Group 7 gcse wjec

What is the position of the halogens in the periodic table?

• First column

• Second column from the right

• Middle column

• Last column

Answer explanation

The halogens are located in the second column from the right in the periodic table.

Which of the following is NOT a common property of the halogens chlorine, bromine, and iodine?

• Toxic – kills bacteria

• Forms salts with metals

• Conducts electricity

• Appears in gaseous form at room temperature

Answer explanation

The correct choice is 'Conducts electricity' because halogens like chlorine, bromine, and iodine are poor conductors of electricity.

What is the typical use of chlorine among the halogens?

• Antiseptic used during hospital procedures

• Sterilising water

• Not required

• Used in photographic film

Answer explanation

Chlorine is typically used for sterilising water among the halogens, making it the correct choice.

What happens to iodine when it is warmed?

• It dissolves in water

• It forms a purple vapor

• It becomes a liquid

• It becomes non-toxic

Answer explanation

When iodine is warmed, it forms a purple vapor, indicating a phase change from solid to gas.

What is the state of fluorine at room temperature?

• Solid

• Liquid

• Gas

• Plasma

Answer explanation

Fluorine is in a gaseous state at room temperature, making the correct answer choice Gas.

Which halogen has the lowest melting and boiling points?

• Chlorine

• Bromine

• Iodine

• Fluorine

Answer explanation

Fluorine has the lowest melting and boiling points among the halogens, making it the correct choice.

As you go down the group of halogens, how do their melting and boiling points change?

• They decrease

• They increase

• They remain constant

• They fluctuate

Answer explanation

As you go down the group of halogens, their melting and boiling points increase due to the increase in the size of the atoms.

What is the physical state of bromine at room temperature?

• Gas

• Liquid

• Solid

• Plasma

Answer explanation

Bromine is in a liquid state at room temperature, making it the correct choice among the options provided.

Refer to the diagram below to answer: Which halogen is represented as being in a solid state at the highest temperature on the graph?

• Iodine

• Astatine

• Bromine

• Chlorine

Answer explanation

Astatine is represented as being in a solid state at the highest temperature on the graph, making it the correct choice.

Which halogen is described as the most reactive in Group 7 of the periodic table?

• Chlorine

• Bromine

• Iodine

• Fluorine

Answer explanation

Fluorine is the most reactive halogen in Group 7 of the periodic table, making it the correct choice.