1.

An excess of Na_(2)S_(2)O_(3) react with aqueous CuSO_(4) to give

Answer»

`CuS_2O_3`
`Cu_2S_2O_3`
`Na_2[CU(S_2O_3)_2]`
`Na_4[Cu_6(S_2O_3)_5]`

ANSWER :D


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