Sadi Notes : Maths

notes for 9th class of science subject except computer

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TEST YOURSELF 2.1 Chemistry 9th Chapter 2

TEST YOURSELF 2.1 (1) Do you know any element having no neutrons in its atom? Hydrogen atom has no neutron but in its isotopes lik...
TEST YOURSELF 2.2 Chemistry 9th Chapter 2

TEST YOURSELF 2.2 (1) How was it proved that the whole mass of an atom is located at its centre? Ans . Since most of the alpha pa...
TEST YOURSELF 1.7 Chemistry 9th Chapter 1

TEST YOURSELF 1.7 (1) How many atoms of Sodium are present in 3 moles of Sodium and what is the mass of it ? Given data : No of mo...

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TEST YOURSELF 2.4 Chemistry 9th Chapter 2

TEST YOURSELF 2.4 1. Why do the isotopes of an element have different atomic masses? muhamma...

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