practice questions sci class 9
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Who discovered the frist vaccine and name of the virus from which that vaccine developed and the name of the disease
Who discovered the frist antibiotic and name of that antibiotic
Explain the Thomson model of atom
Explain the Rutherford gold foil experiment
Write the postulates of Dalton atomic theory
Derive of Kinectic energy and potential energy
Explain the Bohrs model of atom with diagram
Calculate the molecular mass of Nacl and H2O
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