MCQ-4: Summer 2022

Which gas has the fastest rate of diffusion?

In which state does 1 dm³ of methane contain the most particles?

Which statement explains why isotopes of the same element have the same chemical properties?

The electronic structures of atoms P and Q are shown.

P and Q form an ionic compound.
What is the formula of the compound?

Fermentation of sugar produces a mixture of ethanol solution and solid yeast.
How is the solid yeast removed from the mixture?

Which row explains why copper is a good conductor of electricity at room temperature?

Which pair of statements about diamond and graphite is correct?

Sodium nitride contains the nitride ion, N^3–.
Sodium nitride is unstable and decomposes into its elements.
What is the equation for the decomposition of sodium nitride?

Compound X contains carbon, hydrogen and oxygen only.
By mass, it contains 26.7% carbon and 2.2% hydrogen.
What is the empirical formula of X?

Caesium fluoride is an ionic compound.
Which statements about caesium fluoride are correct?

1. It conducts electricity when solid.
2. It has a high melting point.
3. It is soluble in water.
4. It is highly volatile.

Which diagram shows the direction of movement of ions and electrons during the electrolysis of molten sodium chloride?

Calcium carbonate, CaCO3, reacts with dilute hydrochloric acid to produce carbon dioxide.
The equation for the reaction is shown. The relative formula mass of calcium carbonate is 100.
CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂
10 g of calcium carbonate is reacted with an excess of dilute hydrochloric acid.
Which mass of carbon dioxide is produced?

Molten sodium chloride and concentrated aqueous sodium chloride are electrolysed using platinum electrodes.
What are the products at the negative electrode (cathode) in each electrolysis?

An object is electroplated with silver using an aqueous silver salt as the electrolyte.
Which row is correct?

Which row describes the changes that occur in an endothermic reaction?

Which statement about fuels is correct?

Which statement about endothermic and exothermic reactions is correct?

The reaction used to manufacture ammonia from nitrogen and hydrogen is reversible.
An equilibrium is established between ammonia, nitrogen and hydrogen.
Which statement describes the equilibrium?

How does increasing the concentration affect the reacting particles in a chemical reaction?

Methyl orange is added to dilute hydrochloric acid and to aqueous sodium hydroxide.
What is the colour of the methyl orange in each solution?

Zinc oxide is an amphoteric oxide.
Which types of substances will react with zinc oxide?

Information about some silver compounds is shown.

Which equation shows a reaction which cannot be used to make a silver salt?

Aqueous ethanoic acid is a weak acid.
Aqueous sodium hydroxide is a strong base.
Aqueous ethanoic acid is neutralised by aqueous sodium hydroxide.
Which statements are correct?

1. Aqueous ethanoic acid accepts protons from hydroxide ions.
2. The aqueous ethanoic acid used is fully dissociated into ions.
3. The aqueous sodium hydroxide used is fully dissociated into ions.
4. The reaction produces a salt and water.

Three properties of element X are listed.

• It contains atoms with a full outer shell of electrons.
• It is monoatomic.
• It is unreactive.

In which part of the Periodic Table is the element placed?

Which word equation represents a reaction that occurs?

Which statement about the extraction of aluminium is correct?

Metal M is mixed with copper to produce brass.
What is M?

The table gives some properties of an element.

Which other property does this element have?

Ammonia is produced using the Haber process.
Which row shows the source of the raw materials and the reaction conditions?

How many species are acting as bases in this reversible reaction?
HNO₃ + H₂O ⇋ H₃O⁺ + NO₃^–

The equation for a reaction occurring in the Contact process is shown.
2SO₂ + O₂ → 2SO₃
What is the catalyst used in this reaction?

Which information about carbon dioxide and methane is correct?

key
✔ = correct
✘ = not correct

The structure of an ester is shown.

What are the names of the carboxylic acid and the alcohol that react together to form this ester?

Which statements about lime are correct?

1. Lime is made by heating calcium carbonate (limestone).
2. Lime is used to desulfurise flue gases.
3. Lime is used to treat alkaline soil.
4. The chemical name for lime is calcium oxide.

Which structure is correctly named?

The structure of part of a polymer is shown.

Which monomers can be used to make this polymer?

Carboxylic acids are made by the oxidation of alcohols.
Which carboxylic acid is produced from CH₃CH₂OH?

Propene, C₃H₆, reacts with bromine, Br₂, in an addition reaction.
Which structure represents the product of this reaction?

Which statements about ethanol are correct?

1. Ethanol is used as a solvent.
2. Ethanol can be made directly from ethane.
3. Ethanol is a covalent compound.

Which diagram represents the structure of nylon?