Unit 7 The P Block Elements (Intext Questions-15)
Intext Questions
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.Show Answer
Answer Balanced equation $\mathrm{XeF_6}+2 \mathrm{H_2} \mathrm{O} \rightarrow \mathrm{XeO_2} \mathrm{~F_2}+4 \mathrm{HF}$Show Answer
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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 $\mathrm{RnF_2}$ have not been isolated. They have only been identified.
