Pick the odd one out?

To get purple coloured glass what metallic compound is used?

Antacids  are used to reduce

Soft drinks may contain many different acids .The acids that produce fizz or bubbles are

The plastic which is coated on the uniforms of firemen to make them fire-resistant is

The non-stick coating on frying pans is that of a plastic called

Which are used to kill bacteria that cause diseases and also to control their growth ?

Which is a thermoplastic?

Which plastic is used for making flexible water bottles?