The atomic weight of helium is 4 times that of hydrogen. Its diffusion rate as compared to hydrogen will be _____________ times?

A. Increases
B. Decreases
C. Remains unchanged
D. Increases exponentially

A. Heat of vaporisation
B. Melting point
C. Heat of fusion
D. Both B. and C.

A. Reduced by the addition of acid oxides
B. Increased by the addition of acid oxides
C. Not affected by the addition of acid oxides
D. Always less than 1000°C

A. Carbonate (monohydrate)
B. Chloride
C. Thiosulphate
D. Bisulphite

A. 1
B. 10
C. 100
D. 1000

A. Saturated
B. Supersaturated
C. Superheated
D. None of these