A. Oxygen
B. Hydrogen
C. Carbon
D. None of these

A. Hydrogen and Nickel Catalyst
B. Hydrogen and CO2
C. Hydrogen and O2
D. None of these

A. Hydrogen
B. CO2
C. O2
D. Nitrogen

A. Nitrous oxide N2O
B. CO2
C. NH3
D. O2

A. Marie Curie
B. Alexander Fleming
C. Pasture
D. None of the above

A. Silver
B. Iron
C. Gold
D. None of the above

A. Purity of water
B. Archimedes principal
C. Newton’s second law of motion
D. None of these

A. Positive
B. Negative
C. Both a+b
D. None

A. 1 Hydrogen and 1 oxygen atom
B. 2 Hydrogen and 1 oxygen atom
C. 2 Hydrogen and 2 oxygen atoms
D. None of the above

A. Alpha
B. Gamma
C. lionized Particles
D. None of the above