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CBSE Notes 2011-2012


Cross Word Puzzle On Sets

Dear Studetns,

Today I am sharing with you a crossword puzzle created with the help of eclipse crossword puzzle maker software. Try to solve this and share your views/ openions on it with me. 

Wish you all the best. 





1. Determine the mass of 6.022 X 1023 number of N2 molecules.
2. Calculate the number of particles in-
(i) 8 g of O2 molecules (ii) 2.5 mol of calcium atoms.
3. What is the mass of 2.5 mol of Methane?
4. Find the mass of one molecule of water.
5. Calculate the number of water molecules and number of oxygen and hydrogen atoms in a drop of water containing 0.03 mol of water.


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CBSE Sample papers for class 9 (IX)

CBSE Sample papers for 2009 are available for you to go through and practice.

You can download the sample papers.

The sample papers give you an idea of the format that can be expected in the actual question paper. They also give you an good idea of how the questions are organized in the various sections and the level of difficulty that you can expect.

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