Question

Helium is added to oxygen used by deep sea divers because :

• A. It is less soluble in blood than nitrogen under high pressure
• B. It is lighter than nitrogen
• C. It is readily miscible with oxygen
• D. It is less poisonous than nitrogen

Answer 1

Answer: (A)

It is less soluble in blood than nitrogen under high pressure

Answer 2

6 XeF4 + 12 H2O $\longrightarrow$4 Xe + 2XeO3 + 24 HF + 3O2

CaCN2 + 3H2O $\longrightarrow$CaCO3 + 2NH3.