Methane contributes towards global warming so it is called a _________________ gas.

 

Washing soda is used ______.

I. for removing permanent hardness of water

II. for disinfecting drinking water

III. as a cleaning agent for domestic purpose

Elements having same atomic numbers but different mass number are called ______.

An electron loses potential energy when it

Lime water becomes white due to which gas?

What is the position of metallic ion and non-metallic ion in a chemical formula?

____ is the most electropositive and ___ is the most electronegative element of the third period of modern periodic table.

____ are atoms/molecules/ions containing the same number of electrons.

___ is used to control the fission reaction rate in a nuclear reactor as it absorbs neutrons without itself getting into fissioning.