CBSE ADDA

Mole Concept we can express the quantity of a substance is expressed in terms of mole. Mole is a fundamental unit in the System International d' Unités, the SI system, and it is used to measure the amount of substance In Latin mole means a "massive heap" of material Mole is defined as the amount of substance that contains as many specified elementary particles as the number of atoms in 12g of carbon-12 isotope . One mole is also defined as the amount of substance which contains Avogadro number (6.023 x 1023) of particles. Avogadro number: Number of atoms or molecules or ions present in one mole of a substance is called Avogadro number. Its value is 6.023 x 10 23 Therefore, one mole of any substance contains Avogadro number of particles. The particles may be atoms, molecules, ions etc E.g. 1 mole of oxygen atoms = 6.023 x 10 23 atoms, molecules, ions etc  of oxygen                                                = 32g of O 2 Problems (based on m

chemistry adda: Electronic Configurations of elements in periodic ... : 1 - Hydrogen: 1s1 2 - Helium: 1s2 3 – Lithium: [He], 2s1 4 – Beryllium: [He], 2s2 5 – Boron: [He], 2s2, 2p1 6 – Carbon: [He], 2s2,...

Chemical and chemical reaction Acid Base and Salts Metals and Non Metals Periodic Classification of Elements For more  http://jsuniltutorial.weebly.com/science1.html

Trigonometric Ratios of 30 0 and 60 0 Let D ABC be an equilateral triangle whose sides have length a Draw AD ^ BC, then D bisects the side BC. So, BD =  DC=  a/2 and < BAD = < DAC = 30 0 . Now,  in right triangle ADB, < BAD = 30 0 and BD=  a/2 So, AB 2 =   AD 2 +  BD 2 a 2   = AD 2 + (a/2) 2 AD  = √ 3/2 a   Hence, we can find the trigonometric ratios of angle 30 0 from the right triangle BAD

The word trigonometry is a derivation from the Greek language and means measurement of triangles. Hipparchus , a Greek astronomer and mathematician developed the subject trigonometry.  The first trigonometric table was compiled by him. He is now known as “the Father of Trigonometry”. The side that is opposite to the right angle is called the Hypotenuse . This is the longest side in a right triangle. The side that is opposite to the angle i is called the Opposite sid e.

Q. What are macro nutrient and micro nutrients? Elements which are needed in large quantities for growth of the plants are called Macro Nutrients. They are Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorous, Sulphur, Potassium, Calcium, Magnesium and Iron. Elements which are needed by the plants in very small quantities are called Micro Nutrients. They are Manganese, Copper, Molybdenum, Zinc, Boron and Chlorine. Q. What is manure ? Manure is an organic substance and is prepared by the decomposition of plant and animal wastes Based on the kind of biological materials used, manure can be classified as,      i) Compost & Vermi Compost     ii) Green Manure Compost prepared by using earth worms to speed up the process of decomposition of plant and animal wastes is called Vermi Compost. Leguminous plants like Sunn-hemp or Cluster Bean are grown and then mulched by ploughing them back into the soil is called Green Manure Q. What are the differences between Manures and F

Posts with label 10th Carbon and its Compounds Solved X science Carbon and its compound Solved Important questions Carbon and its Compounds Study Notes Carbon and its compounds ETHANOIC ACID CBSE  Subject  Notes 10th NCERT SOLUTION Carbon and its Compounds Carbon and its compounds CBSE Solved Test Paper Chemistry X  Solved  | Carbon and its Compounds | Short type  Q uestions IUPAC Rules for Naming Hydrocarbons CBSE  chemistry class 10 Carbon and its Compounds  ( Video ) Carbon and its Compounds class 10 CBSE | NCERT Solutions X Chemistry: Carbon and its compound Solved Important Questions Practice Paper Unsolved CBSE Guide 2012CHEM- X Assignment -carbon Compounds CBSE Guide 2012CHEM- X Assignment -carbon Compounds Guess Paper – 2012 Class – X  Chapter: Carbon and its compounds X chemistry Carbon and its Compounds Sample guess questions paper Assignment-FA3  For  Chapter: carbon and its compounds Assignment-  for Quick preparati

