Match Column-$I$ and Column-$II$ with the correct relation:
Column-$I$ Column-$II$ $(i).$ Magnesium pyrophosphate $(a).$ $I_2O_5$ $(ii).$ Barium sulphate $(b).$ $AgX$ $(iii).$ Iodide pentoxide $(c).$ $Mg_2P_2O_7$ $(iv).$ Silver halide $(d).$ $BaSO_4$
| Column-$I$ | Column-$II$ |
| $(i).$ Magnesium pyrophosphate | $(a).$ $I_2O_5$ |
| $(ii).$ Barium sulphate | $(b).$ $AgX$ |
| $(iii).$ Iodide pentoxide | $(c).$ $Mg_2P_2O_7$ |
| $(iv).$ Silver halide | $(d).$ $BaSO_4$ |
(C) The correct matches are as follows:
$(i)$ Magnesium pyrophosphate is $Mg_2P_2O_7$ (used in phosphorus estimation).
$(ii)$ Barium sulphate is $BaSO_4$ (used in sulfur estimation).
$(iii)$ Iodide pentoxide is $I_2O_5$ (used in oxygen estimation).
$(iv)$ Silver halide is $AgX$ (used in halogen estimation).
Therefore,the correct sequence is $(i-c, ii-d, iii-a, iv-b)$.
$(i)$ Magnesium pyrophosphate is $Mg_2P_2O_7$ (used in phosphorus estimation).
$(ii)$ Barium sulphate is $BaSO_4$ (used in sulfur estimation).
$(iii)$ Iodide pentoxide is $I_2O_5$ (used in oxygen estimation).
$(iv)$ Silver halide is $AgX$ (used in halogen estimation).
Therefore,the correct sequence is $(i-c, ii-d, iii-a, iv-b)$.
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