Chemistry MCQ Set 2

What could be the melting point of compound E?

• A

• B

• C

• D

What is the best way of recovering the pure solvent from the washings?

• distillation

• filtration

• chromatography

• freezing

Which element forms ions that have the same electronic structure as argon atoms?

• potassium

• sodium

• magnesium

• fluorine

Which of the following elements has / have a valency of two?

(I) Oxygen
(II) Calcium
(III) Helium

• I only

• II only

• I and II only

• I, II and III

What is the mass of water obtained?

• 18 g

• 36 g

• 72 g

• 144 g

What is the number of molecules in 16 g of ozone gas, O3?

• 0.33z

• 0.5z

• z

• 16z

Why is the pH of the water at the bottom of the lake likely to be higher than expected?

• calcium carbonate is an alkali

• calcium carbonate dissolves in water

• some of the acid formed may react with the carbonate rocks

• the concentration of hydrogen ions is higher than expected

Which compound is not used to prepare magnesium chloride by reaction with dilute hydrochloric acid?

• magnesium

• magnesium sulphate

• magnesium carbonate

• magnesium hydroxide

The diagram below shows a reaction scheme involving a metallic element G.
What could be the element G?

• Aluminium

• Calcium

• Lead

• Zinc

Which of the following reaction(s) produce(s) a colourless solution only?

 

(I)   iron(II) hydroxide and dilute sulphuric acid

(II)  aqueous calcium hydroxide and dilute hydrochloric acid

(III) sodium carbonate and dilute nitric acid

(IV) aqueous ammonium chloride and aqueous sodium hydroxide

• II only

• I and II only

• II and III only

• II and IV only