The gas which is known as the laughing gas
The element which is present in all acids:
The nutrient which is not present in egg:
The only organ of a human being that regenerate:
According to WHO the minimum water needs for a person in a day
The dark spots on the surface of the sun appear dark because:
Burning of coal mainly produces:
The rarest element on earth:
The volatile elements like sodium, mercury etc are the elements with
Nanotechnology is the science of:
If the colour red and green mixed together we will get the colour:
The person behind the invention of electrons:
Which chemical compound is commonly known as 'washing soda'?
What is the name of the instrument used to measure blood pressure?
How many genes are present in the human genome?