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Question

Select correct statements.
  1. Helium has the lowest melting point and boiling point
  2. Helium can diffuse through rubber, PVC and even glass
  3. Ar, Kr and Xe form clathrate
  4. All the above are correct statements

A
Ar, Kr and Xe form clathrate
B
Helium has the lowest melting point and boiling point
C
Helium can diffuse through rubber, PVC and even glass
D
All the above are correct statements
Solution
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Crystalline clathrates or inclusion complexes of noble gases have long been known. In these complexes the noble gas atoms are trapped in cavities in the crystal lattice of certain other 'compounds such as quinol or water. The formation of clathrates seems to depend on relative molecular dimensions rather than on any particular chemical affinity. The atoms or molecules of any substance, which are of a suitable size to fit in the cavities in the host lattice, can form clathrates.
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