General form of Ohm’s law: At a constant temperature potential difference across a conductor is directly proportional to the current passing through it V α I V = RI Ohm’s law is material dependent because it is defining resistance of the material. Those which obeys ohm’s law and are known as ohmic or linear conductor, Read more about Ohm’s law[…]
Reaction between two different halogens Types: XX’, XX’3, XX’5 and XX’7 X – Halogen of larger size, more electropositive X’- Halogen of smaller size Preparation: Direct combination. Product depends on the concentrations of the reactants. Cl₂ + F₂ → 2ClF Cl₂ + 3F₂ → 2ClF₃ Properties: Covalent molecules Diamagnetic Volatile solids/liquids {except ClF which is Read more about Interhalogen Compounds[…]
Consider a closed conducting loop ABCD, with the arm CD sliding, placed in a horizontal plane. Let B be a uniform magnetic field perpendicular to the plane of the loop and directed into it. Let the conductor CD be moved towards right with a velocity v as shown in Fig. As the conductor CD slides, Read more about Motional E.M.F[…]
⇒ The oxoacids of sulphur are more numerous and more important than those of Se and Te. ⇒ Many of the oxoacids of sulphur do not exist as free acids, but are known as anions and salts. ⇒ Acids ending in ous have S in the oxidation state (+IV) and form salts in -ite. ⇒ Read more about Oxoacids of Sulphur[…]
The ability of a magnetic field to magnetize a material medium is called its magnetic intensity H. Its magnitude is measured by the number of ampere-turns flowing round unit length of a solenoid, required to produce that magnetic field. Let the field due to a solenoid of n turns per meter length be H = Read more about Magnetic Intensity (H):[…]
Sulfuric acid is produced from sulfur, oxygen and water by contact process. 1. Contact Process: ⇒ Sulfur is burned to produce sulfur dioxide. S (s) + O2 (g) → SO2 (g) ⇒ This is then oxidized to sulfur trioxide using oxygen in the presence of a vanadium oxide catalyst. This reaction is reversible and the formation of the sulfur trioxide is exothermic. So Read more about Sulphuric Acid[…]
LENZ’S Law – The Direction of Induced E.M.F: The direction of the induced e.m.f. is given by the Russian Scientist Lenz. The direction of the induced e.m.f. is such that it opposes the cause producing the change of flux. Induced e.m.f.. This equation is called Faraday’s law of induction or Neumann’s law. The negative sign Read more about LENZ’S Law[…]
⇒ Phosphorus forms a large number of oxoacids. ⇒ All these acids are based on tetrahedral four coordinated phosphorus atom containing at least one P = O unit and one P – OH group. Condensed systems are formed by P – O – P linkage or P – P linkage. ⇒ The basicity depends on the Read more about Oxoacids of Phosphorus[…]
Faraday’s laws of electromagnetic induction-Magnitude of induced e.m.f. Whenever the magnetic flux linked with a closed circuit changes, an e.m.f. is induced in the circuit. The induced e.m.f. lasts so long as the change in flux lasts. The magnitude of the induced e.m.f. is directly proportional to rate of change of flux linkage or rate Read more about Laws of Electromagnetic Induction[…]
Oxides of nitrogen range from N2O (oxidation state of nitrogen +1) through NO, N2O3, NO2, N2O4, N2O5 in which the oxidation state of nitrogen is +5 1. NO2– Nitrogen dioxide: ⇒ NO2 is an intermediate in the industrial synthesis of nitric acid. ⇒ This reddish – brown toxic gas has a characteristic sharp, biting odor and is a prominent air pollutant. It absorbs light and leads to the yellow-brown Read more about Oxides of nitrogen[…]