Which statement about the alkali metals is correct? (TYS 2011/Q17)

• Their melting points decrease on descending the group.

• Their reactivities decrease on decreasing the group.

• They form oxides on reacting with water.

• They form covalent bonds with the halogens.

Using your knowledge of halogens, which statement is incorrect? (TYS 2015/Q27)

• Bromine displaces astatine from aqueous potassium astatide.

• Silver astatide is insoluble in dilute nitric acid.

• Hydrogen astatide is a covalent molecule.

• Solid astatine is white.

Which pairs of elements, when reacted together, would give the most violent reaction? (TYS 2017/Q23)

• caesium and fluorine

• lithium and iodine

• potassium and bromine

• sodium and chlorine

Elements X and Y are from Group VII of the Periodic Table.

X is a liquid at r.t.p. Y is a solid at r.t.p.

Which statements are correct?

(TYS 2008 Q26)

• Atoms of Y have more protons that atoms of X.

• Molecules of Y have more atoms than molecules of X.

• Y displaces X from aqueous solutions of X^- ions.

Which of the following displacement reactions has the correct state symbols? (modified 2015 P1/Q9a)

• F₂ (l) + 2KBr (aq) → Br₂ (aq) + 2KF (aq)

• F₂ (g) + 2KBr (aq) → Br₂ (aq) + 2KF (aq)

• F₂ (g) + 2KBr (aq) → Br₂ (l) + 2KF (aq)

• F₂ (l) + 2KBr (aq) → Br₂ (l) + 2KF (aq)

Excess chlorine gas can be tested with damp blue litmus paper and by bubbling the gas through potassium iodide solution.

What colour would the damp blue litmus paper and potassium iodide solution be at the end of the test with excess chlorine? (TYS 2012/Q25)

• litmus paper bleached, KI turns brown

• litmus paper bleached, KI turns colourless

• litmus paper turns red, KI turns brown

• litmus paper turns red, KI turns colourless

Which property of aluminium suggests it is not a transition metal?

• conducts electricity

• high melting point

• low density

• malleable

P, Q, R and S are elements in the Periodic Table.

• Q and R are formed as elements at the positive electrode during electrolysis.
• P and S both conduct electricity.
• P has a higher melting point than S.
• Q displaces R from aqueous solutions containing R^- ions. (TYS 2017/Q27)

• P could be Na and S could be Li.

• Q could be Br₂ and R could be I₂.

• R would be paler in colour than Q.

• S exists as diatomic molecules.

An J has its symbol written as ²₃J.

To which Group does element J belong?

• 0

• II

• III

• V

The elements W, X, Y and Z have increasing proton numbers. They are all in Period 3 of the Periodic Table but are not necessary next to each other.

Which statement is correct? (TYS 2014/Q20)

• The chloride of Z is ionic.

• The oxides of W and Z are both amphoteric.

• W and Y contain the same number of shells of electrons.

• X and Y could be in the same group in the Periodic Table.