Oxidation-Reduction

Question 1

Chemical reaction involves a change in the balance number of reacting substance.

Answer 1

Oxidation-Reduction

Question 2

GEROA

Answer 2

Gain of e-
Reduction
Oxidizing Agents

Question 3

LEORA

Answer 3

Loss of Electrons
Oxidation
Reducing Agent

Question 4

Methods of Redox Reaction

Answer 4

Permanganometry

Question 4

Methods of ReDox

Answer 4

Permanganometry
Cerimetry
Iodimetry-Iodometry

Question 5

Volumetric Solution in Permanganate method

Answer 5

KMnO4

Question 6

Primary Standard used in Permanganometry

Answer 6

Sodium Oxalate

Question 7

Indicator used in Permanganometry

Answer 7

KMnO4 - Self indicating

Question 8

Endpoint in Permanganometry

Answer 8

Pink Color

Question 9

Direct Titration in Permanganometry

Answer 9

H2O2, TiO2

Question 10

Indirect titration in Permanganometry

Answer 10

Malic Acid in Cherry Juice ⭐

Question 11

Residual Titration in Permanganometry

Answer 11

Sodium nitrite
Pb monoxide
NaNO2

Question 12

Addition of Sulfuric Acid in Permanganate Method

Answer 12

Keep the Hydrogen ion concentration throughout the titration
Prevent formation of Manganese dioxide
Supply Hydrogen ion used up in reduction of Permanganate ion.

Question 13

Most effective chemical substance in removing stains of KMnO4

Answer 13

Oxalic Acid

Question 13

Most effective chemical substance in removing stains of KMnO4

Answer 13

Oxalic Acid

Question 14

Potassium permanganate

Answer 14

Mineral chameleon

Question 15

Number of electrons gained by KMnO4

Answer 15

5 e-

Question 16

Volumetric Solution in Cerimetry ⭐

Answer 16

Ceric sulfate (Oxidizing Agent)

Question 17

Primary Standard in Cerimetry

Answer 17

Arsenic trioxide (As2O3)

Question 18

Indicator used in Cerimetry

Answer 18

Orthophenanthroline in FeSO4 (Ferrous Phenanthroline)

Question 18

Endpoint in Cerimetry

Answer 18

Red to Blue (Ferroin to Ferritin)

Question 19

Analyte used for Direct Titration in Cerimetry

Answer 19

Menadiol, Ferrous SO4, Hydroquinone

Question 20

orthophenanthroline in ferrous sulfate solution

Answer 20

Form a ferrous complex - Ferroin (Ferrous phenanthroline)

Question 21

Color of complex resulting from reaction with ferrous phenanthroline

Answer 21

Red

Question 22

Iodimetry

Answer 22

Analyte/Assay: Reducing Agent Titration: Direct titration VS: Iodine Soln, Sodium thiosulfate Primary standard: Arsenic trioxide Indicator: Starch TS (Added at start) Endpoint: Blue Color

Question 23

Samples used in Iodimetry

Answer 23

Direct: Ascorbic Acid, Arsenious Acid, Potassium tartrate Residual: Sodium bisulfide , Methionine

Question 24

Iodometry

Answer 24

Analyte/Assay: Oxidizing Agent Titration: Indirect titration VS: Sodium thiosulfate Primary standard: Potassium dichromate Indicator: Starch TS (Added berfore reaching end point) Endpoint: Disappearance of blue color

Question 25

Samples used in Iodometry

Answer 25

Na hypochlorite Selenium sulfide Cupric sulfate

Question 26

TF: Iodine Solution is soluble in water Does not dissolve readily in presence of KI because of triiodide ion formation Iodine solutions used in iodimetry are solutions of iodine in potassium iodide soln.

Answer 26

False. Iodine is not soluble in water False. Dissolves readily in presence of KI because of triiodide ion formation (KI - Solubilizing agent) True

Question 27

Standardization of Arsenic trioxide

Answer 27

As2O3 is dissolved in 1N Sodium hydroxide

Question 28

This substance is added to neutralize/buffer the hydroiodic acid, causing the reaction to be completed

Answer 28

Sodium bicarbonate

Question 29

Use of boiling of Sodium thiosulfate in standardization of Iodine Solution

Answer 29

For sterilization If carbonic acid, expels CO2 - causing hydrolysis and decomposition

Question 30

Addition of sodium carbonate in Iodine Standardization

Answer 30

Preservative Prevents acid catalyzed hydrolysis

Question 31

Employed whn ASCORBIC ACID is present in a multi vitamin preparation

Answer 31

Dichlorophenol-indophenol Titration

Question 32

Volumetric Solution used in Dichlorophenol-indophenol Titration

Answer 32

Dichlorophenol-indophenol Solution

Question 33

Primary standard used in Dichlorophenol-indophenol Titration

Answer 33

USP Ascorbic Acid Reference Std.

Question 34

Indicator used in Dichlorophenol-indophenol Titration

Answer 34

Dichlorophenol-indophenol Basic: Blue Acidic: Red

Question 35

Endpoint in Dichlorophenol-indophenol Titration

Answer 35

Distinct rose-pink (Persist 5 secs)

Question 36

Samples in Dichlorophenol-indophenol Titration

Answer 36

Ascorbic Acid (Tablet, Injection, Hexavit, Decavit)

Question 37

Bromine Method

Answer 37

0.1N Bromine as an oxidizing agent in place of iodine

Question 38

Production of water insoluble bromine substitution products such as

Answer 38

Tribromoaniline Tribromophenol

Question 39

Bromine Method assay compounds such as

Answer 39

Aniline Phenol Resorcinol

Question 40

Bromine Method VS

Answer 40

0.1N Bromine Solution (Koppeschaar's Soln)

Question 41

Bromine Method Primary Std, Indicator, Samples

Answer 41

Primary Std: 0.1N Na thiosulfate Indicator: Starch TS Samples: Phenol, Thymol

Question 42

Assay for sulfonamide drugs and other compounds containing Arylamines

Answer 42

Diazotization with nitrite

Question 43

Diazotization

Answer 43

VS: 0.1N Sodium nitrite Primary Std: Sulfanilamide Endpoint: Blue ring (Starch iodide paper) Samples: Benzocaine, Procainamide