Find the one which does not belong to that

The slow corrosion of iron in the presence of moist air is known as:

Which of the following metal have the highest Melting point?

What are the constituent metals of the alloy known as 'German Silver'?

Which chemical compound is used in the indelible ink for elections?

What is the chemical name of Baking Soda ? 

Which material is used as a moderator in a nuclear power plant that slows down the neutrons and makes them fit for causing fission?

Another name of Carborundum is

______is used to coat Galvanised Iron.

Which of the following is the best sources for Vitamin D are –

Gunpowder consists of a mixture of: