Shailesh Koirala 
DNA contains a code which dictates the sequence in which amino acids are to be linked together to make a protein. The sequence of bases in a gene is a code for the sequence of amino acids in a protein. This relationship of nucleotide bases of a gene and the amino acids is known as … Read more
Liver performs a number of functions. Due to its function, it is also called master laboratory of the body. It is an important organ for metabolism in vertebrates. A summary of its important function is as follows: 1) Secretion of bile The liver cells synthesize the constituents of bile from the mixed arterial and venous … Read more
S.N Name Oxidation number of N Physical appearance Uses 1. Nitrous oxide (N2O)/laughing gas +1 colourless gas neutral non-irritating sweet smelling 1. used as local anaethesia and analgesics for small surgical operation. 2. fuel additive in car racing 3. helps in … Read more
When the reactants of a chemical reaction are completely reacted to form products, then the heat evolved or absorbed is called the heat of reactions. Heat of reactions are of various types depending upon the nature of reaction. It must be defined for one mole. The various types of heat of reactions are as follows: … Read more
A binary compound of oxygen with another element is known as an oxide. There are various types of oxides. They are as follows: A) Basic oxides: It is formed with alkali metals, alkaline earth metals (except Be) and transition metals generally. These oxides give bases with water. These oxides react with acids to form salt … Read more
S.N Oxidizing agent Reducing agent 1. Almost all non-metals like O2, F2, and Cl2 are oxidizing agents. All the metals like Na, K, Ca, Mg and some non-metals like C, H, P and S are reducing agents. 2. All the oxides like SO2, SO3, CO3, CaO, FeO, etc. All the hydrides like NaH, H2S, and … Read more
S.N NH3 PH3 1. It is lighter than air. It is heavier than air. 2. It is not poisonous. It is highly poisonous. 3. It forms H-bonding. It does not form H-bonding. 4. It is highly soluble in water. It is sparingly soluble in water. 5. Its aqueous solution is alkaline. Its aqueous … Read more
A) The electronic configuration(EC) The EC of alkali metal is ns1. They have single electron in their outer most shell. Therefore, their valency is also one. They have a great tendency of losing electron from their outermost orbit. Due to the above reason, they are considered to be the most electropositive elements. For example: Na … Read more
S.N Properties White phosphorous Red phosphorous 1. Colour Light yellow Red 2. Smell Light garlic Smelless 3. Physiology Poisonous Non-poisonous 4. Conductivity Bad conductor Semiconductor 5. Density 1.81 g/cm3 2.1 g/cm3 6. Melting point 44ºc 500ºc 7. Ignition temperature 30ºc 240ºc 8. Phosphorescence Glows up in dark Does not glow in dark 9. Solubility in … Read more
S.N Common name Chemical formula 1. Asbestos CaSiO3.3MgSiO3 2. Alabaster or Gypsum CaSO4.2H2O 3. Anhydrone Mg(ClO4)2 4. Barytes BaSO4 5. Baryta solution Ba(OH)2 6. Baryta BaO 7. Baking soda NaHCO3 8. Bleaching powder CaOCl2 9. Brine NaCl (25-30% aq.soln) 10. Brucite Mg(OH)2 11. Baeyer’s reagent KOH + KMnO4 12. Blue vitriol CuSO4.5H2O 13. Calgon (Graham … Read more