Chemistry Mock 2026

Question 1 of 50

The atomic number of an element is the number of

Question 2 of 50

Which of the following is a noble gas?

Question 3 of 50

What is the relative molecular mass of H₂O? (H = 1, O = 16)

Question 4 of 50

Which of the following elements is an alkali metal?

Question 5 of 50

The halogens are found in Group

Question 6 of 50

Which of the following compounds is ionic?

Question 7 of 50

The bond formed when electrons are transferred from one atom to another is

Question 8 of 50

The number of neutrons in ²³Na (atomic number 11) is

Question 9 of 50

Elements in the same group of the periodic table have the same

Question 10 of 50

The bond in a chlorine molecule (Cl₂) is

Question 11 of 50

What is the molar mass of CaCO₃? (Ca = 40, C = 12, O = 16)

Question 12 of 50

How many moles are in 4 g of sodium hydroxide? (Na = 23, O = 16, H = 1)

Question 13 of 50

What volume does 2 moles of a gas occupy at s.t.p.? (Molar volume = 22.4 dm³)

Question 14 of 50

According to Boyle's law, at constant temperature the volume of a fixed mass of gas is

Question 15 of 50

In the equation N₂ + 3H₂ → 2NH₃, how many moles of hydrogen react with 2 moles of nitrogen?

Question 16 of 50

Which of these is an alkane?

Question 17 of 50

How many moles are in 11 g of carbon dioxide? (C = 12, O = 16)

Question 18 of 50

Across a period from left to right, atomic radius generally

Question 19 of 50

The electronic configuration 1s² 2s² 2p⁶ 3s¹ belongs to

Question 20 of 50

The unusually high boiling point of water compared with H₂S is due to

Question 21 of 50

The shape of a methane (CH₄) molecule is

Question 22 of 50

Find the concentration of a solution containing 0.5 mol of solute in 250 cm³ of solution.

Question 23 of 50

What is the oxidation number of manganese in KMnO₄?

Question 24 of 50

According to Le Chatelier's principle, increasing the pressure on N₂ + 3H₂ ⇌ 2NH₃ will

Question 25 of 50

The catalyst used in the Contact process for making sulphuric acid is

Question 26 of 50

A compound contains 80% carbon and 20% hydrogen by mass. What is its empirical formula? (C = 12, H = 1)

Question 27 of 50

How many times faster does hydrogen (Mr = 2) diffuse than oxygen (Mr = 32)?

Question 28 of 50

Hess's law states that the total enthalpy change of a reaction

Question 29 of 50

For N₂(g) + 3H₂(g) ⇌ 2NH₃(g), increasing the pressure shifts the equilibrium

Question 30 of 50

What is the pH of 0.01 mol/dm³ hydrochloric acid?

Question 31 of 50

Which oxide of a Period 3 element is amphoteric?

Question 32 of 50

A solution has a pOH of 4 at 25 °C. What is its pH?

Question 33 of 50

A solution of ammonium chloride in water is

Question 34 of 50

A solution of sodium carbonate in water is

Question 35 of 50

Which indicator suits a titration of a strong acid with a weak base?

Question 36 of 50

A salt formed from a strong acid and a weak base, such as NH₄Cl, gives a solution that is

Question 37 of 50

The electron configuration 1s² 2s² 2p⁶ 3s² 3p⁵ belongs to

Question 38 of 50

The first ionisation energy of magnesium is higher than that of sodium because magnesium has

Question 39 of 50

What volume of CO₂ at s.t.p. is produced when 10 g of CaCO₃ reacts completely with excess acid? (CaCO₃ = 100)

Question 40 of 50

In the reaction 2Fe³⁺ + Sn²⁺ → 2Fe²⁺ + Sn⁴⁺, the oxidising agent is

Question 41 of 50

During electrolysis of brine, the product at the anode is

Question 42 of 50

An element has isotopes of mass 63 (69%) and 65 (31%). Its relative atomic mass is about

Question 43 of 50

Which has the largest ionic radius?

Question 44 of 50

The bond angle in ammonia is about 107° because

Question 45 of 50

Which molecule is non-polar despite having polar bonds?

Question 46 of 50

The type of hybridisation of carbon in ethene is

Question 47 of 50

25.0 cm³ of 0.10 mol/dm³ NaOH neutralises 20.0 cm³ of HCl. The concentration of the acid is

Question 48 of 50

A gas occupies 300 cm³ at 27 °C and 1 atm. Its volume at 127 °C and 2 atm is

Question 49 of 50

The empirical formula of a compound with 40% C, 6.7% H and 53.3% O is

Question 50 of 50

What mass of oxygen is needed to burn 8 g of methane completely? (C = 12, H = 1, O = 16)