The  chemical known as thimerosal has been used to preserve saline solutions and vaccines .Thimerosal contains which metal ?

Which is a thermoplastic?

Pick the odd one out.

To get purple coloured glass what metallic compound is used?

To control the setting time , which is added to the cement?

Antacids  are used to reduce

Pick the odd one out?

Chocolate and Cocoa naturally contain relatively high levels of which two metals ? 

Which are used to control germs without causing damages to bodycells?

Which plastic is used for making flexible water bottles?