JEE Chemistry - Redox Reactions and Electrochemistry

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Question - 1

Oxidation is defined as

  • A lose of electrons
  • B gain of electrons
  • C gain of protons
  • D lose of neutrons

Question - 2

Which one the following statement is correct?

  • A Oxidation of a substance is followed by the reduction of another
  • B Reduction of a substance is followed by the oxidation of another
  • C Oxidation and reduction are complementary reactions.
  • D It is not necessary that both oxidation and reduction should take place in the same reaction

Question - 3

Which one of the following reactions is not a redox reaction?

  • A \(Ag^++Cl^-\longrightarrow Ag^+Cl^-\)
  • B \(Zn(s)+Cu^{2+}(aq)\longrightarrow Zn^{2+}(aq)+Cu(s)\)
  • C \(2Mg(s)+O_2(g)\longrightarrow 2Mgo\)
  • D \(FeO+C\longrightarrow Fe+Co\)

Question - 4

Which of the following elements does not show disproportionation tendency?

  • A CI
  • B Br
  • C F
  • D I

Question - 5

Match of following and choose the correct option.

Column I Column II
A. Ions having positive charge 1. +7
B. The sum of oxidation number of all atoms in a neutral molecule 2. -1
C. Oxidation number of hydrogen ion \((H^+)\) 3. +1
D. Oxidation number of fluorine in NaF 4. 0
E. Ions having negative charge 5. Cation
  6. Anion
  • A A B C D E 5 4 3 2 6
  • B A B C D E 1 3 4 6 5
  • C A B C D E 5 3 4 6 2
  • D A B C D E 1 4 3 6 5

Question - 6

Of the following elements, which one has the same oxidation state in all of its compounds?

  • A Hydrogen
  • B Fluorine
  • C Nitrogen
  • D Oxygen

Question - 7

What is the oxidation number of Man in \(K_2MnO_4?\)

  • A 4
  • B 5
  • C 6
  • D 7

Question - 8

In which of the following compounds, an element exhibits two different oxidation states?

  • A \(NH_2OH\)
  • B \(NH_2NO_3\)
  • C \(N_2H_4\)
  • D \(N_3H\)

Question - 9

The oxidation state of phosphorus varies from

  • A - 1 to + 2
  • B - 3 to + 3
  • C - 3 to + 5
  • D - 5 to + 1

Question - 10

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 \(3d^14s^2\)
  • B \(3d^34s^2\)
  • C \(3d^54s^1\)
  • D \(3d^54s^2\)
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