Group 7 - Halide reactions

What name is given to the halogen when it is both oxidised and reduced?

What is used to test for halide ions?

What colour is the precipitate produced when testing for chloride ions

• No ppt produced

• Cream ppt

• White

• Pale yellow ppt

What colour is the precipitate produced when testing for bromide ions

• No ppt produced

• Cream ppt

• White

• Pale yellow ppt

What colour is the precipitate produced when testing for fluoride ions

• No ppt produced

• Cream ppt

• White

• Pale yellow ppt

What colour is the precipitate produced when testing for iodide ions

• No ppt produced

• Cream ppt

• White

• Pale yellow ppt

In terms of electrons, state the meaning of the term oxidising agent

The boiling points of the halogens increase down Group VII because

• covalent bond strengths increase

• bond polarities increase

• the surface areas of the molecules increase

• electronegativities increase

An aqueous solution of a white solid gives a yellow precipitate with aqueous silver nitrate. The formula of the white solid could be

• AgBr

• AgI

• NaBr

• NaI