Category: Chemistry

  • Diborane Structure

    Orbital structure of Diborane : Diborane has less number of electrons than required for the formation of normal bonds between the atoms. Thus, diborane is an Electron deficient molecule. Diborane formula is . It is a colorless gas. Diborane structure : In diborane, each Boron atom provides three electrons and each hydrogen atom provides one electron […]

  • Hydrogen as fuel

    Hydrogen as fuel :  The heat of combustion of hydrogen is high  and hence hydrogen is widely used as an industrial fuel. Oxyhydrogen blow torch : When hydrogen is burnt with pure oxygen in oxyhydrogen blow torch a high temperature  flame is obtained. It is used for welding purposes and for melting platinum and quartz. Water gas […]

  • What is Hard Water? Hardness of Water

    What is Hard Water? Hardness of Water

    The hardness of water is the amount of dissolved calcium and magnesium in the water. Hard water is high in dissolved minerals, largely calcium and magnesium. You may have felt the effects of hard water, literally, the last time you washed your hands. Depending on the hardness of your water, after using soap to wash […]

  • Isolation of noble gases

    Isolation of noble gases : Noble gases are present in the air. Isolation of Noble gases mainly occur in two steps. Separation of Noble gas mixture from the air. Separation of different inert gases from one another. Separation of Noble gas mixture from the air : The first step involves the separation of Noble gaseous […]

  • Preparation of water gas

    Preparation of water gas : Water gas is a mixture of carbon monoxide and hydrogen. water gas formula is       Principle : In the preparation of water gas superheated steam is passed over white-hot coke. A mixture of  is obtained. Procedure : The generator is filled with coke. It is provided with coke – inlet at the […]

  • Difference between diamond and graphite

    What is the Difference between diamond and graphite : Diamond and Graphite are the crystalline allotropes of carbon. Difference between diamond and graphite : Diamond Graphite Each carbon is hybridised. Each carbon is  hybridised. Each carbon is bonded to four other carbons tetrahedrally. Each carbon is bonded to 3 other carbon atoms to form hexagonal […]

  • Discovery of Noble Gases

    Discovery of Noble Gases

    The Discovery of Noble gases took place in a period of one century (1795 – 1898). Ramsay and Rayleigh were awarded the Nobel prize for their studies on Noble gases. The noble gases are colorless, odorless, tasteless, and non-flammable gases. Noble Gases List : Helium (He) Neon (Ne) Argon (Ar) Krypton (Kr) Xenon (Xe) Radon […]

  • Preparation of NaOH by Castner Kellner process

    Preparation of NaOH by Castner Kellner process : Castner Kellner process is also called as Mercury cathode process. The chemical formula of Sodium hydroxide is NaOH.  Sodium hydroxide is also known as caustic soda or lye.  The ph value of sodium hydroxide is 12. Principle of Preparation of NaOH : Brine solution is subjected to electrolysis using mercury as cathode.   gas evolves at anode. […]

  • Kinetic molecular theory of gases

    Assumptions of Kinetic molecular theory  of gases :  Gases are composed of minute particles called molecules. All the molecules of a gas are identical. Gaseous molecules are always at a random movement. The molecules are moving in all possible directions in straight lines with very high velocities. They keep on colliding against each other and […]

  • Heavy Water preparation

    Preparation of heavy water : Deuterium oxide  is called heavy water. Preparation of heavy water – “Electrolytic method” : Heavy water can be prepared by the exhaustive electrolysis of water containing alkali according to Taylor, Eyring and Frost process. The process involves seven stages. The electrolytic cell is made of steel which acts as cathode. A cylindrical […]