Reduction is the process of
removal of oxygen
removal of hydrogen
addition of oxygen
addition of carbon
Which of the following is the lightest known element?
Hydrogen
Helium
Lithium
Neon
Hydrogen occurs in combined state in earth as
Water
Coal petroleum
Carbohydrates, proteins
All of these
Action of hydrogen on litmus is
acidic
neutral
basic
not predictable
Which of these is not used for the preparation of hydrogen?
Na
O
K
Pb
Complete the reaction2H2 + O2 → ?
2HO + heat
H2O + heat
2H2O + heat
HO2 + heat
The most abundant element in the universe
Aluminium
Nitrogen
Carbon
Complete the reaction
2Na + H2 → ?
2NaH
Na2H
NaH2
NaH
Who invented 1st hydrogen balloon?
Jacques charles
Lavoiser
Robert Boyle
Rutherford
Oxidation is the process of
addition of O3
