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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 1. Which of the following is valid arithmetic operator in Python? (A) // (B) ? (C) < (D) and 2. Suppose a tuple T is declared as T = (10, 12, 43, 39) which of the following is incorrect? (A) print(T[1]) (B) T[2] = – 29 (C) print(max(T)) (D) print(len(T)) 3. Which of the following is invalid? (A) _a = 1 (B) __a = 1 (C) __str__ = 1 (D) none of the mentioned 4. Which of the following is/are sorting technique? (A) Bubble sort (B) Insertion sort (C) Both A and B (D) None of these 5. To open a file “c:\scores.txt” for reading, we use ......................... . (A) infile = open(“c:\scores.txt”, “r”) (B) infile = open(“c:\\scores.txt”, “r”) (C) infile = open(file = “c:\scores.txt”, “r”) (D) infile = open(file = “c:\\scores.txt”, “r”) 6. All keywords in Python are in ......................... . (A) lower case (B) UPPER CASE (C) Capitalized (D) None of these 7. To read two bytes from a file object infile, we use ............................. . (A) infile.read(2) (B) infile.read() (C...
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Computer science Solutions term 1 || Objective Type Questions MCQS || Objective Answers Class 12 Solution || Computer Science ||

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1 . A function in Python begins with which keyword? (a) void (b) return (c) int (d) def Ans : (d) def 2 . Name the statement that sends back a value from a function. (a) print (b) input (c) return (d) None Ans : (c) return 3 . Functions that do not return any value are known as: (a) fruitful functions (b) void functions (c) library functions (d) user-defined functions Ans : (b) void functions 4 . A variable created or defined within a function body is classified as: (a) local (b) global (c) built-in (d) instance Ans : (a) local 5 . Which of the following arguments works with implicit values that are used if no value is provided? (a) keyword (b) required (c) variable-length (d) default Ans : (d) default 6 . Which values are used by the functions to communicate information back to the caller? (a) local (b) global (c) return (d) random Ans : (c) return 7 . What is the output of the program given below? x = 50 def func (x) :  x = 2 func (x) print ('x is now', x) (a) x is now 50 (b)...
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SOME BASIC CONCEPTS OF CHEMISTRY

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       1. DEVELOPMENT OF CHEMISTRY Chemistry, as we understand it today, is not a very old   discipline. Chemistry was not studied for its own sake, rather   it came up as a result of search for two interesting things: i. Philosopher’s stone (Paras) which would convert  all baser metals e.g., iron and copper into gold. i i.‘E lex i r of life’ which would grant immortality. People in ancient India, already had the knowledge of many   scientific phenomenon much before the advent of modern science. They applied that knowledge in various walks of   life. Chemistry developed mainly in the form of Alchemy   and Iatrochemistry during 1300-1600 CE. Modern   chemistry took shape in the 18th century Europe, after a  f ew centuries of alchemical traditions which were introduced in Europe by the Arabs. Other cultures – especially the Chinese and   the Indian – had their own alchemical traditions. These included much knowledge of ch...
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