Chemistry 0620 · IGCSE · Noble gases

Noble gases — practice question

Why are weather balloons occasionally filled with helium instead of hydrogen?

  • AHelium is found in air.
  • BHelium is less dense than hydrogen.
  • CHelium is more dense than hydrogen.
  • DHelium is unreactive.

Worked solution & mark scheme

This 1-mark question has a full step-by-step worked solution and mark scheme.

  • Full mark scheme, point by point
  • Step-by-step worked solution
  • Write your answer & get it marked instantly by AI