Hydrogen Test - 7

Only Chromium (Cr)  who belongs to group 6 forms hydride.

Elements of group 7, 8, 9 of d – block do not form hydrides at all. This inability of metal, of group 7, 8, 9 of periodic table to form hydrides is referred to as hydride gap of d – block.

I^- gets oxidize to I₂ in presence H₂O₂ which itself get reduce to H₂O.

I_{​​​​​​2} gets reduce to I^{​​​​​​-} while H₂O₂​​​ get oxidize to O_{​​​​​​2}

Because it can undergo bond dissociation randomly in presence of light. It dissociates and generates free radicals which is very reactive and acts like bleaching agent.

H⁺ cannot exist freely due to its small size.

Water gas is a combustion fuel containing carbon monoxide (CO) and hydrogen gas (H₂). Water gas is made by passing steam over heated hydrocarbons.

The water-gas shift reaction can be used to reduce carbon dioxide levels and enrich hydrogen content, making water gas.

Heavy water is used in certain types of nuclear reactors, where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium-238, which captures neutrons without fissioning.

Hydrogen has three naturally occurring isotopes: protium, deuterium and tritium. Each isotope has different chemical properties.

Protium is the most prevalent hydrogen isotope, with an abundance of 99.98%. It consists of one proton and one electron. It is typically not found in its monoatomic form, but bonded with itself (H₂) or other elements.

When water freezes, water molecules form a crystalline structure maintained by hydrogen bonding. Solid water, or ice, is less dense than liquid water. Ice is less dense than water because the orientation of hydrogen bonds causes molecules to push farther apart, which lowers the density.

Permanent hardness in water is hardness due to the presence of the chlorides, nitrates and sulphates of calcium and magnesium, which will not be precipitated by boiling.Water can be softened using washing soda or an ion-exchange resin.