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Proton
Neutron
Proton and Neutron
Electron, Proton and Neutron
Number of neutrons in an atom of hydrogen is
Nylon is a type of
Nylon is made up of :
Nylon threads are made of
Of the following which one pollutes the air of a big city ?
Of the following, which element is common to all acids
One of the constituents of tear gas is
One of the following is used to dissolve noble metals. That is
One property of ammonia is
Ordinary table salt is sodium chloride. What is baking soda?