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The pungent smell of ammonia ( NH3 ) is felt first. This can be explained by Graham's law of diffusion. The rate of diffusion of the gas is inversely proportional to the square root of molecular weights. Therefore, lighter gas diffuses faster than the heavier gas.
q 2 ans
Mercury is used in barometers because of its high density. At 13.9 g/cm^2, mercury is the most dense substance to exist as a liquid at room temperature. By comparison, water has a density of 1.00 g/cm^2.
q 4 ans
Linde's method is based on Joule-Thomson's effect in which when compressed gas is allowed io expand into a region of low pressure, cooling effect is produced. But in case of H and He due to very small size and non-polar nature, they cannot cause such effect that s why these two gases cannot be liquefied by Linde's method.
q 5 ans
use formula "V1/T1 = V2/T2"
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