Limit test for iron

The formulea of ferric ammonium sulphate is

• NH4Fe(SO4)2·10 H2O

• NH4Fe(SO4)2·12 H2O

• NH4Fe(SO4)2·14 H2O

• NH4Fe(SO4)2·16 H2O

citric acid acts as a

• acidifying agent

• binding agent

• chelating agent

• alkalizing agent

Chelating agents are also known as

• buffering agent

• antitussives agent

• laxative agent

• sequestering agents

A tricarboxylic acid that is 

• 3-hydroxy propane-1,2,3-tricarboxylic acid3

• 2-hydroxy propane-1,2,3-tricarboxylic acid

• 2-hydroxy propane-1,2 dicarboxylic acid

• 2-hydroxy propane-1,3-Dicarboxylic acid

Thio glycollic acid is useful analogue of

• glycolic acid

• Acetic acid

• glyoxallic acid

• gluconic acid

—pale pink to deep reddish purple colour is formed due to the f

• Ferric thioglycolate complex.

• Ferroin thioglycolate complex.

• Ferrous thioglycollic acid complex.

• Ferrous thioglycolate complex.

standard used in limit test for iron is

• Ferrous ammonium sulphate

• Ferric ammonium sulphate

• Ferric ammonium sulphide

• Ferric ammonium sulphite

The colour develops only in the presence of

• acid

• water

• enzyme

• alkali

Thio glycollic acid act as

• Oxidising gent

• Reducing agent

• Dehydrating agent

• Catalyst

Ferrous thioglycollate complex is colorless in

• Basic solution

• Cold condition

• Hot condition

• acidic or neutral