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Chemical Formulas

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                  CHEMICAL FORMULAS The chemical formula of a compound is a symbolic representation of its chemical composition. Name of the Compound           Formula Sodium hydroxide                    NaOH Phosphorus pentachloride     PCl 5 Sulfur dioxide                           SO 2 Potassium bicarbonate           KHCO 3 Methanol                                   CH 3 OH Ammonium Carbonate             (NH 4 ) 2 CO 3 Aluminium Oxide                      Al 2 O 3 Sodium oxide                            Na 2 O Aluminium Carbonate              Al 2 (CO 3 ) 3 Acetic acid                                CH 3 COOH Aluminium Chloride                 AlCl 3 Sodium sulphate                      Na 2 SO 4 Benzene                                     C 6 H 6 Sodium carbonate                    Na 2 CO 3 Acetone                                      C 3 H 6 O Barium Chloride                        BaCl 2 Carbon tetrachloride                CCl 4 Barium hydroxide                     
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Science Class 10th PYQs and Practice Questions for Board Exams

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  Science PYQs and IMP Qs        Class 10th Science PYQs and Practice              Questions for Board Exams 2023- 2024                         ayushagarwal_maths                     MCQs                  Q.1 . Light of which of the following colour is scattered least ?  (a) Violet  (b) Red (c) Blue  (d) Yellow  Ans. (b) Red  Q.2. In an electrolysis of water, if the mass of the gas collected at the anode is mₐ and the mass of the gas collected at the cathode is mc the value of (mc/mₐ) is :  (a) 8  (b) 16  (c) 1/16  (d) 1/8  Ans. (d) 1/8 Q.3. The unit of electric energy is :  (a) kilowatt  (b) kilowatt-hour  (c) watt  (d) kilowatt per hour  Ans.   (b) kilowatt-hour  Q.4. The average weight of an adult human brain is :  (a) 1200 g  (b) 1350g  (c) 1450 g  (d) 1500 g  Ans. (b) 1350 g  Q.5. In which life processes we take energy from food ?  (a) Nutrition (b) Excretion  (c) Circulation (d) All of these  Ans. (a) Nutrition Q.6. Why do estrogen levels fall after menopause ?  (a) Cells of
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square numbers maths

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          SQUARES AND SQUARE ROOTS   Square number - The square of a number is the product of the number with the number itself.  A given number is a perfect square if its prime factors can be expressed in pairs of equal factors.  A perfect square number is never negative. For example - 8^2 = (8×8) = 64 Facts About Squares -  1. A number ending in 2, 3, 7 or 8 is never a perfect square.  2. A number ending in an odd number of zeros is never a perfect square.  3. The square of an even number is always even.  4. The square of an odd number is always odd.  5. The ending digits of a square number is 0, 1, 4, 5, 6, or 9 only.  Note:- It is not necessary that all numbers ending with digits 0, 1, 4, 5, 6, or 9 are square numbers.  Important Facts-  1. Numbers ending in an even number of zeros are not necessarily perfect squares. Eg- 3700, 290000, 47000000.   Practice Questions :-  1. Find the square of 54 ?  2. What least number must be added to 5607 to mak
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