In an electrochemical cell, polarization is caused by
• A. Oxygen
• B. Hydrogen
• C. Tetraoxosulphate(IV) acid
• D. Chlorine

The condition required for corrosion to take place is the presence of
• A. Oxygen and Carbon (IV) oxide
• B. Water and Oxygen
• C. Water and Carbon (IV) oxide and Oxygen
• D. Water and Carbon (IV) oxide

The enzyme used in the hydrolysis of starch to dextrin and maltose is
• A. Zymase
• B. Sucrase
• C. Amylase
• D. Lactase

In the laboratory preparation of chlorine from concentrated hydrochloric acid in the presence of potassuim tetraoxomanganate(VII) the produced is dried by passing it through
• A. Concentrated tetraoxosulphate (VI) acid
• B. Anhydrous calcium chloride
• C. Calcium oxide
• D. Sodium hydroxide

The monomer of nylon is
• A. Hydroxybenzene
• B. Hexanedioic acid
• C. Benzene -1,-4-dicarboxylic acid
• D. Ethane-1,2-diol

The principle of column chromatography is based on the ability of the constituents to
• A. React with the solvent in the column
• B. React with each other in the solvent in the column
• C. Dissolve in each other in the column
• D. Move at different speeds in the column

Ammonium chloride can be separated from its mixture with common salt by
• A. Distillation
• B. Evaporation
• C. Decantation
• D. Sublimation

The ability of carbon to form long chains is referred to as
• A. Alkylation
• B. Acylation
• C. Carbonation
• D. Catenation

The industrial preparation of hydrogen gas from water gas is referred to as
• A. Bosch process
• B. Contact process
• C. Haber process
• D. Bayer Process

The relative atomic mass of a naturally occurring lithium consisting of 90%$$\frac{7}{3}$$Li and 10%$$\frac{6}{3}$$Li is

• A. 6.2
• B. 6.8
• C. 7.1
• D. 6.9