N.C.E.R.T. Simplified

Q. Define the following terms: a. Malleability  b. Ductility  c. Sonority d. Reactivity series . d. Dilute nitric acid (dil. HNO₃) is a strong oxidizing agent and so it oxidizes the hydrogen gas produced to water i.e. H₂→H₂O and itself gets reduced to any of the nitrogen oxides. .   e.  Copper is the most ductile metal after gold and silver i.e. it can be easily drawn into wires. Also, copper is a good conductor of electricity. f.  Sodium (Na) tends to react vigorously with atmosphere oxygen and catch fire when exposed to air. Thus, in order to cut the supply of air and avoid accidental fires it is stored under kerosene. g.  Platinum, gold and silver are lustrous metals and also the least reactive elements so they do not react with oxygen even at high temperatures and thus they are used to make jewelry. h.  Aluminium is used to make cooking utensils since it develops a protective coating of aluminum oxide when exposed to air which p...

Q. Which non-metal exists in liquid state? A. Bromine Q. What is a covalent bond? A. A covalent bond is a bond formed by sharing of electrons between two atoms to get a stable electron arrangement. e.g. O₂, H₂O, C₂H₄ etc. Q. What type of bonds are present in hydrogen chloride and oxygen? A. Covalent bonds   Q. What is an ionic bond? A. An ionic bond is a bond formed by the transfer of electrons from one atom to another. e.g. NaCl, FeSO₄, MgCl₂ etc. Q. a) What are noble gases? What is the characteristic of the electronic configuration of noble gases? b) What is the cause of chemical bonding (/combination) of atoms of elements? A. a)   The elements present in the group 18 of the periodic table are known as noble gases. These are the elements which are unreactive and do not react with other elements to form compounds.  The characteristic of electronic configuration of noble gases is that their octet (/duplet) is completely filled i.e. they have 8 ...