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Q. Extraction of f-block element ? As all the lanthanides occur together in nature, their extraction involves two main steps: (i) separation from one another and (ii) reducti
Silicon has 4 electrons in the outermost orbit. In forming the bonds: (1) It gains electrons (2) It loses electrons (3) It shares electrons (4) None of these Ans: I
describe iron exchange process
Solubility of urea
Consider 1:1 stoichiometric polymerisation of 1,4-diaminobutane with sebacoyl chloride. (a) Write down a balanced chemical equation for the polymerization (b) Name the polyme
1.sheilding & de-sheilding 2.magnetic anisotropy 3.hydrogen bonding
Which of the following is not true in Rutherford's nuclear model of atom: (1) Protons and neutrons are present inside nucleus (2) Volume of nucleus is very small as compared
475 ml at 54 psi to 1760 torr
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Acetic acid has less conductivity, due to it ionizes less in solution. HCl divides almost completely in solution to form the ions Cl- and H+..
Colloids are classified as two types which are the lyophilic / reversible and lyophobic / irreversible. If water is the dispersion medium, then the term used are hydrophilic and hydrophobic.Lyophilic colloids: A colloidal system which may be constructed readily by simple warming or shaking the substance in a suitable solvent is called as lyophilic colloid. Substances that form lyophilic colloids involves gelatin, starch, and rubber, proteins, gum. Lyophilic colloids are also named as reversible colloids as on evaporating the dispersion medium such as water, the substance or the residue may be again reconverted into colloidal state simply by addition of the liquid i.e. water. These solutions are reasonably stable and usually cannot be easily precipitated.Lyophobic colloids: colloids constructed with difficulty are termed as lyophobic colloids. These colloids are constructed by substances such as As2S3 , Fe(OH)3, gold and other metals that are sparingly soluble and thus their molecules do not pass readily into colloidal state. Lyophobic colloids are called as irreversible colloids since the residue cannot readily be reconverted into sol by ordinary means. These solutions are quite readily precipitated and hence they are not stable.
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