A greenish yellow poisonous gas is
Gold, silver, copper and aluminum are
A chemical reaction can be explained and presented in form of
A process by which new substance is formed, is called
Salt, sugar, chalk and sand are all
A molecule which breaks and gives of hydrogen and oxygen is
Process which involves in breaking down element by passing electricity through it is called
When iron and sulphur are mixed together at room temperature there is lack of
Heating, exposing to light or passing electricity will only let to decompose
A substance which consists of two or more elements which have been combined chemically is called
Person who first arranged elements in form of periodic table was
Elements resting in same group share same
Water is broken down into small units by passing it through