Chemistry Interview Question:

Which of the following is NOT true of helium?

Submitted by: Administrator

1. deep sea divers breath a mixture of helium and oxygen
2. breathing helium causes a temporary change in the pitch and quality of one's voice
3. helium gas is commonly used by dentists as a mild anesthetic
4. a mixture of helium and neon gas produced the first gas laser

Answer: C
Submitted by: Administrator