MCQ PRACTISE (EXERCISE 5)

The diagrams show four different methods of collecting gases.

Which method is suitable for collecting a gas which has the properties described?

• A

• B

• C

• D

After acidification with dilute nitric acid, a colourless solution of X reacts with aqueous silver nitrate to give a white precipitate.

What could X be?

• calcium iodide

• copper(II) chloride

• lead(II) iodide

• sodium chloride

The diagram represents a chromatogram of the colourless acids present in a drink. The chromatogram has been treated with a locating agent. A table of Rf values for the possible acids is given.
Which acids are present in the drink?

• citric acid, malic acid and lactic acid

• citric acid, malic acid and succinic acid

• malic acid, lactic acid and succinic acid

• tartaric acid, citric acid and malic acid

Which gas will diffuse at the fastest rate at the same temperature and pressure?

• Ar

• C₃H₈

• CO₂

• F₂

Two particles, K⁺ and Ar, can be written as ³⁹₁₉K⁺ and ⁴⁰₁₈Ar. Which statement about these particles is correct?

• Ar has more neutrons than K⁺

• K has more nucleons than Ar

• K⁺ has 20 electrons

• K⁺ has a greater mass than Ar

A mineral deposit is found to contain small grains made entirely of the element carbon.Which property will definitely be true of the grains of carbon?

• They will be made of atoms arranged in layers.

• They will be soft.

• They will burn to give carbon dioxide.

• They will conduct electricity.

Which diagram shows the outer electron arrangement in calcium fluoride?

• 
• 
• 
• 

How many shared pairs of electrons are there in one carbon dioxide molecule?

• 2

• 4

• 8

• 12

Two statements about metals are given. Which is correct?

• Both statements are correct and statement 1 explains statement 2.

• Both statements are correct but statement 1 does not explain statement 2.

• Statement 1 is correct and statement 2 is incorrect.

• Statement 2 is correct and statement 1 is incorrect.

Powdered calcium carbonate reacts with dilute hydrochloric acid to produce calcium chloride, water and carbon dioxide.What is the correct ionic equation, including state symbols, for this reaction?

• CaCO₃(s) + 2HCl (aq) → CaCl₂(aq) + H₂O(l) + CO₂(g)

• Ca²⁺(aq) + CO₃^2–(aq) + 2H⁺(aq) → Ca²⁺(aq) + H₂O(l) + CO₂(g)

• CO₃^2–(aq) + 2H⁺(aq) → H₂O(l) + CO₂(g)

• CaCO₃(s) + 2H⁺(aq) → Ca²⁺(aq) + H₂O(l) + CO₂(g)