How much estimated mass of universe is consisting of Hydrogen?
a) 30%
b) 40%
c) 10%
d) 75%
In which of the following, Hydrogen is used?
a) fertilizers
b) rocket fuels
c) processing industries
d) all of these
Which of the following is lighter gas and is used in weather balloons?
a) Hydrogen
b) Oxygen
c) Nitrogen
d) carbon
Nitrogen:
Nitrogen is the chemical element with the symbol N and atomic number 7. Nitrogen is a nonmetal and the lightest member of group 15 of the periodic table, often called the pnictogens.
How much
percentage of the atmosphere consists of Nitrogen?
a) 30%
b) 40%
c) 21%
d) 78%
Which of the following is/are characteristic/s of Nitrogen?
a) it is colorless gas
b) it is odorless gas
c) it lighter than air
d) all of these
