Adhayan chaudhary

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                  Adhayan Chaudhary 

Site- himanshuswiz.blogspot.com (himanshu swiz) 

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Diagonal Relationship between Beryllium and Aluminium || Relation between Beryllium and Aluminium

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  Diagonal Relationship between Beryllium and Aluminium The ionic radius of Beryllium (Be 2+) is estimated to be nearly 31 pm; the charge/radius ratio Or e/m ratio is nearly the same as that of the Al 3+ ion. Hence beryllium resembles aluminium in these ways. Some of the similarities are given below: » Like Aluminium, Beryllium(be) is not readily attacked by acids H+ donor because of the formation of an oxide film on the surface of the metal by reacting with oxygen, i.e. they are rendered passive by nitric acid. » Beryllium hydroxide[[Be(OH)4]2] dissolves in excess of alkali to give a beryllate ion, [ Be(OH)4]2– just as aluminium hydroxide[Al(OH)3] gives aluminate ion, [Al(OH)4] » The chlorides of metals beryllium and aluminium have Cl– bridged chloride structure in vapour phase. Both the chlorides are soluble in organic solvents and are strong as Lewis acids They are used as Friedel Craft catalysts. » Beryllium(Be) and aluminium(Al) ions have strong tendency to form complexes, (Be...
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Math question

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A tower, x metre, has a flagstaff at its top. The tower and flagstaff subtends equal angles at a point distant y metre from the foot of the tower. Then find the length of the flagstaff ( in metre). 
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Banking of road || Inclination of road || Physics || Class 11 ||

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What does one mean by exothermic and endothermic reactions? Give examples.

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Ques 9: What does one mean by exothermic and endothermic reactions? Give examples.   Ans 9: Chemical reactions that release energy in the form of heat, light, or sound are called  exothermic reactions. Example: Mixture of sodium and chlorine to yield table salt.                2 Na + Cl 2  →2 Na Cl In other words, combination reactions are exothermic.  Reactions that require energy or absorb   energy in order to proceed are called endothermic reactions.  For example: In the process of photosynthesis, plants use the energy from the sun to convert carbon dioxide and water to glucose and oxygen .       6  CO 2  + 6  H 2 O  →  C 6 H 12 O 6  + 6  O 2 «« Previous question              Next question »»
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Physics class 12 questions

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 1. A point charge +q, is placed at a distance d from an isolated conducting plane. The field at a point P on the other side of the plane is  (a) directed perpendicular to the plane and away from the plane.  (b) directed perpendicular to the plane but towards the plane.   (c) directed radially away from the point charge.  (d) directed radially towards the point charge.  2. A positively charged particle is released from rest in an uniform electric field. The electric potential energy of the charge  (a) remains constant because the electric field is uniform.  (b) increases because the charge moves along the electric field.  (c) decreases because the charge moves along the electric field.  (d) decreases because the charge moves opposite to the electric field.  3. Which of the following characteristics of electrons determine the current in a conductor?   (a) Drift velocity alone   (b) Thermal velocity alone...
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