Human body is made up of elements:

Long form of periodic Table is constructed on the basis of:

How many number of mole are equivalent to 11 grams of CO₂:

It is used to cure sting of wasps

How many electrons can K-shell accommodate?

The valence of chromium is:

The compound which increase the weight of soap:

Atomic size of sodium atom is:

The mass of one molecule of water is:

Percentage by weight of hydrogen in ocean is:

______metal is brittle.

How many stable isotopes are present in carbon:

The radios of carbon atom is:

Transition elements are:

Small sized atoms have nuclear charge?

Atomic size of sodium atom is:

Atomic size of sodium atom is:

Which element is found in most abundance in the atmosphere?

Fats exists in

The excellent conductor of heat & electricity is:

Which one of the following metal burn with brick red flame in the air on heating

Which element has the least value of electronegativity

At room temperature, fluorine & chlorine exist as:

The sulpher dioxide is used to manufacture :

Wavelength of sunlight radiation is