above reactions is respectively [AIPMT 2014]
A)
oxidising in (I) and reducing in (II)
done
clear
B)
reducing in (I) and oxidizing in (II)
done
clear
C)
reducing in (I) and (II)
done
clear
D)
oxidising in (I) and (II)
done
clear
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question_answer 12) Which of the following processes does not involve oxidation of iron? [NEET 2015]
A)
Rusting of iron sheets
done
clear
B)
Decolourisation of blue \[CuS{{O}_{4}}\] solution by iron
done
clear
C)
Formation of \[Fe{{(CO)}_{5}}\] from Fe
done
clear
D)
Liberation of Hg from steam by iron a high temperature
done
clear
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question_answer 13) The correct order of N-compounds in its decreasing order of oxidation states is [NEET - 2018]
A)
\[\text{HN}{{\text{O}}_{\text{3}}}\text{,N}{{\text{H}}_{\text{4}}}\text{Cl,NO,}{{\text{N}}_{\text{2}}}\]
done
clear
B)
\[\text{HN}{{\text{O}}_{\text{3}}}\text{,NO,N}{{\text{H}}_{\text{4}}}\text{Cl,}{{\text{N}}_{\text{2}}}\]
done
clear
C)
\[\text{HN}{{\text{O}}_{\text{3}}}\text{,NO,}{{\text{N}}_{\text{2}}}\text{,N}{{\text{H}}_{\text{4}}}\text{Cl}\]
done
clear
D)
\[\text{N}{{\text{H}}_{\text{4}}}\text{Cl,}{{\text{N}}_{\text{2}}}\text{,NO,HN}{{\text{O}}_{\text{3}}}\]
done
clear
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question_answer 14) The correction factor 'a' to the ideal gas equation corresponds to [NEET - 2018]
A)
Electric field present between the gas molecules
done
clear
B)
Volume of the gas molecules
done
clear
C)
Density of the gas molecules
done
clear
D)
Forces of attraction between the gas molecules
done
clear
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question_answer 15)
Which of the following reactions are disproportionation reaction? [NEET 2019] (i) \[2C{{u}^{+}}\to C{{u}^{2}}+C{{u}^{0}}\] (ii) \[3MnO_{4}^{2+}+4{{H}^{+}}\to 2MnO_{_{4}}^{-}+Mn{{O}_{2}}\] \[+2{{H}_{2}}O\] (iii) \[2KMn{{O}_{4}}\xrightarrow{\Delta }{{K}_{2}}Mn{{O}_{4}}+Mn{{O}_{2}}\] \[+{{O}_{2}}\] (iv) \[2MnO_{4}^{-}+3M{{n}^{2+}}+2{{H}_{2}}O\to 5Mn{{O}_{2}}\] \[+4{{H}^{\oplus }}\] Select the correct option from the following:
A)
(i), (iii) and (iv)
done
clear
B)
(i) and (iv) only
done
clear
C)
(i) and (ii) only
done
clear
D)
(i), (ii) and (iii)
done
clear
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question_answer 16) What is the change in oxidation number of carbon in the following reaction? [NEET 2020] \[C{{H}_{4}}(g)+4C{{l}_{2}}(g)\to CC{{l}_{4}}(l)+4HCl(g)\]
A)
0 to + 4
done
clear
B)
- 4 to + 4
done
clear
C)
0 to - 4
done
clear
D)
+ 4 to + 4
done
clear
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