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{:(,"Column-I",,"Column-II",),((A),"Law ...

`{:(,"Column-I",,"Column-II",),((A),"Law of conservation of mass",(p),CH_(4) "has carbon and hydrogen in" 3:1 "mass raio",),((B),"Law of multiple proportion",(q),10mL N_(2) "combines with" 30mL "of" H_(2) "to form" 20mL "of" NH_(3),),((C),"Law of definite proportion",(r),"S and" O_(2) "combine to form" SO_(2) "and" SO_(3),),((D),"Law of reciprocal proportion",(s),"In" H_(2)S "and" SO_(2) "mass ratio of H and O w.r.t. sulphure is" 1:16 "hence in" H_(2)O "mass ratio of H and O is" 1:8.,),((E),"Gay Lussac's Law",(t),4.2 g MgCO_(3) "gives" 2.0 g "residue on heating",):}`

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Nitrogen and oxygen combine to form N_(2)O , NO and NO_(2) . This is in accordance with law of reciprocal proportions.

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1 mol of SO_(2) and 1 mol of H_(2)S react completely to form H_(2)O and S as follows: SO_(2)+2H_(2)S to 2H_(2)O+3S (At. mass S = 32, O = 16) The mass of S obtained is: