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classification of matter, earlier attempt of classification,trend in their properties
pragati j binod
it's very nice for all those student who want to gain more knowledge about chemestry..n i am very thankfull to this programme for provide us such a good knowledge it is very usefull for me!thank u very much>>>>
1400 days 21 hours 42 minutes ago
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1491 days 12 hours 23 minutes ago
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