Which of the following is the relative molecular mass of a compound which has empirical formula CH₂O? (H = 1; C = 12; O = 16)

• A. 42
• B. 45
• C. 126
• D. 180

A. the natural tendency for a system to achieve a greater disorder

• A. H₂S
• B. SO₂
• C. HCI
• D. SO₃

Bronze is an alloy of?

• A. silver and copper
• B. silver and gold
• C. copper and nickle
• D. copper and tin

A liquid that will dissolve fat is?

• A. Hydrochloric acid
• B. Calcium hydroxide
• C. Kerosene
• D. Water

How many molecules are there in 14g of nitrogen gas at s.t.p? (n = 14, Avogadro Number = 6. 0 x 10²³mol^-1)

• A. 1.2 x10²³
• B. 3.0 x10²³
• C. 6.0 x10²³
• D. 1.2 x 10²⁴

Which of the following terms indicates the number of bonds that can be formed by an atom?

• A. Oxidation number
• B. Valence
• C. Atomic number
• D. Electronegativity

Which of these statements is TRUE about carbon (IV) oxide?

• A. it supports combustion
• B. It is strongly acidic in water
• C. It is very soluble in water
• D. It supports the buring of magnesium to produce magnesium oxide

The commonest feature of reactions at the anode is that

• A. electrons are consumed
• B. oxidation is involved
• C. ions are reduced
• D. electrode dissolves

Which of the following statements is correct?

• A. Covalent compounds would readily ionize in solution
• B. Covalent compounds consist of ions
• C. Hydrogen bond is formed between a metal and a non-metal
• D. Ionic compounds in solution would conduct electricity

Catalytic hydrogenation of oils results in the production of

• A) soaps
• B) detergents
• C) alkanes
• D) margarine