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प्रश्न
Account for the following:
Helium is used in diving apparatus.
Give reasons for the following :
Helium is used in diving apparatus as a diluent for oxygen.
उत्तर १
Helium mixed with oxygen under pressure is given to sea-divers for respiration. Air is not given to sea-divers because nitrogen present in air being soluble in blood will give a painful sensation called bends by bubbling out blood on moving from high pressure(in deep sea) to the atmospheric pressure.
उत्तर २
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.
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संबंधित प्रश्न
Draw the structures of the following molecules: XeF4
Draw the structures of the following molecules: XeF2
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Complete the equation : XeF2+PF5 →
Write the structures of the following molecules: XeOF4
Why has it been difficult to study the chemistry of radon?
How are xenon fluorides XeF2, XeF4 and XeF6 obtained?
Which one of the following does not exist?
(i) XeOF4
(ii) NeF2
(iii) XeF2
(iv) XeF6
Answer the following.
List the uses of Neon and argon gases.
Write electronic configuration and two uses of neon. (Z = 10)
Complete the following reactions : XeF6 + 3H2O →
Draw the structures of the following
XeF6
Fill in the blanks by choosing the appropriate word/words from the brackets
(square pyramidal, electrical, 74; 26, sp3d2, sp3d, chemical, 68, 32, tetrahedral, yellow, white, iodoform, Lucas)
The geometry of XeOF4 molecule is ______ and the hybridisation of Xenon atom in the molecule is ________.
In which of the following pairs, the two species are isostructural:
Which of the following reactions is an example of redox reaction?
Match the compounds given in Column I with the hybridisation and shape given in Column II and mark the correct option.
| Column I | Column II |
| (A) XeF6 | (1) sp3d3 – distorted octahedral |
| (B) XeO3 | (2) sp3d2 – square planar |
| (C) XeOF4 | (3) sp3 – pyramidal |
| (D) XeF4 | (4) sp3d2 – square pyramidal |
Substance having the lowest boiling point ______.
The atomic radii of Zr and Hf are almost identical. This is because of
Noble gases are named because of their inertness towards reactivity. Identify an incorrect statement about them.
