When chlorine is added to slaked lime, the product obtained is

• A. bleaching powder
• B. chlorinated water
• C. hydrochloric acid
• D. oxochlorate (l) acid

(a) List two properties of alpha particles.

(b) X is an element which exists as an isotopic mixture containing 90% of \(^{39}_{19} X\) and 10% of \(^{41}_{19}X\).

(i) How many neutrons are present in the isotope \(^{41}_{19}X\)?

(ii) Calculate the mean relative atomic mass of X.

Which of the following when heated strongly in air will leave a metal as residue?

• A. Sodium trioxonitrate (V)
• B. Potassium trioxonitrate (V)
• C. Silver trioxonitrate (V)
• D. Lead (ll) trrioxonitrate(V)

An atom 17 protons, 17 electrons and 18 neutrons has a mass number of

• A. 17
• B. 18
• C. 34
• D. 35

In linear molecules, the bond angle is

• A. 90°
• B. 140°
• C. 109°
• D. 180°

The following oxides react with both acids and bases to form salts except

• A. zinc oxide
• B. lead (ll) oxide
• C. aluminium oxide
• D. carbon (Iv) oxide

The phenomenon observed when dust particles collide randomly in a beam of sunlight is known as

• A. Tyndal effect
• A. Tyndal effect B. diffusion
• C. osmosis
• D. brownian movement

Which of the following is an ore of aluminium?

• A. Haematite
• B. Magnetite
• C. Siderite
• D. Bauxite

The by-product of the fermentation of sugar to ethanol is

• A. propane -1,2,3-triol
• B. ethyl ethanoate
• C. ethanedioc acid
• D. carbon (lV) oxide

(a) State Gay Lussac's law of combining volumes

(b) Hydrogen reacts with oxygen according to the following equation;

2H\(_{2(g)}\) + O\(_{2(g)}\) ---> 2H\(_2\)O\(_{(g)}\). If 50cm\(^3\) of hydrogen were sparked with 30cm\(^{3}\) of oxygen, calculate the volume of unused oxygen after cooling to the initial temperature and pressure.