5.Define

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4.Write the molecular formulae for the oxides and sulphides of the following elements.

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3.The valency of aluminium is 3. Write the valency of other radicals present in the following compounds.

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2.Write the molecular formulae for the following compounds and name the elements present-

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1.Give symbols & valencies of following radicals-

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7.State the law of conservation of mass.

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6.Differentiate between

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