(a)(i) What is an acid?

(ii) List three chemical properties of tetraoxosulphate (VI) acid

(iii) Give two uses of tetraoxosulphate (VI) acid.

(b)(i) Describe a suitable laboratory procedure for preparing a sample of zinc tetraoxosulphate (VI) crystals, starting from zinc oxide.

(ii) Write two equations to show why zinc oxide is classified as an amphoteric oxide.

(c) Zinc reacts with copper (II) tetraoxosulphate (VI) according to the following equation: Zn + CuSO\(_4\) -> ZnSO\(_4\) + Cu

(i) State the type of reaction involved

(ii) Determine the mass of zinc that would react completely with 8.0g of copper (II) tetraoxosulphate (VI). [CuSO\(_4\) = 160; Zn = 65]

In the extraction of sodium from fused sodium chloride, the anode is made of platinum because

• A) sodium is formed at the anode
• B) chlorine is formed at the anode
• C) sodium does not react with platinum
• D) chlorine does not react with platinum

Which of these compounds is a chloroform?

• A) CH₃Cl
• B) CH₂Cl
• C) CHCl₃
• D) CCl₄

When 50cm² of a saturated solution of sugar of molar mass 342 g at 40oC was evaporated to dryness, 34.2g of dry solid was obtained. The solubility of sugar at 40oC is

• A. 2.0 mol dm^-3
• B. 3.5 mol dm^-3
• C. 7.0 mol dm^-3
• D. 10.0 mol dm^-3

The maximum number of electrons in the L shell of an atom is

• A) 2
• B) 8
• C) 18
• D) 32

How many moles of (H+) are there in 1dm³ of 0.5M solution of H₂SO₄?

• A) 2.0moles
• B) 1.0moles
• C) 0.5mole
• D) 0.25moles

The refreshing characteristic taste of fizzy drinks is due ot the presence of

• A. Carbon(IV)oxide
• B. Glucose
• C. Hydrogen
• D. Sodium Citrate

Sieving is a technique used to separate mixtures containing solid particles of

• A) small sizes
• B) large sizes
• C) different sizes
• D) the same size

The high solubility of ethanol in water is due to its

• A. low boiling point
• B. low freezing point
• C. covalent nature
• D. hydrogen bonding

(a) Give one disadvantage of:

(i) hard water

(ii) soft water

(b) Explain why the degree of hardness in a sample of clear lime water is higher than in another sample has that been turned milky by carbon (IV) oxide.