### Chemistry - Redox Reaction

#### 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 of the following is not an example of redox reaction?

• A $CuO+h_2\rightarrow Cu+H_2O$
• B $Fe_2O_3+3CO\rightarrow 2Fe+3CO_2$
• C $2K+F_2\rightarrow 2KF$
• D $BaCl_2+H_2SO_4\rightarrow BaSO_4+2HCl$

#### Question - 4

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 - 5

Identify disproportionation reaction.

• A $CH_4+2O_2\longrightarrow CO_2+2H_2O$
• B $CH_4+4Cl_2\longrightarrow CCl_4+4HCl$
• C $2F_2+2OH^-\longrightarrow 2F^-+OF_2+H_2O$
• D $2NO_2+20H^- \longrightarrow NO^-_2+NO^-_3+H_2O$

#### Question - 6

Which of the following elements does not show disproportionation tendency?

• A CI
• B Br
• C F
• D I

#### Question - 7

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 - 8

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 - 9

What is the oxidation number of Man in $K_2MnO_4?$

• A 4
• B 5
• C 6
• D 7

#### Question - 10

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 $N_3H$