IGCSE Chemistry (Double) - Topic 2: Inorganic Chemistry

Front

Which element is in Group 1 of the periodic table?

Back

Sodium

Answer explanation

Sodium is the only element listed that belongs to Group 1 of the periodic table, which contains alkali metals. Magnesium (Group 2), Fluorine (Group 17), and Aluminium (Group 13) are not in Group 1.

Front

What is a characteristic property of noble gases?

Back

Complete outer electron shells

Answer explanation

Noble gases have complete outer electron shells, making them stable and unreactive. This characteristic property distinguishes them from other elements, which often seek to gain or lose electrons to achieve stability.

Front

What is the trend in reactivity in Group 1?

Back

Increases down the group

Answer explanation

In Group 1, reactivity increases down the group due to the increasing atomic size and decreasing ionization energy, making it easier for the elements to lose their outermost electron.

Front

Why do noble gases have low reactivity?

Back

They have full outer shells

Answer explanation

Noble gases have full outer shells of electrons, making them stable and unreactive. This stability is the reason they do not readily form chemical bonds with other elements.

Front

Which of the following is a halogen? Potassium, Bromine, Argon, Calcium

Back

Bromine

Answer explanation

Bromine is a halogen, found in Group 17 of the periodic table. Potassium and calcium are alkali and alkaline earth metals, respectively, while argon is a noble gas. Thus, bromine is the correct answer.

Front

What happens when lithium reacts with water?

Back

It floats and fizzes, producing hydrogen gas

Answer explanation

When lithium reacts with water, it floats on the surface and fizzes as it produces hydrogen gas. This reaction is not explosive but can be vigorous, making the correct choice 'It floats and fizzes, producing hydrogen gas'.

Front

Which statement about halogens is correct?

Back

Their reactivity decreases down the group

Answer explanation

The correct statement is that reactivity decreases down the group. As you move from fluorine to iodine, the ability to gain electrons decreases, making the elements less reactive.

Front

What is observed when chlorine is bubbled through potassium iodide solution?

Back

A brown colour appears

Answer explanation

When chlorine is bubbled through potassium iodide solution, it oxidizes iodide ions to iodine, resulting in a brown color due to the formation of iodine in the solution.

Front

Which property is typical of metals?

Back

High melting points

Answer explanation

Metals are typically characterized by high melting points due to strong metallic bonds. In contrast, they are not brittle, have good electrical conductivity, and are usually shiny, not dull.

Front

Property of transition metals? Options: They have low densities, They form coloured compounds, They are highly reactive with water, They do not form alloys

Back

They form coloured compounds

Answer explanation

Transition metals are known for forming coloured compounds due to the presence of partially filled d-orbitals, which allow for electron transitions that absorb visible light. This property distinguishes them from many other elements.