The question paper is divided into four sections: Section A: Reading Comprehension 15 marks Section B: Writing 15 marks Section C: Grammar 15 marks Section D: Literature 35 marks Marks are indicated against each question. SECTION A (Reading-15 Marks) Q.1. Read the passage given below and answer the questions that follow by writing the options that you consider the most appropriate in your answer sheet.                                                             (5 Marks) Imagine 100 people walking on a beach in the middle of the night, stopping every once in a while to search for turtle eggs and hatchlings! I was a part of this walk recently in the heart of Chennai in Tamil Nadu! Our aim was to take them to the safety of a ‘hatchery’.

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THE TRIBUTE 1. Babuli’s journey to his village was a journey to his past. Elucidate. 2. “Mother was not to been seen anywhere at the vicinity.” Comment upon the helplessness of the mother. 3. Babuli’s wife was already waiting for this event to take place. In the light of her behaviour bring out the materialistic greed taking precedence over familial ties. 4. Though Babuli had not been visiting home, but the news of partition made him feel orphaned. Comment upon the hidden fears that Babuli had. 5. Nowadays people are more inclined towards nuclear families than joint families. Comment upon the ‘I, me, mine’ attitude predominant among the present day youth. 6. Compare and contrast the responses of Babuli and his middle brother to the division of family property. CUTIE PIE 1. Media’s nature of sensationalizing small and big issues has been highlighted in the story. Giving references from the lesson explain the statement. 2. Although Cutie Pie is an alien

1. Do you think Caeser’s death can be attributed to his failure to reads the omens properly or do the omens merely presage the inevitable? 2. How does Caesar continue to wield power over events even after his death? 3. The play ‘Julius Caesar’ focusses on the struggle between powerful individuals. What role do the plebians play in this struggle? 4. Who is the protagonist of the play- Caesar, who dies well before the end but whose power and name continue on or Brutus, the noble man, who falls because of his flaws? 5. Is rigidity and inflexibility of character an admirable trait or a flaw? Discuss Caeser and Brutus in light of the above statement. 6. The spoken word carries more weight. Discuss with reference to speeches of Brutus and Antony 7.What was Calpurnia’s plea? How did Caesar take it? 8. Was Caesar adamant in not responding to his wife’s plea? 9.Caesar wanted to go forth, come what may. Which aspect of his personality you find here? 10. What was

1. Nationalism in Europe and India Compare the policies and methods used by Otto von Bismarck and Sardar Vallabhai Patel in unification of Germany and integration of States of India respectively. The report should include :- Condition of Germany before 1871 (unification) Condition of India immediately after 1947 Why the need for unification in both the places Emergence of Bismarck and Sardar Patel, their brief life history Their role in unification and integration. Similarities and differences between the methods adopted by the two leaders How did the unification affect the growth of the respective countries. You may refer to the following websites: http://www.cyberessays.com/History/73.ht... http://www.cyberessays.com/History/73.ht... http://www1.bartleby.com/65/bi/BismarckO... http://en.wikipedia.org/wiki/Political_i... Books : Any European History book on 19th century and Integration of States by V.P. Menon 2. Evolution and significan

1. ABC is right angled at A. The value of tan B . tan C is _______ (a) tan B                      (b) tan C                     (c) 0                            (d) 1 2. If the mean of 2, 4, 6, 8, 10, x, 14, 16 is 9 then the value of x is (a) 10                           (b) 11                           (c) 12                           (d) 13 3. The relationship in mean, median and mode is (a) Mode = 2 median – 3 mean                      (b) Mode = 2 median - mean (c) Mode = 3 median + 2 mean                       (d) Mode = 3 median – 2 mean 4. If x = tan 2° · tan 36° · tan 54° · tan 88° then the value of x is ______ (a) 45°                                     (b) 1                             (c) 2                             (d) 90° 5. Which of these numbers always ends with the digit 6? Where n is a natural number. (a) 4 n                            (b) 2 n                           (c) 6 n                           (d) 8 n 6. For a pair to be c