Butane, or C₄H_10, has two structural isomers called normal butane, or unbranched butane, and isobutane, or i-butane. According to IUPAC nomenclature, these isomers are called simply butane and 2-methylpropane.

Isomers are molecules with the same molecular formula but different chemical structures. In the case of butane, its two isomers will have these structural formula are:

Butanone or Methyl Ethyl Ketone is a dialkyl ketone which consists of 4 carbon ketone that carries a single keto group at the C-2 position. It is an organic compound with the formula CH₃C(O)CH₂CH_3.

Vermicomposting is the scientific method of making compost. Earthworms which are commonly found living in soil, feed on biomass and excreting it in a digested form.

It is also known as worm-farming. Earthworms feed on organic waste materials to produce vermicasts. It is rich in nitrates and minerals such as phosphorus, magnesium, calcium and potassium. These are used as fertilisers and enhance soil quality.

Lime juice does not show Tyndall effect because lime juice is a true solution. Their particle size is extremely small to scatter light. So they do not show the Tyndall effect. Whereas Starch solution, few drops of milk mixed with water and Chalk powder freshly mixed with water are colloids and will show the Tyndall effect.

A colloid is the kind of solution in which the size of solute particles is intermediate between those in true solutions and those in suspensions. A colloid is not a true solution. The scattering of light by the colloidal particle is known as the Tyndall effect. The scattering of light by the colloidal solutions tells us that the colloidal particles are much bigger than the particles of a true solution. The true solution doesn’t scatter a beam of light passing through it, but a colloidal solutions scatters a beam of light passing through it. Colloids are heterogeneous in nature though they appear to be homogeneous.

Aluminium is extracted from Bauxite.

Iron is extracted from Magnetite.

Copper is extracted from Malachite.

Zinc is extracted from Calamine.

Here are some valuable ores of Aluminum, Iron, Copper and Zinc:

Aluminium: Bauxite, Corundum, Feldspar, Cryolite

Iron: Magnetite, Siderite, Haematite

Copper: Cuprite, Copper glance, Copper pyrites, Chalcocite, Malachite

Zinc: Zinc blende, Zinkite, Calamine, Ferulinite