Hydrogen occurs in combined state in earth as
Water
Coal petroleum
Carbohydrates, proteins
All of these
Hydrogen is a
blue colour gas
pink colour gas
colourless
green colour gas
Action of hydrogen on litmus is
acidic
neutral
basic
not predictable
Valency of hydrogen is
3
2
1
5
Substance which alter the rate of chemical reaction is
oxidizing agent
catalyst
reducing agent
none of these
The hydrogen gas is how many times lighter than air?
1000
100
10
20
Complete the reaction2H2 + O2 → ?
2HO + heat
H2O + heat
2H2O + heat
HO2 + heat
Oxidation is the process of
addition of oxygen
removal of oxygen
addition of O3
addition of carbon
Who invented 1st hydrogen balloon?
Jacques charles
Lavoiser
Robert Boyle
Rutherford
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
