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
Substance which alter the rate of chemical reaction is
oxidizing agent
catalyst
reducing agent
none of these
The most abundant element in the universe
Aluminium
Nitrogen
Carbon
Action of hydrogen on litmus is
acidic
neutral
basic
not predictable
Hydrogen is a
blue colour gas
pink colour gas
colourless
green colour gas
Reduction is the process of
removal of oxygen
removal of hydrogen
addition of oxygen
addition of carbon
Who invented 1st hydrogen balloon?
Jacques charles
Lavoiser
Robert Boyle
Rutherford
On Haber process, which of these gas is releasing?
Sodium choride
Ammonia
Methane
Zinc chloride
Complete the reaction
2Na + H2 → ?
2NaH
Na2H
NaH2
NaH
