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Get Answers to all your Questions
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Which among the following is correct statement?
NaH is thermally more stable than CsH
Density of is about 1/14th of air
Atomic hydrogen is much more reactive than ordinary hydrogen
All of the above
Answers (1)
Hydrides are thermally stable when the size of cation and anion are in the same order. Smaller anions form stable compound with smaller cations. The thermal stability of the hydrides decrease down the groups since the size of the cation increase down the group. Hence, the decreasing order of thermal stability of group
IA hydride is
Hence (1) is correct.
Air is a mixture of several gasses, such as oxygen, nitrogen, argon, and carbon dioxide. The two most dominant presences in air are oxygen and
nitrogen, along with
Argon and carbon dioxide of about
. Weighted average of molecular weight of these gases comes out to
. Which is 14 times more than dihydrogen
. Hence, (2) is correct.
Atomic hydrogen when combine to form a molecule, it releases energy in the form of heat. Which implies atomic hydrogen has excess energy and is unstable & more reactive than normal
. Hence, (3) is correct.
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