Solutions

What happens when a more reactive element meets a less reactive one in a compound?

• The less reactive element becomes more reactive.

• Nothing happens.

• They both become less reactive.

• The more reactive element displaces the less reactive one.

Why is it useful to displace less reactive metals like silver?

• Because they are easy to find.

• Because they are not useful.

• Because they are precious and valuable.

• Because they are more reactive.

What happens when bromine is added to sodium iodide solution?

• The solution remains colorless.

• The solution turns green.

• The solution turns dark brown.

• The solution turns blue.

In the thermite reaction, what does aluminum do to iron oxide?

• It displaces the iron from its oxide.

• It turns into iron.

• It does nothing.

• It combines with it.

Why is the thermite reaction important for railway tracks?

• It helps in painting the tracks.

• It is used to fuse and repair tracks.

• It is used to clean the tracks.

• It makes the tracks shiny.