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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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AC GENERATOR

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                                         AC GENERATOR  The Phenomenon of electromagnetic induction has been technologically exploited in many ways. An exceptionally important application is the generation of alternating currents (AC). ~ BASIC DESIGN  The basic elements of an ac generator are shown in Figure.  • It consists of a coil mounted on a rotor shaft.  • The axis of rotation of the coil is perpendicular to the direction of the magnetic field.  • The coil (called armature) is mechanically rotated in the uniform magnetic field by some external means.  • The rotation of the coil causes the magnetic flux through it to change, so an emf is induced in the coil.  • The ends of the coil are connected to an external circuit by means of slip rings and brushes.   PRINCIPLE  One method to induce an emf or current in a loop is through a change i...
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OSCILLATIONS

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                            1. INTRODUCTION You have already learnt about some of them, e.g., rectilinear   motion and motion of a projectile. Both these motions are   non-repetitive. We have also learnt about uniform circular   motion and orbital motion of planets in the solar system. In   these cases, the motion is repeated after a certain interval of   time, that is, it is periodic. In your childhood, you must have   enjoyed rocking in a cradle or swinging on a swing. Both   these motions are repetitive in nature but different from the   periodic motion of a planet. Here, the object moves to and fro   about a mean position. The pendulum of a wall clock executes   a similar motion. Examples of such periodic to and fro   motion abound: a boat tossing up and down in a river, the   piston in a steam engine going back and forth, etc. Such a   mo...
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THE p-BLOCK ELEMENTS

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           1. Introduction   In p-block elements the last electron enters the outermost p orbital. As we know that the number of p orbitals is three  and, therefore, the maximum number of electrons that can be accommodated in a set of p orbitals is six. Consequently there are six groups of p–block elements in the periodic table numbering from 13 to 18. Boron, carbon, nitrogen, oxygen, fluorine and helium head the groups. Their valence shell electronic configuration is n s² np¹-6(except for He). The inner core of the electronic configuration may, however, differ. The difference in inner core of elements greatly influences their physical properties (such as atomic and ionic radii, ionisation enthalpy, etc.) as well as chemical  properties. Consequently, a lot of variation in properties of elements in a group of p-block is observed. The maximum oxidation state shown by a p-block element is equal to the total number of valence electrons (i.e.,...
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Computer science MCQ questions Class 12 Python

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 SECTION-A 1. When reading a file line by line, the exact contents can be printed by: (A) Using readline ( ) (B) Using readlines ( ) (C) Using ‘,’ after every print statement (D) Both (A) & (B) 2. Choose the correct Python expression for the following mathematical expressions p+q/(r+s)4 (A) p+q / math.pow ((r+s), 4) (B) p+q/(r+s)^4 (C) p+q / math.pow (r+s,4) (D) (p+q) / math.pow (r+s) 3. Identify the correct statement for opening text file data.txt in total folder of c:drive in read mode. (A) F = open (“c:\\total\\data.txt”, “r”) (B) F = open (“c:\total\data.txt”, r) (C) F = open (“c:\total\data.txt”) (D) F = open (“\total\data.txt”, “r”) 4. A valid combination of atoms and operators forms a Python (A) Statement (B) Expression (C) Condition (D) None of these. 5. The default file open mode in Python is (A) Write (B) Read (C) Append (D) Read/write 6. In Python, a block is executed in an .................... (A) Function (B) Module (C) Py file (D) Execution frame 7. Consider ...
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