Chemistry Mock 2025

Question 1 of 50

The pH of a neutral solution at 25 °C is

Question 2 of 50

A reaction that gives out heat to the surroundings is

Question 3 of 50

The functional group of the alkanols (alcohols) is

Question 4 of 50

Ethanol is produced from sugar by

Question 5 of 50

The Haber process is used to manufacture

Question 6 of 50

Which indicator is pink in alkaline solution and colourless in acid?

Question 7 of 50

Oxidation is defined as

Question 8 of 50

In electrolysis, the electrode at which oxidation occurs is the

Question 9 of 50

Which of the following will NOT increase the rate of a reaction?

Question 10 of 50

The general formula of the alkenes is

Question 11 of 50

Bromine water is decolourised by

Question 12 of 50

The reaction between an alkanoic acid and an alkanol to form a sweet-smelling compound is

Question 13 of 50

Soap is made by boiling fats or oils with

Question 14 of 50

Polythene (polyethene) is formed by

Question 15 of 50

Hard water contains dissolved

Question 16 of 50

20.0 cm³ of 0.10 mol/dm³ HCl neutralises 25.0 cm³ of NaOH solution. What is the concentration of the NaOH?

Question 17 of 50

What is the oxidation number of sulphur in H₂SO₄?

Question 18 of 50

Which transition-metal compound is the catalyst in the Contact process for sulphuric acid?

Question 19 of 50

Nylon is a condensation polymer because, as it forms,

Question 20 of 50

Which sub-level is filled after 3p?

Question 21 of 50

The shape of a water molecule is

Question 22 of 50

Find the percentage of nitrogen in NH₄NO₃. (N = 14, H = 1, O = 16)

Question 23 of 50

In the reaction Zn + Cu²⁺ → Zn²⁺ + Cu, the oxidising agent is

Question 24 of 50

For 2SO₂ + O₂ ⇌ 2SO₃ (exothermic), raising the temperature shifts the equilibrium

Question 25 of 50

The oxidation number of Mn in KMnO4 is

Question 26 of 50

For N2 + 3H2 ⇌ 2NH3, increasing the pressure shifts the equilibrium to the

Question 27 of 50

The indicator best for titrating a strong acid with a weak base is

Question 28 of 50

Ice floats on water because hydrogen bonding in ice

Question 29 of 50

For an exothermic forward reaction, increasing the temperature shifts the equilibrium

Question 30 of 50

An acid salt contains

Question 31 of 50

The pH of a 0.01 mol/dm³ HCl solution is

Question 32 of 50

Which salt solution would turn red litmus blue?

Question 33 of 50

Which is the best oxidising agent?

Question 34 of 50

The Contact process uses which catalyst?

Question 35 of 50

The concentration of a solution with 4 g of NaOH in 500 cm³ is

Question 36 of 50

How many faradays are needed to deposit 1 mol of copper from Cu²⁺ ions?

Question 37 of 50

The oxidation number of nitrogen in NH₄⁺ is

Question 38 of 50

A reaction rate doubles for every 10 °C rise. Raising the temperature by 30 °C increases the rate by a factor of

Question 39 of 50

Ethanol is oxidised by acidified K₂Cr₂O₇ to

Question 40 of 50

The reaction of ethene with steam in the presence of H₃PO₄ produces

Question 41 of 50

In the Contact process, SO₂ is oxidised to SO₃ using

Question 42 of 50

Permanent hardness of water is caused by dissolved

Question 43 of 50

In the extraction of iron, limestone is added to the blast furnace to

Question 44 of 50

The maximum number of electrons in the n = 3 shell is

Question 45 of 50

For 2SO₂ + O₂ ⇌ 2SO₃ (ΔH negative), the yield of SO₃ is increased by

Question 46 of 50

Using bond energies C–H 413, O=O 498, C=O 805, O–H 464 kJ/mol, ΔH for CH₄ + 2O₂ → CO₂ + 2H₂O is about

Question 47 of 50

The IUPAC name of CH₃CH(CH₃)CH₂CH₃ is

Question 48 of 50

Which compound exhibits cis–trans isomerism?

Question 49 of 50

The number of isomers of C₅H₁₂ is

Question 50 of 50

The quantum number that describes the shape of an orbital is the