U, V and W represent different halogens. The table shows the results of nine experiments in which aqueous solutions of , and were separately added to separate aqueous solutions containing , and ions.
| no reaction | no reaction | no reaction | |
| formed | no reaction | formed | |
| formed | no reaction | no reaction |
Which row contains the ions , and in order of their decreasing strength as reducing agents?
Options
| strongest weakest | |||
|---|---|---|---|
| A | |||
| B | |||
| C | |||
| D |
Which graph correctly describes a trend found in Group 17?
[X represents a halogen atom.]
Options
Three statements about the halogens, chlorine, bromine and iodine and their compounds are listed.
- The halogen with the highest boiling point has atoms which form the strongest bond to hydrogen.
- The halogen with the strongest instantaneous dipole (id–id) attractions forms the most thermally stable hydrogen halide.
- The most volatile element most rapidly oxidises hydrogen.
Which statements are correct?
Options
A 1 and 2
B 1 only
C 2 and 3
D 3 only
Which reagent or reagents and conditions will oxidise chlorine, , into a compound containing chlorine in the +5 oxidation state?
Options
A followed by at room temperature
B concentrated at room temperature
C cold dilute
D hot concentrated
Why do the halogens become less volatile as Group 17 is descended?
Options
A The halogen–halogen bond energy decreases.
B The halogen–halogen bond energy increases.
C The number of electrons in each molecule increases.
D The van der Waals’ forces between molecules become weaker.
Sodium bromide is warmed with concentrated sulfuric acid.
Which row describes the change in the oxidation number of the sulfur and the role of the bromide ions in the reaction?
Options
| change in oxidation number of sulfur | role of bromide ions | |
|---|---|---|
| A | +6 to +4 | oxidising agent |
| B | +6 to +4 | reducing agent |
| C | +4 to 0 | oxidising agent |
| D | +4 to 0 | reducing agent |
Mixing aqueous silver nitrate and aqueous sodium chloride produces a precipitate.
Addition of which reagent to the mixture gives a colourless solution?
Options
A aqueous ammonia
B aqueous potassium iodide
C dilute hydrochloric acid
D dilute nitric acid
Which statement about the properties of halogens and hydrogen halides is correct?
Options
A A chloride ion is a stronger reducing agent than an iodide ion.
B Chlorine is more volatile than bromine because chlorine has stronger intermolecular forces.
C Hydrogen bromide is more thermally stable than hydrogen iodide because it has a stronger covalent bond.
D Iodine is less reactive than bromine because iodine has weaker covalent bonds.
Which row is correct?
Options
| property | explanation | |
|---|---|---|
| A | AgI dissolves in aqueous ammonia more readily than AgCl does | AgI reacts with aqueous ammonia |
| B | HCl decomposes more readily than HI does | Cl is more electronegative than I |
| C | I₂ has a higher melting point than Cl₂ | I₂ has stronger van der Waals' forces than Cl₂ |
| D | I₂ is a stronger oxidising agent than Cl₂ | an I atom loses electrons more readily than a Cl atom |
Which anions are formed when chlorine is passed into cold aqueous potassium hydroxide?
Options
A Cl⁻ and ClO⁻
B Cl⁻ and ClO₃⁻
C Cl⁻ and ClO₄⁻
D ClO⁻ and ClO₃⁻