Chemistry Mock 2019

Question 1 of 50

Different forms of the same element in the same physical state are

Question 2 of 50

The functional group of the alkanoic acids is

Question 3 of 50

Farmers add lime to soil that is

Question 4 of 50

The pH of pure water at 25 °C is

Question 5 of 50

Antacid tablets relieve indigestion by

Question 6 of 50

Rusting of iron is an example of

Question 7 of 50

Transition metals often form

Question 8 of 50

Which is a transition element?

Question 9 of 50

Soap is made by boiling fats with

Question 10 of 50

The compound formed between magnesium and chlorine has the formula

Question 11 of 50

Zinc reacts with dilute hydrochloric acid to produce

Question 12 of 50

Simple molecular substances such as CO₂ have

Question 13 of 50

Ethanol is produced industrially by

Question 14 of 50

Cracking of long-chain alkanes produces

Question 15 of 50

A solution of ammonium chloride is slightly

Question 16 of 50

Hydrolysis of a salt is a reaction between the salt and

Question 17 of 50

In Zn + CuSO₄ → ZnSO₄ + Cu, zinc is

Question 18 of 50

A reducing agent

Question 19 of 50

The oxidation number of sulphur in H₂SO₄ is

Question 20 of 50

Transition metals have

Question 21 of 50

Iron is used as a catalyst in the

Question 22 of 50

Fats and oils are esters of glycerol and

Question 23 of 50

Oils are usually liquid at room temperature because they contain

Question 24 of 50

Hydrogenation of vegetable oils produces

Question 25 of 50

An element X has electron configuration 2, 8, 2. X belongs to

Question 26 of 50

The relative atomic mass of chlorine is 35.5 because

Question 27 of 50

The electron configuration of calcium (Z = 20) is

Question 28 of 50

Which pair are isotopes?

Question 29 of 50

How many shared pairs of electrons are in a nitrogen molecule, N₂?

Question 30 of 50

The shape of the water molecule is

Question 31 of 50

Which substance has a giant covalent structure?

Question 32 of 50

What mass of CaO is produced when 100 g of CaCO₃ decomposes completely? (Ca = 40, C = 12, O = 16)

Question 33 of 50

What volume of oxygen at s.t.p. is needed to burn 2 moles of hydrogen completely?

Question 34 of 50

At constant pressure, the volume of a gas is directly proportional to its

Question 35 of 50

A gas occupies 200 cm³ at 300 K. At constant pressure, its volume at 600 K is

Question 36 of 50

An ion X²⁻ has 18 electrons. The atomic number of X is

Question 37 of 50

Element Y has electron configuration 2, 8, 7. It forms ions with charge

Question 38 of 50

Down a group in the periodic table, atomic radius

Question 39 of 50

Across a period, first ionisation energy generally

Question 40 of 50

The number of electrons shared in a double covalent bond is

Question 41 of 50

The shape of the methane molecule is

Question 42 of 50

Hydrogen bonding explains the high boiling point of

Question 43 of 50

The number of moles in 8.8 g of CO₂ (C = 12, O = 16) is

Question 44 of 50

The volume of 0.5 mol of a gas at s.t.p. is

Question 45 of 50

The element with configuration 1s² 2s² 2p⁶ 3s² is in

Question 46 of 50

Which compound has the highest melting point?

Question 47 of 50

The H–O–H bond angle in water is about

Question 48 of 50

A dative bond is formed when

Question 49 of 50

What mass of NaCl is needed to make 250 cm³ of 0.2 mol/dm³ solution? (NaCl = 58.5)

Question 50 of 50

A gas has a density of 1.43 g/dm³ at s.t.p. Its molar mass is about