Alternating current class 12 key concepts || A C class 12 key concepts || Alternating current formulas class 12 ||

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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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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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Top Headlines in Hindi || 4 June 2022 , Saturday ||

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Changing Trends And Career in Physical Education || Physical education Chapter 1 || Chapter 1 Changing Trends And Career in Physical Education || Physical education || Notes ||

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1. Meaning and Definition of Physical Education Physical Education is composed of two words Physical and Education. ‘Physical’ means body and ‘Education’ means modification of behaviour thus means Education through the medium of physical Activities. It aims on overall development of human being through participating in various games and sports activities. Modern Physical Education was started in 18 century in Germany. Where Physical Education was an integral part of School Curriculum, Since then many changes have taken place and various aspects have emerged with time.  1.1 Definitions of Physical Education: In fact the basis of the physical education is difficult and very broad changing with time, its meaning also kept changing. Following time, its meaning: According to Charles A Bucher, "physical education is an integral sum part of  the total education process and has its aim in the development of physically, mentally, emotionally and socially fit citizens through the med...
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WAVES

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                             1. INTRODUCTION In this topic we will study about the waves. A material medium provides   such an example. Here, elastic forces bind the constituents   to each other and, therefore, the motion of one affects that of   the other. If you drop a little pebble in a pond of still water,   the water surface gets disturbed. The disturbance does not   remain confined to one place, but propagates outward along a circle. If you continue dropping pebbles in the pond, you   see circles rapidly moving outward from the point where the   water surface is disturbed. It gives a feeling as if the water is   moving outward from the point of disturbance. If you put   some cork pieces on the disturbed surface, it is seen that the cork pieces move up and down but do not move away   from the centre of  disturbance. This shows...
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