Dry air mainly contains gases like nitrogen and oxygen along with small proportions of the other gases. The wet air on the other hand, also contains a small amount of water vapours. Now, vapour density of water vapours is less than that of nitrogen and oxygen because molar mass of H2O (18) is less than that of N2 (28) and O2 (32). This means that heavier molecules or nitrogen and oxygen have been replaced by lighter molecules of water vapours when the dry air changes to we air. Therefore, dry air is heavier than wet air.
Thursday, September 24, 2020
Can we apply Dalton’s law of partial pressure to a mixture of carbon monoxide and oxygen?
No, the law cannot be applied because these gases readily combine to form carbon dioxide. The law can be applied only to the non reacting gases.
Why a bottle of liquid ammonia is cooled before opening the seal?
If the seal is opened without cooling, the liquid ammonia suddenly vaporises and gushes out of the bottle with force. This may lead to serious accidents.
Explain , Aerated water bottles are kept under water during summer why?
Aerated water contains CO2 dissolved in water. The solubility of gas decreases with rise in temperature. Thus, amount of free gas in bottle can increase in summer, which may result into increase in pressure and ultimately explosion. To avoid this they are kept under cold water.
Arrange the following in the increasing order of melting point of different types of crystalline solid (i) Covalent solid (ii) Metallic solid (iii) Molecular (iv) Ionic
Covalent > Ionic > Metallic > Molecular (∼ 4000 K) (∼ 1000 K) (880 -1000 K) (273- 600 K)
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