Which of these is not used for the preparation of hydrogen?
Na
O
K
Pb
Who invented 1st hydrogen balloon?
Jacques charles
Lavoiser
Robert Boyle
Rutherford
Valency of hydrogen is
3
2
1
5
The hydrogen gas is how many times lighter than air?
1000
100
10
20
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
Complete the reaction
2Na + H2 → ?
2NaH
Na2H
NaH2
NaH
Hydrogen occurs in combined state in earth as
Water
Coal petroleum
Carbohydrates, proteins
All of these
On Haber process, which of these gas is releasing?
Sodium choride
Ammonia
Methane
Zinc chloride
Which of the following is the lightest known element?
Hydrogen
Helium
Lithium
Neon
