The enzyme that catalyses the conversion of glucose te ethanol and carbon (IV) oxide is

• A. diastase
• B. maltase
• C. ptyalin
• D. zymase

Oxochlorate(I) acid is used as a bleaching agent because it is

• A. a weak acid
• B. a reducing agent.
• C. an oxidizing agent
• D. a strong acid.

Which of the following processes takes place during the production of margarine from vegetable oils?

• A. Esterification
• B. Hydrolysis
• C. Hydrogenation
• D. Saponification

The removal of rust from iron by treatment with tetraoxosulphate (IV) acid is based on the?

• A. hydrolysis of the iron
• B. reaction of acid with base
• C. oxidationof the rust
• D. dehydration of the iron

How many lone pairs of electrons are there on the central atom of the molecule?

• A) 1
• B) 2
• C) 3
• D) 4

When steam is passed over red-hot carbon, the substances produced are

• A. Hydrogen and trioxocarbonate (IV) acid
• B. Hydrogen, oxygen and carbon (IV) oxide
• C. Hydrogen and carbon (II) oxide
• D. Hydrogen and carbon (IV) oxide

Which of the following industrial processes depends on the action of enzymes?

• A. Liquefaction of air
• B. Manufacture of soap
• C. Brewing of beer
• D. Catalytic cracking

The preferential discharge of ions during electrolysis is influenced by the

• A. mechanism of electrolysis
• B. electrolytic reactions
• C. nature of the electrode
• D. type of electrolytic cell

A suitable solvent for iodine and nephthalene is

• A) carbon (IV) sulphide
• B) ethanol
• C) water
• D) benzene

The air around a petroleum refinery is most likely to contain.

• A)
  CO\(_2\), SO\(_3\) and N\(_2\)O
• B)
  CO\(_2\), CO and N\(_2\)O
• C)
  SO\(_2\), CO and NO\(_2\)
• D)
  PH\(_3\), H\(_2\)O and CO\(_2\)