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Write the formulae of the following compounds. Also name the elements present in them. 

(a) Water (b) Ammonia (c) Methane (d) Sulphur dioxide (e) Ethanol

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(a). Water- H2O; Elements present are Hydrogen and Oxygen. 

(b).Ammonia- NH3; Elements present are Nitrogen and Hydrogen. 

(c).Methane-CH4; Elements present are Carbon and Hydrogen. 

(d).Sulphur dioxide-SO2; Elements present are Sulphur and Oxygen. 

(e).Ethanol-C2H5OH; Elements present are carbon, hydrogen and oxygen.

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