Chemistry Mock 2021

Question 1 of 50

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

Question 2 of 50

The bond formed by sharing a pair of electrons is

Question 3 of 50

The molar mass of CO2 (C = 12, O = 16) is

Question 4 of 50

How many moles are in 9 g of water (H2O = 18 g/mol)?

Question 5 of 50

The number of particles in one mole of a substance is about

Question 6 of 50

An acid reacts with a carbonate to give a salt, water and

Question 7 of 50

Oxidation can be defined as

Question 8 of 50

A solution with pH 12 is

Question 9 of 50

The general formula of the alkanes is

Question 10 of 50

The functional group of the alkanols is

Question 11 of 50

The number of protons in an atom is its

Question 12 of 50

The volume occupied by 1 mole of a gas at s.t.p. is

Question 13 of 50

In 2H₂ + O₂ → 2H₂O, the mole ratio of H₂ to O₂ is

Question 14 of 50

The formula of calcium carbonate is

Question 15 of 50

The direct change from solid to gas is

Question 16 of 50

According to the kinetic theory, raising the temperature of a gas

Question 17 of 50

Sodium chloride conducts electricity when

Question 18 of 50

The shape of a methane molecule is

Question 19 of 50

At constant temperature, doubling the pressure of a fixed mass of gas makes its volume

Question 20 of 50

A catalyst increases the rate of reaction by

Question 21 of 50

In an exothermic reaction, ΔH is

Question 22 of 50

Ethene decolourises bromine water because it

Question 23 of 50

Ethanoic acid reacts with ethanol in the presence of concentrated H2SO4 to form

Question 24 of 50

25 cm³ of 0.1 mol/dm³ NaOH is neutralised by 0.1 mol/dm³ HCl. The volume of acid needed is

Question 25 of 50

Poly(ethene) is made by

Question 26 of 50

Nylon is an example of a

Question 27 of 50

Dalton's atomic theory stated that atoms

Question 28 of 50

The scientist who discovered the electron was

Question 29 of 50

The neutron was discovered by

Question 30 of 50

How many moles are in 20 g of NaOH (Na = 23, O = 16, H = 1)?

Question 31 of 50

The mass of 2 moles of oxygen molecules (O = 16) is

Question 32 of 50

The number of atoms in 0.5 mol of carbon is

Question 33 of 50

The empirical formula of C₆H₁₂O₆ is

Question 34 of 50

Balance: N₂ + H₂ → NH₃. The coefficients are

Question 35 of 50

Brownian motion is evidence that

Question 36 of 50

In the Haber process, typical conditions are about

Question 37 of 50

The number of moles of oxygen atoms in 0.5 mol of CuSO₄ is

Question 38 of 50

Balance: C₃H₈ + O₂ → CO₂ + H₂O. The coefficient of O₂ is

Question 39 of 50

In the electrolysis of copper(II) sulphate with copper electrodes, the anode

Question 40 of 50

For H₂(g) + I₂(g) ⇌ 2HI(g), Kc = 49 at a temperature. Kc for 2HI ⇌ H₂ + I₂ is

Question 41 of 50

If 0.2 mol each of H₂ and I₂ are in equilibrium with 1.4 mol HI in 1 dm³, Kc is

Question 42 of 50

How many structural isomers does C₄H₉OH (alkanols) have?

Question 43 of 50

A tertiary alcohol is

Question 44 of 50

Benzene undergoes mainly substitution rather than addition because

Question 45 of 50

In the Solvay process, the main product is

Question 46 of 50

What volume at s.t.p. is occupied by 8.8 g of CO₂? (C = 12, O = 16)

Question 47 of 50

The mass of 3.01 × 10²³ molecules of NH₃ (N = 14, H = 1) is

Question 48 of 50

A hydrated salt CuSO₄·xH₂O loses 36% of its mass on heating. Find x (CuSO₄ = 160, H₂O = 18).

Question 49 of 50

Real gases deviate most from ideal behaviour at

Question 50 of 50

The second ionisation energy of sodium is very high because