Section 3

A piece of calcium was added to some distilled water in a container and the following observations were recorded.

1. The reaction was rapid.

2. Bubbles of gas evolved

3. A cloudy suspension formed.

4. The temperature increased.

The gas produced is expected to

• Relight a glowing splint

• Give a ‘pop’ with a lighted splint

• Turn acidified aqueous potassium dichromate green

• Decolonize acidified aqueous potassium manganate(VII)

Which of the following metals will NOT displace hydrogen from dilute hydrochloric acid?

• Zinc

• Iron

• Copper

• Aluminium

Which metal appears between copper and aluminium in the reactivity series and is an important component in haemoglobin?

• Magnesium

• Lead

• Zinc

• Iron

Which of the following statements about sulfur are true?

I. It is used in the vulcanization of rubber.

II. It is used in the extraction of iron from iron ore.

III. It is used in the manufacturing of explosives.

• I and II only

• I and III only

• II and III only

• I, II and III

Which of the following gases shows NO reaction with moist litmus paper?

• Ammonia

• Hydrogen

• Sulfur dioxide

• Hydrogen sulfide

A suitable drying agent for a laboratory preparation of ammonia is

• calcium oxide

• calcium chloride

• anhydrous copper sulfate

• concentrated sulfuric acid

Which of the following statements is true of carbon monoxide?

• It is an acidic gas

• It is very soluble in water

• It turns lime water milky

• It reduces iron(II) oxide

Which of the following metals is an important constituent of chlorophyll?

• Iron

• Copper

• Calcium

• Magnesium

Which of the metals is LIKELY to form a soluble hydroxide?

• W

• X

• Z

• Y

In which of the following pairs of metals is the first metal MOST likely to displace the second metal from solution?

• W,X

• X,Y

• Z,Y

• Z, X