Redox Reactions · JEE Main previous year questions

2019 7 questions

1. Q802019 · 12 Apr 2019 · Shift 1

   An example of a disproportionation reaction is :

   1. A.$2\text{NaBr}+{\text{Cl}}_2\to 2\text{NaCl}+{\text{Br}}_2$
   2. B.$2{\text{KMnO}}_4\to {\text{K}}_2{\text{MnO}}_4+{\text{MnO}}_2+{\text{O}}_2$
   3. C.$2\text{CuBr}\to {\text{CuBr}}_2+\text{Cu}$
   4. D.$2{\text{MnO}}_4^{-}+10{\text{I}}^{-}+16{\text{H}}^{+}\to 2{\text{Mn}}^{2+}+5{\text{I}}_2+8{\text{H}}_2\text{O}$
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   Answer: C

2. Q662019 · 10 Apr 2019 · Shift 2

   The highest possible oxidation states of uranium and plutonium, respectively are :

   1. A.4 and 6
   2. B.6 and 4
   3. C.7 and 6
   4. D.6 and 7
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   Answer: D

3. Q612019 · 9 Apr 2019 · Shift 1

   The correct order of the oxidation states of nitrogen in NO, ${\mathrm{N}}_2\mathrm{O}$, $\mathrm{N}{\mathrm{O}}_2$ and ${\mathrm{N}}_2{\mathrm{O}}_3$ is :

   1. A.$\mathrm{N}{\mathrm{O}}_2<\mathrm{NO}<{\mathrm{N}}_2{\mathrm{O}}_3<{\mathrm{N}}_2\mathrm{O}$
   2. B.$\mathrm{N}{\mathrm{O}}_2<{\mathrm{N}}_2{\mathrm{O}}_3<\mathrm{NO}<{\mathrm{N}}_2\mathrm{O}$
   3. C.${\mathrm{N}}_2\mathrm{O}<\mathrm{NO}<{\mathrm{N}}_2{\mathrm{O}}_3<\mathrm{N}{\mathrm{O}}_2$
   4. D.${\mathrm{N}}_2\mathrm{O}<{\mathrm{N}}_2{\mathrm{O}}_3<\mathrm{NO}<\mathrm{N}{\mathrm{O}}_2$
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   Answer: C

4. Q742019 · 9 Apr 2019 · Shift 2

   The maximum number of possible oxidation states of actinoides are shown by :

   1. A.nobelium (No) and lawrencium (Lr)
   2. B.actinium (Ac) and thorium (Th)
   3. C.neptunium (Np) and plutonium (Pu)
   4. D.berkelium (Bk) and californium (Cf)
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   Answer: C

5. Q832019 · 12 Jan 2019 · Shift 1

   Iodine reacts with concentrated $\mathrm{HN}{\mathrm{O}}_3$ to yield Y along with other products. The oxidation state of iodine in Y, is :

   1. A.3
   2. B.1
   3. C.7
   4. D.5
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   Answer: D

6. Q892019 · 11 Jan 2019 · Shift 2

   The relative stability of +1 oxidation state of group 13 elements follows the order :

   1. A.Tl < In < Ga < Al
   2. B.Al < Ga < Tl < In
   3. C.Al < Ga < In < Tl
   4. D.Ga < Al < In < Tl
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   Answer: C

7. Q702019 · 9 Jan 2019 · Shift 1

   Aluminium is usually found in +3 oxidation state. In contrast, thallium exists in + 1 and + 3 oxidation states. This is due to :

   1. A.inert pair effect
   2. B.diagonal relationship
   3. C.lattice structure
   4. D.lanthanoid contraction
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   Answer: A