Which property of hydrogen is used for the extraction of metals?
oxidising property
reducing property
physical property
none of these
Oxidation is the process of
addition of oxygen
removal of oxygen
addition of O3
addition of carbon
Hydrogen is a
blue colour gas
pink colour gas
colourless
green colour gas
Who invented 1st hydrogen balloon?
Jacques charles
Lavoiser
Robert Boyle
Rutherford
Atomic number of hydrogen is
1
2
4
6
Complete the reaction2H2 + O2 → ?
2HO + heat
H2O + heat
2H2O + heat
HO2 + heat
Valency of hydrogen is
3
5
Which of the following reactions is /are the preparation of Hydrogen?
Reaction of Potassium with cold water
Reaction of magnesium with boiling water
Reaction of Iron with steam
All of these
The most abundant element in the universe
Aluminium
Nitrogen
Carbon
Hydrogen
Substance which alter the rate of chemical reaction is
oxidizing agent
catalyst
reducing agent
