| One common reagent that can precipitate, react and differentiate the following pairs is |
| i. \[A{{g}^{\oplus }},\,B{{a}^{2+}}\] |
| ii. \[C{{u}^{+2}},P{{b}^{2+}}\] |
A) \[N{{H}_{4}}SCN\]
B) \[{{K}_{2}}Cr{{O}_{4}}\]
C) \[BaC{{l}_{2}}\]
D) \[N{{H}_{4}}CN\]
Correct Answer: B
Solution :
[b] (i) \[2A{{g}^{\oplus }}+Cr{{O}_{4}}^{2-}\xrightarrow{{}}\underset{\operatorname{Re}d\,\,ppt}{\mathop{A{{g}_{2}}Cr{{O}_{4}}}}\,\downarrow \] \[B{{a}^{2+}}+Cr{{O}_{4}}^{2-}\xrightarrow{{}}\underset{Yellow\,\,ppt}{\mathop{BaCr{{O}_{4}}}}\,\downarrow \] (ii) \[C{{u}^{2+}}+Cr{{O}_{4}}^{2-}\xrightarrow{{}}\underset{Chocolate\,\,ppt}{\mathop{CuCr{{O}_{4}}\downarrow }}\,\] \[P{{b}^{+2}}+Cr{{O}_{4}}^{2-}\xrightarrow{{}}\underset{Yellow\,\,ppt}{\mathop{PbCr{{O}_{4}}\downarrow }}\,\]
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