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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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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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