Among the following pairs of compounds

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Problem

Among the following pairs of compounds, the one that illustrates the law of multiple proportions is NH3NH_3 & NCl3NCl_3 H2SH_2S & SO2SO_2 CuOCuO & Cu2OCu_2O CS2CS_2 & FeSO4FeSO_4 (1) NH3NH_3 & NCl3NCl_3 (2) H2SH_2S & SO2SO_2 (3) CuOCuO & Cu2OCu_2O (4) CS2CS_2 & FeSO4FeSO_4

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