Chapter 8 : Redox Reactions

Question 1

Define oxidation

Answer 1

Loss of electrons by any species

Question 2

Define reduction

Answer 2

Gain of electron by any species

Question 3

Reducing agent donate electrons.T/F

Answer 3

True

Question 4

Oxidation is gain of electrons.T/F

Answer 4

False

Question 5

Copper + zinc+2 gives zinc + copper+2.T/F

Answer 5

False

Question 6

Arrange Cu, Ag, Zn in the order of electron releasing tendency

Answer 6

Zn greater than Cu greater than Ag

Question 7

In superoxide oxidation number of zero is

Answer 7

-1/2

Question 8

Oxidation number of O in OF2 and O2F2 is

Answer 8

+2 in OF2 and +1 in O2F2

Question 9

In peroxide oxidation number of O is

Answer 9

-1

Question 10

Oxidation number of h in LiH is

Answer 10

-1

Question 11

In all its compounds, oxidation number of F is -1.T/F

Answer 11

True

Question 12

Oxidation State denote the oxidation number of the compound.T/F

Answer 12

False, oxidation number denotes the oxidation state of the compound

Question 13

Define oxidase oxidizing agent.

Answer 13

A reagent which can increase the oxidation number of an element in a given substance

Question 14

Define reducing agent.

Answer 14

Reagent which lowers the oxidation number of an element in given substance

Question 15

P4+ OH- +H2O gives

Answer 15

PH3 + H2PO2-

Question 16

S8 + OH- Gives

Answer 16

S2- + S2O3 2-

Question 17

Cl2 + OH- gives

Answer 17

ClO- + Cl-

Question 18

F2 + OH-

Answer 18

F- + OF2 + H2O

Question 19

Which of the following will not show disproportionation reaction. ClO-, ClO2-, ClO3-, ClO4-

Answer 19

ClO4-

Question 20

Write the net ionic equation of the reaction of potassium dichromate(VI), K2Cr2O7 with sodium sulphide, NaSO3 in an acid solution to give chromium(III) ion and the sulphate ion

Answer 20

Cr2O7 2- (aq) + …..

Question 21

Permagnent ion MnO4- in basis solution oxidize iodide ion, I- to produce molecular iodine and manganese oxide write a balance ionic equation to represent this Redox reaction

Answer 21

6I- (aq) + ….

Question 22

Solved Bridge contains

Answer 22

YouTube containing a solution of KCl or NH4NO3 usually solidified by boiling with agar agar and letter cooling to a jelly like substance

Question 23

What is the function of Salt Bridge

Answer 23

To make the both half cell electrically neutral (as electron will flow from one week at to another it will cause development of electric potential opposite of the current flow direction. To break this potential Salt Bridge is used)

Question 24

What is the standard electrode potential

Answer 24

If the concentration of each species take part in the electrode reaction is unity (if any gas appears in electrode reaction it is confirmed to a atmospheric pressure) and further the reaction is carried out at 298 Kelvin, then the potential of each electrod said to be the Standard electrod potential

Question 25

A negative E couple in a vehicle reducing agent then the H+/H2 couple.T/F

Answer 25

False