Page No 205: - Chapter 7 - P - Block Elements - Intext Solutions - Ncert Solutions class 12 - Chemistry

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Question 7.32:

Why is helium used in diving apparatus?

Answer:

Air contains a large amount of nitrogen and the solubility of gases in liquids increases with increase in pressure. When sea divers dive deep into the sea, large amount of nitrogen dissolves in their blood. When they come back to the surface, solubility of nitrogen decreases and it separates from the blood and forms small air bubbles. This leads to a dangerous medical condition called bends. Therefore, air in oxygen cylinders used for diving is diluted with helium gas. This is done as He is sparingly less soluble in blood.

Question 7.33:

Balance the following equation: XeF₆ + H₂O → XeO₂F₂ + HF

Answer:

Balanced equation

XeF₆ + 2 H₂O → XeO₂F₂ + 4 HF

Question 7.34:

Why has it been difficult to study the chemistry of radon?

Answer:

It is difficult to study the chemistry of radon because it is a radioactive substance having a half-life of only 3.82 days. Also, compounds of radon such as RnF₂ have not been isolated. They have only been identified.