CAIE A-Level Chemistry AS 9.2 Periodicity of Chemical Properties of the Elements in Period 3 Questions

Aluminium, silicon and phosphorus are elements in Period 3 of the Periodic Table. Each element forms an oxide.

Which row is correct?

In reactions 1 and 2, X represents an element in Period 3.
In each reaction, X is forming a product where X is in its highest oxidation state.

reaction 1 chlorine + element $\mathrm{X} \rightarrow \mathrm{X}_{\mathrm{y}} \mathrm{Cl}_{\mathrm{z}}$

reaction 2 oxygen + element $X \rightarrow X_{p} O_{q}$

Which ratios show a steady increase from sodium to phosphorus?

Element X is in Period 3. Element X reacts with oxygen to produce a solid, Y.
When solid Y is added to water, a solution with a pH of less than 7 is produced.
What is the identity of element X ?

Magnesium, aluminium and silicon are elements in the Periodic Table. Each element forms an oxide.

Which row is correct?

Elements Y and Z are both in Period 3 of the Periodic Table.
When the chloride of element Y is added to water, it reacts and a solution of pH 2 is produced.
When the chloride of element Z is added to water, it dissolves and a solution of pH 7 is produced.
Which statement explains these observations?

The elements magnesium and phosphorus are reacted separately with an excess of oxygen to form their oxides. Each oxide is then added separately to water and the pH values of the resulting solutions are measured.

The same two elements are reacted separately with an excess of chlorine to form their chlorides. Each chloride is then added separately to water and the pH values of the resulting solutions are measured.

Which row is correct?

Element X is in Period 3. It reacts rapidly with water to form an alkaline solution.
Which statement about the chloride of element X is correct?